Journal ArticleDOI
Large-scale pattern growth of graphene films for stretchable transparent electrodes
Keun Soo Kim,Yue Zhao,Houk Jang,Sang Yoon Lee,Jong Min Kim,Kwang S. Kim,Jong Hyun Ahn,Philip Kim,Philip Kim,Jae-Young Choi,Byung Hee Hong +10 more
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TLDR
The direct synthesis of large-scale graphene films using chemical vapour deposition on thin nickel layers is reported, and two different methods of patterning the films and transferring them to arbitrary substrates are presented, implying that the quality of graphene grown by chemical vapours is as high as mechanically cleaved graphene.Abstract:
Problems associated with large-scale pattern growth of graphene constitute one of the main obstacles to using this material in device applications. Recently, macroscopic-scale graphene films were prepared by two-dimensional assembly of graphene sheets chemically derived from graphite crystals and graphene oxides. However, the sheet resistance of these films was found to be much larger than theoretically expected values. Here we report the direct synthesis of large-scale graphene films using chemical vapour deposition on thin nickel layers, and present two different methods of patterning the films and transferring them to arbitrary substrates. The transferred graphene films show very low sheet resistance of approximately 280 Omega per square, with approximately 80 per cent optical transparency. At low temperatures, the monolayers transferred to silicon dioxide substrates show electron mobility greater than 3,700 cm(2) V(-1) s(-1) and exhibit the half-integer quantum Hall effect, implying that the quality of graphene grown by chemical vapour deposition is as high as mechanically cleaved graphene. Employing the outstanding mechanical properties of graphene, we also demonstrate the macroscopic use of these highly conducting and transparent electrodes in flexible, stretchable, foldable electronics.read more
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Microporous membranes comprising conjugated polymers with rigid backbones enable ultrafast organic-solvent nanofiltration
Bin Liang,Hui Wang,Xinghua Shi,Baoying Shen,Xiao He,Zahid Ali Ghazi,Niaz Ali Khan,Haksong Sin,Abdul Muqsit Khattak,Lianshan Li,Zhiyong Tang +10 more
TL;DR: Microporous conjugated-polymer membranes have now been fabricated through surface-initiated polymerization and are capable of ultrafast organic-solvent nanofiltration because of the high porosity and pore interconnectivity originating from the rigid skeleton.
Journal ArticleDOI
From biomass wastes to large-area, high-quality, N-doped graphene: catalyst-free carbonization of chitosan coatings on arbitrary substrates
TL;DR: Pyrolysis of chitosan films under argon at 800 °C and under inert atmosphere gives rise to high-quality single layer N-doped graphene films (over 99% transmittance) as evidenced by XPS, Raman spectroscopy, and TEM imaging.
Journal ArticleDOI
The role of microwave absorption on formation of graphene from graphite oxide
TL;DR: In this article, the authors demonstrate that the microwave absorption capacity of carbon materials is highly dependent on their chemical composition and structure, and that the increase of oxygen content in graphite oxides (GO) and/or graphene-based materials remarkably decreases its microwave absorption due to the size decrease of the π-π conjugated structure in these materials, and vice versa.
Journal ArticleDOI
A comprehensive review on graphene-based anti-corrosive coatings
TL;DR: Graphene has attracted significant attention for applications in many industrial fields due to its excellent anti-corrosion properties, and a series of satisfactory results have been achieved in recent years as discussed by the authors.
Journal ArticleDOI
Graphene–Gold Metasurface Architectures for Ultrasensitive Plasmonic Biosensing
Shuwen Zeng,Shuwen Zeng,Kandammathe Valiyaveedu Sreekanth,Jingzhi Shang,Ting Yu,Chih-Kuang Chen,Feng Yin,Dominique Baillargeat,Dominique Baillargeat,Philippe Coquet,Philippe Coquet,Ho-Pui Ho,Andrei V. Kabashin,Ken-Tye Yong,Ken-Tye Yong +14 more
TL;DR: Benefiting from extreme phase singularities of reflected light induced by strong plasmon-mediated energy confinements, the metasurface demonstrates a much-improved sensitivity to molecular bindings nearby and achieves an ultralow detection limit.
References
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Journal ArticleDOI
Electric Field Effect in Atomically Thin Carbon Films
Kostya S. Novoselov,Andre K. Geim,Sergey V. Morozov,Da Jiang,Y. Zhang,S. V. Dubonos,Irina V. Grigorieva,A. A. Firsov +7 more
TL;DR: Monocrystalline graphitic films are found to be a two-dimensional semimetal with a tiny overlap between valence and conductance bands and they exhibit a strong ambipolar electric field effect.
Journal ArticleDOI
The rise of graphene
TL;DR: Owing to its unusual electronic spectrum, graphene has led to the emergence of a new paradigm of 'relativistic' condensed-matter physics, where quantum relativistic phenomena can now be mimicked and tested in table-top experiments.
Journal ArticleDOI
Two-dimensional gas of massless Dirac fermions in graphene
Kostya S. Novoselov,A. K. Geim,Sergey V. Morozov,Da Jiang,Mikhail I. Katsnelson,Irina V. Grigorieva,S. V. Dubonos,A. A. Firsov +7 more
TL;DR: This study reports an experimental study of a condensed-matter system (graphene, a single atomic layer of carbon) in which electron transport is essentially governed by Dirac's (relativistic) equation and reveals a variety of unusual phenomena that are characteristic of two-dimensional Dirac fermions.
Journal ArticleDOI
Measurement of the Elastic Properties and Intrinsic Strength of Monolayer Graphene
TL;DR: Graphene is established as the strongest material ever measured, and atomically perfect nanoscale materials can be mechanically tested to deformations well beyond the linear regime.
Journal ArticleDOI
Raman spectrum of graphene and graphene layers.
Andrea C. Ferrari,Jannik C. Meyer,Vittorio Scardaci,Cinzia Casiraghi,Michele Lazzeri,Francesco Mauri,S. Piscanec,Da Jiang,K. S. Novoselov,S. Roth,A. K. Geim +10 more
TL;DR: This work shows that graphene's electronic structure is captured in its Raman spectrum that clearly evolves with the number of layers, and allows unambiguous, high-throughput, nondestructive identification of graphene layers, which is critically lacking in this emerging research area.