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
Citations
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Solution-processed PEDOT:PSS films with conductivities as indium tin oxide through a treatment with mild and weak organic acids.
TL;DR: Significant conductivity enhancements are achieved on PEDOT:PSS films after treatment with mild and weak organic acids and this method is better than that using very strong and corrosive acids like sulfuric acid.
Journal ArticleDOI
Myoblast differentiation on graphene oxide.
Sook Hee Ku,Chan Beum Park +1 more
TL;DR: The ability of GO to stimulate myogenic differentiation was remarkably enhanced on GO, which resulted from serum protein adsorption and nanotopographical cues, showing a potential for skeletal tissue engineering applications.
Journal ArticleDOI
Bridging the Gap between Reality and Ideal in Chemical Vapor Deposition Growth of Graphene
TL;DR: This Review will emphasize the recent advances and strategies in CVD production of graphene for settling issues to bridge the giant gap, and discusses the strategies for perfecting the quality of CVD-derived graphene with regard to domain size, cleanness, flatness, growth rate, scalability, and direct growth of graphene on functional substrate.
Journal ArticleDOI
Sonochemical synthesis of TiO2 nanoparticles on graphene for use as photocatalyst
Jingjing Guo,Shenmin Zhu,Zhixin Chen,Yao Li,Ziyong Yu,Qinglei Liu,Jingbo Li,Chuanliang Feng,Di Zhang +8 more
TL;DR: Using ultrasonication the authors succeed in a controlled incorporation of TiO(2) nanoparticles on the graphene layers homogeneously in a few hours, which is attributed to the pyrolysis and condensation of the dissolved TiCl(4) into TiO (2) by ultrasonic waves.
Journal ArticleDOI
Dual role of glycine as a chemical functionalizer and a reducing agent in the preparation of graphene: an environmentally friendly method
TL;DR: In this article, the reduction of graphite oxide using glycine as both a chemical functionalizer and a reducing agent is reported. But the reduction could occur under mild conditions and the as-produced graphene sheets show impressive crystalline behavior and admirable aqueous dispersibility without employing any external stabilizing reagents.
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.
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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.
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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.
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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.
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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.