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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Journal ArticleDOI
Bidirectional regulation of configuration of the carbon nanotube containing a water droplet.
TL;DR: It is found for the first time that the electric field and temperature can be used to co-regulate a reversible change of cross-sectional configuration of Single-Wall Carbon Nanotubes (SWCNTs).
Journal ArticleDOI
Reversible hydrogenation restores defected graphene to graphene
Lin Jiang,Pauline M. G. van Deursen,Hadi Arjmandi-Tash,Liubov A. Belyaeva,Haoyuan Qi,Haoyuan Qi,Jiao He,V. Kofman,Longfei Wu,Valery Muravev,Ute Kaiser,Harold Linnartz,Emiel J. M. Hensen,Jan P. Hofmann,Grégory F. Schneider +14 more
TL;DR: In this article, a facile hydrogenation-dehydrogenation strategy was proposed to remove hydrocarbon contaminations and preserve the excellent transport properties of monolayer graphene using electron microscopy.
DissertationDOI
Understanding and Controlling Wettability of Carbon Powders for PEM Fuel Cell Applications
Journal ArticleDOI
Evidence of (anti)metamorphic properties of modified graphitic surfaces obtained in real time at a single-molecule level.
TL;DR: This work quantitatively characterize the evolution of height and shape of individual RNAP molecules adsorbed on a HOPG surface modified with an oligoglycine-hydrocarbon graphite modifier (GM) during the unfolding process and determines the characteristic unfolding time as ∼7 min.
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.