Journal ArticleDOI
Effect of airborne contaminants on the wettability of supported graphene and graphite
Zhiting Li,Yongjin Wang,Andrew Kozbial,Ganesh Shenoy,Feng Zhou,Rebecca McGinley,Patrick Ireland,Brittni Morganstein,Alyssa Kunkel,Sumedh P. Surwade,Lei Li,Haitao Liu +11 more
TLDR
It is demonstrated that airborne hydrocarbons adsorb on graphitic surfaces, and that a concurrent decrease in the water contact angle occurs when these contaminants are partially removed by both thermal annealing and controlled ultraviolet-O3 treatment.Abstract:
It is generally accepted that supported graphene is hydrophobic and that its water contact angle is similar to that of graphite Here, we show that the water contact angles of freshly prepared supported graphene and graphite surfaces increase when they are exposed to ambient air By using infrared spectroscopy and X-ray photoelectron spectroscopy we demonstrate that airborne hydrocarbons adsorb on graphitic surfaces, and that a concurrent decrease in the water contact angle occurs when these contaminants are partially removed by both thermal annealing and controlled ultraviolet-O3 treatment Our findings indicate that graphitic surfaces are more hydrophilic than previously believed, and suggest that previously reported data on the wettability of graphitic surfaces may have been affected by unintentional hydrocarbon contamination from ambient airread more
Citations
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New Growth Frontier: Superclean Graphene
Jincan Zhang,Luzhao Sun,Kaicheng Jia,Liu Xiaoting,Ting Cheng,Hailin Peng,Li Lin,Zhongfan Liu +7 more
TL;DR: This Perspective aims to provide comprehensive understanding of the intrinsic growth contamination and the experimental solution of making superclean graphene and to provide an outlook for future commercial production of high-quality CVD graphene films.
Journal ArticleDOI
Van der Waals Force Isolation of Monolayer MoS2.
Alper Gurarslan,Shuping Jiao,Tai-De Li,Tai-De Li,Guoqing Li,Yiling Yu,Yang Gao,Yang Gao,Elisa Riedo,Zhi Ping Xu,Linyou Cao +10 more
TL;DR: Monolayer MoS2 can effectively screen the vdW interaction of underlying substrates with external systems by >90% because of the substantial increase in the separation between the substrate and external systems due to the presence of the monolayer.
Journal ArticleDOI
A Force-Engineered Lint Roller for Superclean Graphene.
Luzhao Sun,Li Lin,Li Lin,Zihao Wang,Dingran Rui,Zhiwei Yu,Jincan Zhang,Yanglizhi Li,Liu Xiaoting,Kaicheng Jia,Kexin Wang,Liming Zheng,Bing Deng,Tianbao Ma,Ning Kang,Hongqi Xu,Konstantin S. Novoselov,Hailin Peng,Zhongfan Liu +18 more
TL;DR: An efficient postgrowth treatment method for selectively removing surface contamination to achieve a large-area superclean graphene surface is reported and can be transferred to dielectric substrates with significantly reduced polymer residues, yielding ultrahigh carrier mobility.
Journal ArticleDOI
Water friction in nanofluidic channels made from two-dimensional crystals.
Ashok Keerthi,Solleti Goutham,Yi You,Pawin Iamprasertkun,Pawin Iamprasertkun,Robert A. W. Dryfe,Andre K. Geim,Boya Radha +7 more
TL;DR: In this paper, the effect of confining walls' material on water friction was investigated in angstrom-scale capillaries made from atomically flat crystals and showed that strong hydrophobicity does not rule out enhanced stickiness and friction.
Journal ArticleDOI
Structural superlubricity in graphite flakes assembled under ambient conditions
TL;DR: For such friction pairs, the underlying mechanism for the new running-in process is revealed to be the removal of third bodies confined between the surfaces, which improves the understanding of microscale superlubricity and may help extend the practical applications of superl lubricity.
References
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Book
Physical chemistry of surfaces
TL;DR: In this paper, the authors discuss the nature and properties of liquid interfaces, including the formation of a new phase, nucleation and crystal growth, and the contact angle of surfaces of solids.
Journal ArticleDOI
Large-Area Synthesis of High-Quality and Uniform Graphene Films on Copper Foils
Xuesong Li,Weiwei Cai,Jinho An,Seyoung Kim,Junghyo Nah,Dongxing Yang,Richard D. Piner,Aruna Velamakanni,Inhwa Jung,Emanuel Tutuc,Sanjay K. Banerjee,Luigi Colombo,Rodney S. Ruoff +12 more
TL;DR: It is shown that graphene grows in a self-limiting way on copper films as large-area sheets (one square centimeter) from methane through a chemical vapor deposition process, and graphene film transfer processes to arbitrary substrates showed electron mobilities as high as 4050 square centimeters per volt per second at room temperature.
Journal ArticleDOI
High-yield production of graphene by liquid-phase exfoliation of graphite
Yenny Hernandez,Valeria Nicolosi,Mustafa Lotya,Fiona M. Blighe,Zhenyu Sun,Sukanta De,I.T. McGovern,Brendan Holland,Michele T. Byrne,Yurii K. Gun'ko,John J. Boland,Peter Niraj,Georg S. Duesberg,Satheesh Krishnamurthy,Robbie Goodhue,John L. Hutchison,Vittorio Scardaci,Andrea C. Ferrari,Jonathan N. Coleman +18 more
TL;DR: Graphene dispersions with concentrations up to approximately 0.01 mg ml(-1), produced by dispersion and exfoliation of graphite in organic solvents such as N-methyl-pyrrolidone are demonstrated.
Journal ArticleDOI
Carbon-based Supercapacitors Produced by Activation of Graphene
Yanwu Zhu,Shanthi Murali,Meryl D. Stoller,K. J. Ganesh,Weiwei Cai,Paulo J. Ferreira,Adam Pirkle,Robert M. Wallace,Katie A. Cychosz,Matthias Thommes,Dong Su,Eric A. Stach,Rodney S. Ruoff +12 more
TL;DR: This work synthesized a porous carbon with a Brunauer-Emmett-Teller surface area, a high electrical conductivity, and a low oxygen and hydrogen content that has high values of gravimetric capacitance and energy density with organic and ionic liquid electrolytes.
Journal ArticleDOI
Monitoring dopants by Raman scattering in an electrochemically top-gated graphene transistor
Anindya Das,Simone Pisana,Biswanath Chakraborty,S. Piscanec,Srijan Kumar Saha,Umesh V. Waghmare,Kostya S. Novoselov,H. R. Krishnamurthy,Andre K. Geim,Andrea C. Ferrari,A. K. Sood +10 more
TL;DR: This work demonstrates a top-gated graphene transistor that is able to reach doping levels of up to 5x1013 cm-2, which is much higher than those previously reported.