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Toward Full Zigzag-Edged Nanographenes: peri-Tetracene and Its Corresponding Circumanthracene
Published on May 8, 2018
Story of peri-acene (n-PA) molecules started one century ago. Apart from perylene (R. Scholl, 1910) and bisanthene (E. Clar, 1948), all n-PAs are theoretically predicted to show singlet biradical ground
state (open-shell), and, hence unstable under ambient conditions. After several decades of waiting, recently, researchers from Technische Universität Dresden (Chair for Molecular Functional Materials, cfaed)
and collaborators tackle the synthetic challenges to realize peri-tetracene (4-PA), the next higher analogue, in solution via steric-protection of its active zigzag edges.
References: M. R. Ajayakumar, Y. Fu, J. Ma, F. Hennersdorf, H. Komber, J. J. Weigand, A. Alfonsov, A. A. Popov, R. Berger, J. Liu, K. Müllen, X. Feng, J. Am. Chem. Soc., 2018, DOI: 10.1021/jacs.8b03711).
New understanding on graphite: a high power cathode material
Published on April 24, 2018
As conventional Li-ion batteries are approaching the bottleneck of energy and power limit, new energy storage technologies with fast-charging feature but based on low-cost materials are highly desirable for
future sustainable and scalable applications. To construct next-generation quick-charge batteries, the key lies at developing high power cathodes. However, conventional strategies heavily relied on
nanoengineering approaches sacrificing the scalability and battery cost.
Reference: Title: Self-activating, capacitive anion intercalation enables high-power graphite cathodes. Adv. Mater., 2018, 1800533.
Copper-surface-mediated synthesis of acetylenic carbon-rich nanofibers for active metal-free photocathodes
Published on March 23, 2018
Researches from the Chair for Molecular Functional Materials of Prof. Xinliang Feng, and other research groups in Germany, China and Italy have recently published a paper in Nature Communications on
19th March 2018, titled “Copper-surface-mediated synthesis of acetylenic carbon-rich nanofibers for active metal-free photocathodes”.
This work reported a facile and scalable approach for the synthesis of acetylenic carbon-rich nanofibers (i.e. polytriethynylbenzene, PTEB) via Cu-surface mediated Glaser polycondensation.
The as-prepared PTEB nanofibers on conductive substrates can be directly utilized as metal-free photocathodes in photoelectrochemical cells (PECs) for hydrogen production, and the photocurrent
can be increased through the introduction of thienothiophene segment into the PTEB nanofibers. This work highlights the promise of utilizing acetylenic carbon-rich materials as efficient and
sustainable photocathodes for hydrogen production.
Reference: “Copper-surface-mediated synthesis of acetylenic carbon-rich nanofibers for active metal-free photocathodes”. Tao Zhang, Yang Hou, Volodymyr Dzhagan, Zhongquan Liao, Guoliang Chai, Markus Löffler, Davide Olianas, Alberto Milani, Shunqi Xu, Matteo Tommasini, Dietrich R.T. Zahn, Zhikun Zheng, Ehrenfried Zschech, Rainer Jordan & Xinliang Feng. Nat. Commun., 2018, 9, 1140. Doi: 10.1038/s41467-018-03444-0
This work was financially supported by the ERC Grant 2DMATER, ESF Young Researcher Group ‘GRAPHD,’ and the EC under the Graphene Flagship (number CNECTICT-604391). The German Excellence Initiative via the Cluster of Excellence EXC1056 “Center for Advancing Electronics Dresden” (cfaed) is gratefully acknowledged.
A Delamination Strategy for Thinly Layered Defect-Free High-Mobility Black Phosphorus Flakes
Published on March 23, 2018
Extraordinary electronic and photonic features render black phosphorus (BP) an important material for the development of novel electronics and optoelectronics. Despite recent progress in the preparation of
thinly layered BP flakes, scalable synthesis of large-size, defect-free BP flakes remains a major challenge. An electrochemical delamination strategy is demonstrated that involves intercalation of diverse
cations in non-aqueous electrolytes, thereby peeling off bulk BP crystals into defect-free flakes comprising only a few layers. The interplay between tetra-n-butylammonium cations and bisulfate anions promotes
a high exfoliation yield up to 78 % and large BP flakes up to 20.6 µm. Bottom-gate and bottom-contact field-effect transistors, comprising single BP flakes only a few layers thick, exhibit a high hole mobility
of 252±18 cm2V-1s-1 and a remarkable on/off ratio of (1.2±0.15)×105 at 143 K under vacuum, comparable with the electronic properties of mechanically exfoliated BP flakes. This efficient and scalable delamination
method opens new opportunities for the development of BP-based composites and optoelectronic devices. The related work has published in Angew. Chem. Int. Ed.
Reference: Sheng Yang, Ke Zhang, Antonio Gaetano Ricciardulli, Panpan Zhang, Zhongquan Liao, Martin R. Lohe, Ehrenfried Zschech, Paul W. M. Blom, Wojciech Pisula, Klaus Müllen* and Xinliang Feng*, Angew. Chem. Int. Ed, 2018, DOI: 10.1002/anie.201801265
This work is financially supported by ERC grants on 2DMATER, Graphene Core 1 and EC under Graphene Flagship (NO. CNECT-ICT-604391) and Center for Advancing Electronics Dresden (cfaed).
Graphene 2018 will take place in Dresden
Published on January 12, 2018
Prof. Xinliang Feng is one of the co-organizers of the Graphene 2018 conference which will take place in Dresden (Germany) from June 26 – June 29, 2018.
The 8th edition of Graphene Conference series is the largest European Event in Graphene and 2D Materials.
Exploration of pyrazine-embedded antiaromatic polycyclic hydrocarbons generated by solution and on-surface azomethine ylide homocoupling
Published on December 12, 2017
Researches from the Chair for Molecular Functional Materials of Prof. Xinliang Feng at Dresden University of Technology, Max-Planck Institute for Polymer Research Mainz, Technical University of Munich and
Linköping University, recently, explored an unprecedented way of doping Graphene by incorporating antiaromatic units in the basal plane.
In the joint publication “Exploration of pyrazine-embedded antiaromatic polycyclic hydrocarbons generated by solution and on-surface azomethine ylide homocoupling” in Nature Communications, Xiao-Ye Wang,
Marcus Richter, Yuanqin He, Jonas Björk, Alexander Riss et al. (all authors contributed equally) demonstrated azomethine ylide homocoupling as a strategy to synthesize non-planar polycyclic aromatic
hydrocarbons in solution and planar nanographenes on surfaces, embeding a central pyrazine ring. The antiaromaticity of the central pyrazine ring is indicated by optical absorption spectroscopy in conjunction
with theoretical calculations. This strategy opens up methods for chemically tailoring graphene and nanographenes, modified by antiaromatic dopants.
Reference: “Exploration of pyrazine-embedded antiaromatic polycyclic hydrocarbons generated by solution and on-surface azomethine ylide homocoupling”. Xiao-Ye Wang, Marcus Richter, Yuanqin He, Jonas Björk, Alexander Riss, Raju Rajesh, Manuela Garnica, Felix Hennersdorf, Jan J. Weigand, Akimitsu Narita, Reinhard Berger, Xinliang Feng, Willi Auwärter, Johannes V. Barth, Carlos-Andres Palma, Klaus Müllen, Nat. Commun., 2017, 8, 1948.
C.-A.P. was supported from the European Union’s Horizon 2020 research and innovation program 2D ink (no. 664878). X.-Y.W. is grateful to a fellowship from the Alexander von Humboldt Foundation. R.B. appreciates support by European Social Fund and the Federal State of Saxony (ESF-Project “GRAPHD”). M.G. acknowledges the H2020-MSCA-IF-2014 program and W.A. a Heisenberg professorship by the DFG. This work was partially supported by the ERC Consolidator Grant NanoSurfs (no. 615233), the Max Planck Society, the German Excellence Initiative“Center for Advancing Electronics Dresden” (cfaed), and the Graphene Flagship.
14th European Conference on Molecular Electronics (ECME) was successfully held in Dresden
Published on October 6, 2017
Prof. Xinliang Feng was one of the co-organizers of the successful ECME conference which was held from August 29 – September 2 2017.
The workshop took place in Dresden and covered all areas related to molecular -organic and plastic- electronics including chemistry, physics, biology,
materials science, nanoscience, engineering, device fabrication and commercialization.
Guest lecture - Prof. Emil List-Kratochvil, Humboldt-Universität zu Berlin
Published on September 29, 2017
Speaker: Prof. Emil List-Kratochvil, Humboldt-Universität zu Berlin
Marcus Richter wins the ACS Nano Poster Prize Award
Published on September 5, 2017
Congratulations to cfaed PhD student Marcus Richter for being honored with one of three prestigious ACS Nano Poster Prize Awards at the ChinaNANO 2017 in Beijing, which was held between August 29-31. He received it for his poster on “Polycyclic Azomethine Ylides as Versatile Building Block for Unprecedented N-doped Nanographenes”. A total of over 800 posters were pitching at the conference. The prize was handed over by Prof. Paul S. Weiss (founding Editor-in-Chief of ACS Nano) during the closing session. Marcus Richter, who was supported by the cfaed Inspire Grant, visited the chairs of Prof. Carlos-Andres Palma, Prof. Shixuan Du and Prof. Hong-Jun Gao at the Institute of Physics at the Chinese Academy of Science in Beijing for two months.
ChinaNANO 2017 is intended to stimulate discussions on the forefront of research in nanoscience and nanotechnology. The conference will focus on carbon nanomaterials, inorganic nanomaterials and MOFs, self-assembly and soft nanomaterials, nanocatalysis, nano-composites and applications, energy nanotechnology, environmental nanoscience and nanotechnology, nanophotonics and plasmonics, 2D materials beyond graphene and nanodevices, nanocharacterization, standards and metrology, modeling and simulation of nanostructures, nanobiotechnology and nanomedicine, nanotechnology for bioimaging and diagnostics, safety and health of nanomaterials,printing of nanomaterilas and applications as well as optoelectronic nanomaterials and devices.
About ACS Nano
Published monthly, ACS Nano is an international forum for the communication of comprehensive articles on nanoscience and nanotechnology research at the interfaces of chemistry, biology, materials science, physics, and engineering. Moreover, the journal helps facilitate communication among scientists from these research communities in developing new research opportunities, advancing the field through new discoveries, and reaching out to scientists at all levels.
The 1st China-EU Graphene Flagship Bilateral Workshop on Graphene and 2D Materials was co-organized by Prof. Xinliang Feng in Beijing, China
Published on July 7, 2017
Prof. Xinliang Feng was one of the co-organizers of the successful 1st China-EU Graphene Flagship Workshop on Graphene and 2D Materials.
The workshop took place in Beijing, China at the Chinese Academy of Sciences (IOP, CAS) from June 29th - July 2nd, 2017.
Guest lecture - Prof. Wei Zhang, University of Colorado Boulder, USA
Published on July 7, 2017
Speaker: Prof. Wei Zhang, University of Colorado Boulder, USA
Hamburg Science Award 2017 goes to Klaus Müllen and Xinliang Feng
Published on June 27, 2017
Klaus Müllen of Max Planck Institute for Polymer Research (MPI-P) in Mainz and Xinliang Feng of Center for Advancing Electronics Dresden / Technische Universität Dresden will be awarded the Hamburg Science Award 2017, which this year is dedicated to the subject of energy efficiency. The Academy of Sciences and Humanities thus honours the two chemists’ research in the field of graphene research. This functional material, which – due to its various properties – has since its discovery in 2004 been considered as the material of the future, is especially suitable to be used in batteries and supercapacitors. [...]
Workshop "Chemistry of 2-Dimensional Materials" in Dresden
Published on June 23, 2017
This workshop unites internationally renowed experts to share their experiences in this field of research and serves as a plattform for joint discussions.Download workshop flyer (PDF file)
Prof. Xinliang Feng's & Prof. Klaus Müllen's book "Chemistry of Carbon Nanostructes" has been published
Published on June 23, 2017
Carbon Materials such as nanoparticles, fibres, adamantane- and graphene-like structures are widely used in science and engineering. Applications range from energy and gas storage to electronics and optical applications. The internationally renowned experts who contributed to this book discuss chemical aspects of carbon structures, their synthesis, functionalization and design strategies for defined applications.
Link: De Gruyter
π-Extended and Curved Antiaromatic Polycyclic Hydrocarbons
June 13, 2017
To date, it remains a great challenge to develop the p-extended anti-aromatic polycyclic hydrocarbons (PHs) with more than 20 p-electrons. Moreover, the anti-aromatic PHs reported till now mainly adopt a planar p-conjugated carbon skeleton. In order to pursue the synthesis of novel p-extended and stable anti-aromatic PHs, Cfaed scientists at TU Dresden and collaborators reported the solution synthesis of air-stable 24 and 28 p-electron anti-aromatic PHs (1a and 1b) by laterally extending indeno[1,2-b]fluorene and fluoreno[3,2-b]fluorene, respectively. In addition, for the first time, a curved 48 p-electrons anti-aromatic molecule (1c) was synthesized. The X-ray crystallographic analysis confirms that while 1a and 1b manifest planar structures, 1c shows a curved p-conjugated carbon skeleton. The experimental results demonstrated that 1a, 1b and 1c represent a new type of air-stable, fully conjugated anti-aromatic PHs, which can be used as potential candidates in optoelectronic devices due to their narrow HOMO-LUMO energy gaps and excellent reversible electron transfer properties. The synthetic strategy towards anti-aromatic PHs by building five-membered rings from the ortho-substituted benzene units and the combination of cove-edge structures, can be applied to the construction of other air-stable p-expanded and curved anti-aromatic PHs as well as even helical graphene nanoribbons. The related works are published in J. Am. Chem. Soc.
For more details please click on the link: JACS
Prof. Xinliang Feng receives ERC Proof of Concept Grant
June 13, 2017
In May 2017 the European Research Council ERC awarded Proof of Concept Grants, each worth 150,000 €, to fifty one people - Prof. Dr. Xinliang Feng is one of the grant holders. The Proof of Concept grants can be used, for example, to establish intellectual property rights, investigate business opportunities or conduct technical validation.
Synthesis of Molecular Hydrogen: Novel Method Sets Benchmark for Platinum-free Electrocatalysts
May 26, 2017
A paper from cfaed’s Chair for Molecular Functional Materials co-authored by researchers at universities and institutes in Germany, France and Japan has been published in Nature Communications on 17th May 2017.
The paper titled “Efficient hydrogen production on MoNi4 electrocatalysts with fast water dissociation kinetics” describes a new approach to revolutionize the production of molecular hydrogen.
This gas is considered to be one of the most promising energy carriers of the future.
Efficient hydrogen production on MoNi4 electrocatalysts with fast water dissociation kinetics. J. Zhang, T. Wang, P. Liu, Z. Liao, S. Liu, X. Zhuang, M. Chen, E. Zschech, X. Feng* Nat. Commun.
This work was financially supported by the ERC Grant on 2DMATER and EC under Graphene Flagship (No. CNECT-ICT-604391).
Link: Nature Communications
Prof. Xinliang Feng wins the 2017 Small Young Innovator Award
May 26, 2017
The Small Young Innovator Award recognizes outstanding, interdisciplinary scientific work in the development and fundamental understanding of nanoscience and nanotechnology by a young scientist or engineer. Prof. Feng is one of the two winners of the Small Young Innovator Award, receiving it for his important contributions to 2D nanomaterials. The award ceremony took place during the "Small Science Symposium" in Hong Kong at the Hong Kong Polytechnic University on May 16, 2017.
Link: cfaed - NEWS
Ultrafast Delamination of Graphite into High-Quality Graphene Using Alternating Currents
May 5, 2017
Global progress in graphene research is expected to unlock a new era in the next generation of electronics. To bridge the gap between laboratory-scale study and commercial applications, mass production of high quality graphene is essential. Here Cfaed scientists at TU Dresden and collaborators demonstrate a scalable exfoliation strategy towards the production of graphene sheets that has excellent yield (ca. 75 %, 1-3 layers), low defect density (a C/O ratio of 21.2), great solution-processability and outstanding electronic property (a hole mobility of 430 cm2•V-1•s-1). By applying alternating currents, dual exfoliation at both graphite electrodes enables a high production rate exceeding 20 g h-1 in laboratory tests. As a cathode material for lithium storage, graphene-wrapped LiFePO4 particles deliver a high capacity of 167 mAh g-1 at 1 C rate after 500 cycles. The high-quality solution-processable exfoliated graphene holds great promise for a wide spectrum of applications, such as inkjet printing, solar cells and composites.This work was financially supported by ERC grants on 2DMATER and UPGreen, the EC under Graphene Flagship (No. CNECT-ICT-604391).
Sheng Yang, Antonio Gaetano Ricciardulli, Shaohua Liu, Renhao Dong, Martin R. Lohe, Alfons Becker, Marco A. Squillaci, Paolo Samorì, Klaus Müllen*, Xinliang Feng*
Ultrafast Delamination of Graphite into High-Quality Graphene Using Alternating Currents
Angew. Chem. Int. Ed. 2017, 56, 1 - 8, DOI: 10.1002/anie.201702076
Angew. Chem.. 2017, 129, 1- 8, DOI: 10.1002/ange.201702076 (hot paper)
Link to AngewChem
Honorable Mention for the 2017 IUPAC-SOLVAY International Award for Young Chemists
April 5, 2017
The International Union of Pure and Applied Chemistry and Solvay announced the winners of the 2017 IUPAC-Solvay International Award for Young Chemists, presented for the best Ph.D. theses in the
chemical sciences, as described in 1000-word essays.
Link to IUPAC
cfaed Successfully Presented at 'Graphene2017' in Barcelona - Next Year's Conference Will be Held in Dresden
April 4, 2017
With the support of the cfaed team, Prof. Xinliang Feng's Chair for Molecular Functional Materials was able to successfully present the Cluster with its own booth at the largest European graphene conference in Barcelona. For four days, representatives of the areas atomic precision (Reinhard Berger), energy storage and transformation (Xiaodong Zhuang), and production and innovation (Martin Lohe) were in close contact with numerous visitors. Many questions about the properties and possible applications of graphene and nanographene strips were discussed. In the closing session of the conference, a big success could be publicly announced: We are pleased to reveal that the 'Graphene 2018' will take place in Dresden!
Link to Press release
Coordination Polymer Framework-Based On-Chip Micro-Supercapacitors with AC Line-Filtering Performance
April 4, 2017
On-chip micro-supercapacitors (MSCs) are important Si-compatible power source backups for miniaturized electronics, owing to their rapid energy-harvesting features, burst-mode power delivery,
and in particular the good compatibility with Si. However, current on-chip MSCs require harsh processing conditions (high-temperature fabrication, oxygen plasma and wet-chemistry etching, etc.),
and typically perform like resistors when filtering ripples from alternating current (AC). Therefore, the development of Si-compatible MSCs with facile fabrication procedure is an urgent task for
their practical applications.
C. Yang, K. S. Schellhammer, F. Ortmann, S. Sun, R. Dong, M. Karakus, Z. Mics, M. Löffler, F. Zhang, X. Zhuang,* E. Cánovas,* G. Cuniberti, M. Bonn, X. Feng* Coordination Polymer Framework Based On-Chip Micro-Supercapacitors with AC Line-Filtering Performance Angew. Chem. Int. Ed. 2017, 56, 3920-3924. [DOI: 10.1002/anie.201700679] [very important paper]
Link to Angewandte Chemie
Guest lecture - Prof. Hossam Haick, Technion - Israel Institute of Technology, Israel
March 24, 2017
Speaker: Prof. Hossam Haick, Technion - Israel Institute of Technology, Israel
Highly Stable Open-Shell Nanographenes with a Saddle-Shaped Geometry
February 16, 2017
Open-shell nanographenes (or polycyclic hydrocarbons) have attracted a great deal of interest because of their unique nonlinear optical, electronic and magnetic properties,
making them promising candidates for organic electronic and spintronic devices. However, it is the intrinsic instability of the biradical species that limits the practicality
of this research. The scientists from Dresden University of Technology (Prof. Xinliang Feng) reported the synthesis of the first example of highly stable open-shell nanographenes
with a saddle-shaped p-conjugated geometry. The achieved saddle-shaped nanographenes exhibits an open-shell singlet biradical structure (biradical index: y = 0.69) in the ground state
with a narrow optical energy gap of 0.92 eV. More importantly, the title nanographene displays excellent stability at air and sun light conditions, with the half-life time (t1/2)
as long as 39 days. The synthetic concept reported in this work introduces new perspectives on the accessibility of high-spin graphene-like moleculae with a view towards potential
materials applications in organic spintronics. The related works are published in Angewandte Chemie, for more details please click the link: http://dx.doi.org/10.1002/anie.201611689.
Link to Angewandte Chemie
Persulfurated Coronene: A New Generation of “Sulflower”
February 12, 2017
Currently, fully sulfur-substituted polycyclic aromatic hydrocarbons (PAHs) carrying fused disulfide bonds at the periphery have not yet been achieved. Here, Cfaed scientists at TU Dresden with collaborators report the first synthesis of a persulfurated PAH as a next-generation “sulflower.” In this novel PAH, disulfide units establish an all-sulfur periphery around a coronene core (C24S12). The structure, electronic properties, and redox behavior were investigated by microscopic, spectroscopic and electrochemical methods and supported by density functional theory (DFT). The sulfur-rich character of persulfurated coronene renders it a promising cathode material for lithium-sulfur batteries, displaying a high capacity of 520 mAh g-1 after 120 cycles at 0.6 C with a high-capacity retention of 90%. The protocol established in this work offers unique access to larger PAHs and graphene (or graphene nanoribbons) with persulfurated edges and paves the way toward promising applications in OFETs, OPVs, energy, and superconductor-related areas.
Link to JACS
December 6, 2016
Smart micro-/nano-devices or stimuli-responsive devices have attracted substantial attention due to a wide range of needs for smart modern electronics.
Nevertheless, it remains a great challenge to integrate various kinds of stimuli into modern functional devices without sacrificing the device performance,
most probably due to the poor compatibility among those stimuli, active materials, and processing technologies. The scientists from Dresden University of Technology
(Prof. Xinliang Feng) and Chemnitz University of Technology (Prof. Oliver G. Schmidt) reported the fabrication of the first stimulus-responsive micro-supercapacitor
(SR-MSC) with ultrahigh volumetric energy density (20 mWh cm-3 at 235 W cm-3) and reversible electrochromic effect by employing vanadium pentoxide and electrochemical
exfoliated graphene-based hybrid nanopaper and viologen as electrode and stimulus-responsive material, respectively. The fabricated high performance SR-MSCs offer new
opportunities for intuitively observing the working state of energy devices without the aid of extra equipment and techniques.
Wafer-sized multifunctional polyimine-based two-dimensional conjugated polymers with high mechanical stiffness
November 16, 2016
Two-dimensional (2D) soft materials have attracted increasing attention in chemistry, materials science, nanotechnology and biology due to their fascinating optical, electrical, mechanical and magnetic properties derived from the reduction of dimensions. One of the key challenges in 2D materials is to go beyond graphene, a prototype 2D polymer (2DP), and to synthesize its organic analogues with structural control at the atomic- or molecular-level. Here, Cfaed scientists at TU Dresden, reported the successful preparation of porphyrin containing monolayer and multilayer crystalline conjugated 2DPs through the Schiff-base polycondensation reaction at an air-water and liquid-liquid interface. The monolayer 2DP has a thickness of 0.7 nm with a lateral size of 4-inch wafer, and has a Young’s modulus of 267±30 GPa, which is on the same order of graphene (200-1000 GPa). The 2DP has an optical band gap of 1.4 eV and the monolayer 2DP can function as an active semiconducting layer in a thin film transistor and electrocatalyst towards water splitting. This work opens the door for the synthesis of functional 2DPs using reversible polycondensation reaction, which may pave the way for the rational synthesis of 2D organic soft materials for next generation electronics and energy-related applications.
Link to Nature Communications
EU Graphene Flagship Meeting
November 3 & 4, 2016
On November 3rd and 4th a meeting of the EU Graphene Flagship with 31 participants from 18 different European institutes and companies took place at TU Dresden. The purpose of the meeting of the Flagship Work Package 13 on Functional Foams and Coatings led by Professor Xinliang Feng was to discuss recent progress and future perspectives in the field of graphene and related 2D materials. The special focus was their use in coatings, thin films and porous structures like foams and membranes for applications such as energy storage and conversion, catalysis, water remediation and environmental protection.
CFAED Distinguished Lecture Series - Nobel Prize Laureate Professor Sir Konstantin S. Novoselov FRS, University of Manchester, UK
September 16, 2016
Speaker: Professor Sir Konstantin S. Novoselov FRS, University of Manchester, UK
Atom-thick solution to energy storage conundrum
September 12, 2016
Sheets of carbon an atom thick could soon double the amount of electricity stored in smartphone batteries, researchers believe, as 2D materials present a picture of the future of energy storage.
Read full article here: Horizon - The EU Research & Innovation Magazine
Joint Kick-Off Event ESF „Graphene Center Dresden“ and 2.5D-Path of the Center for Advancing Electronics Dresden (cfaed)
September 7, 2016
On September 7th, the official start of the ESF-supported Young Researcher Group ‘Graphene Center Dresden’ (GraphD) took place at TU Dresden. In addition, the initiation of a new path dedicated to two dimensional materials within the Cluster of Excellence Center for Advancing Electronics Dresden (cfaed) was celebrated with the participation of very distinguished guests. The Graphene Center Dresden is an ESF Young Researcher Group, funded by the European Social Fund (ESF), with strong collaboration of many chairs within TU Dresden under the supervision of cfaed’s Strategic Professorship ‘Molecular Functional Materials’ of Prof. Xinliang Feng. Cooperation partners include, e.g., Prof. Sibylle Gemming, Prof. Alexander Eychmüller, Prof. Stefan Kaskel, Prof. Karl Leo, Prof. Stefan Mannsfeld, Prof. Michael Schröter, Prof. Gotthard Seifert as well as Prof. Gianaurelio Cuniberti. All hold important functions within cfaed as research path leaders and principal investigators. With this joint competence, TU Dresden will emerge as one of the most important European actors in the field of the “wonder material” graphene and related two-dimensional materials. These one-atom thin materials exhibit outstanding physical properties, which render them promising candidates for application in various fields of electronic and energy applications as well as, for instance, novel lubricants. Meanwhile, graphene has been implemented in the first industrial applications. This is also one of the core competences of the Graphene Center Dresden: The close relationship to industrial partners is an elementary part of its strategy. The recently started ESF young researcher group ‘GraphD’ is an important milestone, funded by the European Social Fund (ESF). GraphD started on July 1st and consists of three postdocs, six PhD students, and the research group leader Dr. Reinhard Berger. Aims of the group are, amongst others, to attract the world’s most renowned young scientists in the field, train outstanding experts for Saxony’s industry, enforce the innovation potential of local companies, and to efficiently complement the regional cluster of ‘Silicon Saxony’. The Center for Advancing Electronics Dresden currently prepares a proposal within the ‘Excellence Strategy’ of the German Federal and State governments. It’s program will be extended to include research of two-dimensional materials within a new ‘2.5D-path’.
Press Images Kick off Graphen Center DresdenPress Contact: Prof. Xinliang Feng cfaed Chair for Molecular Functional Materials Phone: +49 351 463-43251 E-mail: firstname.lastname@example.org
Matthias Hahndorf Center for Advancing Electronics Dresden (cfaed) Communications Officer Phone: +49 (0)351 463 42847 E-mail: email@example.com All photos: cfaed / Katharina Knaut
Two-Dimensional Mesoscale-Ordered Conducting Polymers
September 7, 2016
Despite the availability of numerous two-dimensional (2D) materials with structural ordering at the atomic or molecular level, direct construction of mesoscale-ordered superstructures within a 2D monolayer remains an enormous challenge. Here, cfaed scientists at TU Dresden with collaborators, report the synergic manipulation of two types of assemblies in different dimensions to achieve 2D conducting polymer nanosheets with structural ordering at the mesoscale. The resulting polyaniline nanosheets feature mesoscale-ordered hexagonal pore arrays, tunable morphologies and pore sizes, large specific surface area as well as anisotropic and record-high electrical conductivity. Such moldable approach creates a new family of mesoscale-ordered structures as well as opens avenues to the programmed assembly of multifunctional materials.
Synthesis of NBN-type Zigzag-Edged Polycyclic Aromatic Hydrocarbons: 1,9-Diaza-9a-boraphenalene as a Structural Motif
August 31, 2016
A novel class of dibenzo-fused 1,9-diaza-9a-boraphenalenes featuring zigzag edges with a nitrogen-boron-nitrogen bonding pattern named NBN-dibenzophenalenes (NBN-DBPs) has been synthesized. Alternating nitrogen and boron atoms imparts high chemical stability to these - else very reactive -zigzag-edged polycyclic aromatic hydrocarbons (PAHs). Upon oxidation, an open-shell intermediate is formed corroborated by spectroscopic calculations and in-situ spectroelectrochemistry. The oxidized nitrogen-boron-nitrogen subunit is isoelectronic to the pristine carbon zigzag periphery but also positively charged. This new synthetic strategy represents an efficient pathway towards NBN-doped zigzag-edged graphene nanoribbons. DOI: 10.1021/jacs.6b04445
Prof. Xinliang Feng has served as the organizer of the Graphene Flagship EU-Korea Workshop on Graphene and related 2D Materials
August 16, 2016
Prof. Xinliang Feng has served as the organizer of the Graphene Flagship EU-Korea Workshop on Graphene and related 2D Materials. The workshop took place in Copenhagen, Denmark from August 15 - 16, 2016. The purpose of the EU-Korea workshop is to exchange experiences, practices and ideas related to the current and emerging topics associated with the basic chemistry approach, materials synthesis, application development and commercialisation for graphene and related 2D materials. In addition, the aim is to explore further possibilities for collaborative research opportunities between researchers in Europe and Korea. This workshop is a follow up of the first EU-Korea workshop held in Busan (Republic of Korea) in 2015.
Chemical approaches to 2D materials
August 12, 2016
[...] Issue 29/2016 of Advanced Materials is a special issue of on chemical approaches to 2D materials, guest edited by Paolo Samorì, Vincenzo Palermo, and Xinliang Feng, which provides a state-of-the-art description of the most enlightening results regarding various chemical approaches to 2D materials, written by some among the most creative scientists in the field.[...]
Link to: Materials Views
Guest lecture - Prof. Josef Michl, University of Colorado Boulder, USA
August 12, 2016
Speaker: Prof. Josef Michl (University of Colorado Boulder, USA)
A New Bowl-shaped Subunit of Fullerene C70
June 29, 2016
Total synthetic approaches of fullerenes are a holy grail for organic chemistry. So far, the main attempts have been focused on the synthesis of the buckminsterfullerene C60. In contrast, access to subunits of the homologue C70 remains challenging. Here, we demonstrate an efficient bottom-up strategy towards a novel bowl-shaped polycyclic aromatic hydrocarbons (PAH) C34 with two pentagons. This PAH represents a subunit for C70 and also of other higher fullerenes. The bowl-shaped structure was unambiguously determined by X-ray crystallography. Especially, a bowl-to-bowl inversion for a C70 fragment in solution was investigated by dynamic NMR analysis, showing a bowl-to-bowl inversion energy (ΔG‡) of 16.7 kcal mol-1, which is further corroborated by DFT calculations.
Link to: ACS Publications JACS
Guest lecture - Prof. Felix R. Fischer, University of California Berkeley
May 25, 2016
Speaker: Prof. Felix R. Fischer (University of California Berkeley)
Guest lecture - Prof. Di Zhang
May 10, 2016
Speaker: Prof. Di Zhang (Shanghai Jiaotong University)
Topical Workshop on Graphene and Nanoscience Held in Dresden
April 25, 2016
On Monday, April 25, 2016 Prof. Xinliang Feng (cfaed / Chair for Molecular Functional Materials) welcomed a delegation of 20 people from the Chinese Graphene Industrial Alliance (CGIA) in Dresden. A workshop on graphene and nanoscience was organized including the top scientific and industrial experts from TU Dresden, Institute for Polymer Research Dresden (Leibniz IPF), and Chinese representatives from industry and science.
Link to: www.cfaed.tu-dresden.de
Graphene nanoribbons: it's all about the edges
March 24, 2016
When electrons spin differently
Graphene slides smoothly across gold
February 26, 2016
Graphene, a modified form of carbon, offers versatile potential for use in coating machine components and in the field of electronic switches. An international team of researchers led by physicists at the University of Basel, and including TU Dresden (Dr. Andrea Benassi and Dr. Xinliang Feng) have been studying the lubricity of this material on the nanometer scale. Since it produces almost no friction at all, it could drastically reduce energy loss in machines when used as a coating, as the researchers report in the journal Science. In future, graphene could be used as an extremely thin coating, resulting in almost zero energy loss between mechanical parts. This is based on the exceptionally high lubricity—or so-called superlubricity—of modified carbon in the form of graphene. Applying this property to mechanical and electromechanical devices would not only improve energy efficiency but also considerably extend the service life of the equipment. Fathoming out the causes of the lubricant behavior An international community of physicists have studied the above-average lubricity of graphene using a two-pronged approach combining experimentation and computation. To do this, they anchored two-dimensional strips of carbon atoms—so-called graphene nanoribbons—to a sharp tip and dragged them across a gold surface. Computer-based calculations were used to investigate the interactions between the surfaces as they moved across one another. Using this approach, the research team is hoping to fathom out the causes of superlubricity; until now, little research has been carried out in this area. By studying the graphene nanoribbons, the researchers hope to learn about more than just the slip behavior. Measuring the mechanical properties of the carbon-based material also makes sense because it offers excellent potential for a whole range of applications in the field of coatings and micromechanical switches. In future, even electronic switches could be replaced by nanomechanical switches, which would use less energy for switching on and off than conventional transistors. The experiments revealed almost perfect, frictionless movement. It is possible to move graphene nanoribbons with a length of 5 to 50 nanometers using extremely small forces (2 to 200 piconewtons). There is a high degree of consistency between the experimental observations and the computer simulation. A discrepancy between the model and reality appears only at greater distances (five nanometers or more) between the measuring tip and the gold surface. This is probably because the edges of the graphene nanoribbons are saturated with hydrogen, which was not accounted for in the simulations. "Our results help us to better understand the manipulation of chemicals at the nano level and pave the way for creating frictionless coatings," write the researchers.
Link to: www.science.org
Patterning two-dimensional free-standing surfaces with mesoporous conducting polymers
November 18, 2015
The ability to pattern functional moieties with well-defined architectures is highly important in material science, nanotechnology and bioengineering. Although two-dimensional surfaces can serve as attractive platforms, direct patterning them in solution with regular arrays remains a major challenge. Here, cfaed scientists at TU Dresden with collaborators, developed a versatile route to pattern two-dimensional free-standing surfaces in a controlled manner assisted by monomicelle close-packing assembly of block copolymers, which is unambiguously revealed by direct visual observation. This strategy allows for bottom-up synthesis of two-dimensional mesoporous conducting polymer nanosheets with adjustable mesopores on various functional free-standing surfaces, including two-dimensional graphene, molybdenum sulfide, titania nanosheets, and even on one-dimensional carbon nanotubes. This approach will shed light on developing solution-based soft patterning of given interfaces towards bespoke functions.
Prof. Xinliang Feng raises 'Proof of Concept' Sponsorship from European Research Council
October 28, 2015
Two scientists of TU Dresden succeeded in the second call for proposals of the European Research Council, “Proof of Concept Grants”. One of them is cfaed's Strategic Professor Xinliang Feng who has been honored for his project concerning electrochemical delamination of graphite. The honored scientists will now receive a sponsorship up to 150.000 Euros, which will contain a study about the viability of commercial utilization of the excellent research results. To apply for the sponsorship it was required that the scientists and projects had already been promoted by ERC. With the 'Proof of Concept Grant' the ERC wants to make a contribution to growth and innovation in the European Union.
Link to: http://www.wib.sachsen.de/12649.htm
"Nanocarbons for Advanced Energy Conversion" Volume 2 edited by Prof. Xinliang Feng
October 22, 2015
Wiley has published the book "Nanocarbons for Advanced Energy Conversion" which has been edited by Prof. Xinliang Feng. The book is the volume 2 of the book series on nanocarbons for advanced applications.
Radical assisted electrochemical exfoliation
October 17, 2015
Despite the intensive research efforts devoted to graphene fabrication over the last decade, the production of high-quality graphene on a large scale, at an affordable cost and in a reproducible manner still represents a great challenge. Cfaed scientists with collaborators report a novel method based on the controlled electrochemical exfoliation of graphite in aqueous ammonium sulfate electrolyte to produce graphene in large quantities and with outstanding quality. The developed exfoliation method results in large graphene sheets (5-10 µm on average), which exhibit outstanding hole mobilities (~405 cm2 V-1 s-1), very low Raman ID/IG ratios (below 0.1), and extremely high carbon to oxygen (C/O) ratios (~25.3). Moreover, the graphene ink prepared in dimethylformamide qualifies this material for intriguing applications such as transparent conductive films and flexible supercapacitors. In general, this robust method for electrochemical exfoliation of graphite offers great promise for the preparation of graphene that can be utilized in industrial applications to create integrated nanocomposites, conductive or mechanical additives as well as energy storage and conversion devices.
Highly Cited Researcher 2015
September 21, 2015
Prof. Dr. Xinliang Feng was listed as highly cited researcher in 2015 (published by Thompson Reuters) for both categories - chemistry and materials science.
Link to: http://highlycited.com/
Temperature-Dependent Multidimensional Self-Assembly of Polyphenylene-Based “Rod-Coil” Graft Polymers
September 7, 2015
cfaed scientists at TU Dresden with collaborators demonstrate a novel type of “rod-coil” graft copolymer containing a polyphenylene backbone linked with poly(ethylene oxide) (PEO) side chains. Such graft copolymers manifest unprecedented temperature-dependent one-dimensional (1D) and two-dimensional (2D) self-assembly in solution. At 20°C, which is higher than the crystallization temperature (Tc) of the PEO chains, the achiral graft copolymers self-organize into nanoribbons that twist into 30 µm ultralong helices with controlled pitch depending on the grafting ratio of the PEO chains. At 10°C, which is lower than the Tc, quadrangular multilayer sheets of over 10 µm in lateral size are obtained. This work presents the first example of controlled self-assembly of graft polymers into 1D helix and 2D sheet superstructures. Such graft polymers provide new opportunities for the controlled preparation of 1D helix and 2D superstructures as well as offer a new system for the fundamental studies on the self-assembly of conjugated polymers, including morphological control, thermodynamics and kinetics, potential applications, etc.
Synthetic two-dimensional conjugated supramolecular polymers (2DSPs) open new application in electrocatalysis
September 7, 2015
Two-dimensional polymers and supramolecular polymers refer to laterally infinite, one monomer-unit thick, free-standing network with a defined internal periodicity based on covalent and non-covalent bond, respectively. They represent a new class of artificially created 2D materials with a manifold of promises in electronics, membrane technology, catalysis, sensing, and energy storage and conversion. Here, cfaed scientists at TU Dresden, reported the synthesis of a large-area (mm²) crystalline 2DSP with a thickness of ˜ 0.7 nm, comprising triphenylene-fused nickel bis(dithiolene) complexes, at an air/water interface of Langmuir-Blodgett trough under ambient conditions. Such 2DSP, processed on a glassy carbon electrode, exhibited excellent electrocatalytic activity for hydrogen evolution reaction from water with a Tafel slope of 80.5 mV decade-1 and an operating overpotential of 333 mV at 10 mA cm-2, which are superior to those of carbon nanotube (CNT)-supported molecular catalysts and heteroatom-doped graphene catalysts. This work opens the door for developing large-area, free-standing 2D organic materials consisting of immobilized molecular catalysis as novel electrode materials bearing functions in energy technologies.
Minisymposium on Graphene Materials
Prof. Hui-Ming Cheng and Prof. Shizhang Qiao
July 15, 2015
Speaker: Prof. Hui-Ming Cheng
Cfaed seminar series
Prof. Maurizio Prato
July 13, 2015
Speaker: Prof. Maurizio Prato
Cfaed seminar series
Prof. Peter Gregory and Prof. Gudrun Walter
June 1, 2015
Publishing without perishing - how does that work?
Cooperations with Talga company on the development of graphene exfoliation and energy technologies
February 6, 2015
Fellow of the Royal Society of Chemistry
November 26, 2014
In November 2014, Prof. Dr. Xinliang Feng has been appointed a Fellow of the Royal Society of Chemistry, UK. The honor is given to researchers who have made outstanding contributions to the advancement of chemical science. The Royal Society of Chemistry has more than 49,000 members worldwide. The largest chemical society in Europe, the organization works to promote the development, practice and application of the chemical sciences across the world. In particular, the society encourages the participation of students and young people in chemistry.
New Certificate: "Highly Cited Researcher"
Prof. Xinliang Feng appears in the 2014 “highly cited researcher” list published by Thompson Reuters. This prestigious list includes scientific researchers whose publications have been cited most often in academic journals over the past decade and rank among the top 1 % most cited for their subject field and year of publication. Those listed are identified as being among the world’s leading scientific minds, along with the universities and institutions which employ them.
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