Journal ArticleDOI
Frictional Characteristics of Atomically Thin Sheets
Changgu Lee,Qunyang Li,William B. Kalb,Xin-Zhou Liu,Helmuth Berger,Robert W. Carpick,James Hone +6 more
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TLDR
In this article, the authors compared the nanoscale frictional characteristics of atomically thin sheets of graphene, molybdenum disulfide (MoS2), niobium diselenide, and hexagonal boron nitride exfoliated onto a weakly adherent substrate (silicon oxide) to those of their bulk counterparts.Abstract:
Using friction force microscopy, we compared the nanoscale frictional characteristics of atomically thin sheets of graphene, molybdenum disulfide (MoS2), niobium diselenide, and hexagonal boron nitride exfoliated onto a weakly adherent substrate (silicon oxide) to those of their bulk counterparts. Measurements down to single atomic sheets revealed that friction monotonically increased as the number of layers decreased for all four materials. Suspended graphene membranes showed the same trend, but binding the graphene strongly to a mica surface suppressed the trend. Tip-sample adhesion forces were indistinguishable for all thicknesses and substrate arrangements. Both graphene and MoS2 exhibited atomic lattice stick-slip friction, with the thinnest sheets possessing a sliding-length-dependent increase in static friction. These observations, coupled with finite element modeling, suggest that the trend arises from the thinner sheets' increased susceptibility to out-of-plane elastic deformation. The generality of the results indicates that this may be a universal characteristic of nanoscale friction for atomically thin materials weakly bound to substrates.read more
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Boron nitride substrates for high-quality graphene electronics
Cory Dean,Andrea Young,Inanc Meric,Changgu Lee,Lei Wang,Sebastian Sorgenfrei,Kenji Watanabe,Takashi Taniguchi,Philip Kim,Kenneth L. Shepard,James Hone +10 more
TL;DR: Graphene devices on h-BN substrates have mobilities and carrier inhomogeneities that are almost an order of magnitude better than devices on SiO(2).
Journal ArticleDOI
Graphene-Like Two-Dimensional Materials
Journal ArticleDOI
Photoluminescence from Chemically Exfoliated MoS2
Goki Eda,Goki Eda,Hisato Yamaguchi,Damien Voiry,Takeshi Fujita,Mingwei Chen,Manishkumar Chhowalla +6 more
TL;DR: Above an annealing temperature of 300 °C, chemically exfoliated MoS2 exhibit prominent band gap photoluminescence, similar to mechanically exfoliate monolayers, indicating that their semiconducting properties are largely restored.
Journal ArticleDOI
Large Scale Growth and Characterization of Atomic Hexagonal Boron Nitride Layers
Li Song,Lijie Ci,Hao Lu,Pavel B. Sorokin,Chuanhong Jin,Jie Ni,Alexander G. Kvashnin,Dmitry G. Kvashnin,Jun Lou,Boris I. Yakobson,Pulickel M. Ajayan +10 more
TL;DR: The large area synthesis of h-BN films consisting of two to five atomic layers, using chemical vapor deposition, show a large optical energy band gap of 5.5 eV and are highly transparent over a broad wavelength range.
Journal ArticleDOI
Recent Advances in Two-Dimensional Materials beyond Graphene
Ganesh R. Bhimanapati,Zhong Lin,Vincent Meunier,Vincent Meunier,Yeonwoong Jung,Jangho J Cha,Saptarshi Das,Di Xiao,Young-Woo Son,Michael S. Strano,Valentino R. Cooper,Liangbo Liang,Liangbo Liang,Steven G. Louie,Steven G. Louie,Emilie Ringe,Wenchao Zhou,Steve S. Kim,Rajesh R. Naik,Bobby G. Sumpter,Humberto Terrones,Humberto Terrones,Fengnian Xia,Yeliang Wang,Jian Zhu,Deji Akinwande,Nasim Alem,Jon A. Schuller,Raymond E. Schaak,Mauricio Terrones,Joshua A. Robinson +30 more
TL;DR: Insight is provided into the theoretical modeling and understanding of the van der Waals forces that hold together the 2D layers in bulk solids, as well as their excitonic properties and growth morphologies.
References
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Kostya S. Novoselov,Da Jiang,Fred Schedin,Timothy J. Booth,V. V. Khotkevich,Sergey V. Morozov,Andre K. Geim +6 more
TL;DR: By using micromechanical cleavage, a variety of 2D crystals including single layers of boron nitride, graphite, several dichalcogenides, and complex oxides are prepared and studied.
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Energy band-gap engineering of graphene nanoribbons.
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