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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Parahydrophobicity and stick-slip wetting dynamics of vertically aligned carbon nanotube forests
Ziyu Zhou,Tongchuan Gao,Sean McCarthy,Andrew Kozbial,Susheng Tan,David Pekker,Lei Li,Paul W. Leu +7 more
TL;DR: In this article, the parahydrophobicity and stick-slip wetting dynamics of vertically aligned carbon-nanotube (CNT) forests were investigated and compared with previously observed droplet infiltration characteristics.
Journal ArticleDOI
Accessibility of the pores in highly porous alumina films synthesized via sequential infiltration synthesis
Yunlong She,Jihyung Lee,Benjamin T. Diroll,Thomas W. Scharf,Elena V. Shevchenko,Diana Berman +5 more
TL;DR: An ultra-high accessibility of the pores in porous films prepared via polymer-swelling-assisted sequential infiltration synthesis (SIS) is reported and it is shown that highly porous alumina produced by polymer- Swell-assisted SIS is a promising candidate for sensing applications.
Journal ArticleDOI
Interfacial Tension Does Not Drive Asymmetric Nanoscale Electrowetting on Graphene
TL;DR: It is suggested that the molecular orientation properties are crucial to determine the asymmetric wetting behavior of pure water; in addition, the contrast in the strength of the ion hydration shells has a decisive influence on the NaCl solution behavior.
Journal ArticleDOI
Electrochemical Potential Stabilization of Reconstructed Au(111) Structure by Monolayer Coverage with Graphene.
TL;DR: The electrochemical properties of a monolayer graphene grown on a Au(111) electrode were studied using cyclic voltammetry (CV) and electrochemical scanning tunneling microscopy (EC-STM) to open a new branch of electrochemistry related to graphene/metal-electrolyte interfaces.
Journal ArticleDOI
Molecular dynamics simulation of a water nano-droplet on graphene oxide surface at high temperature: Evaporation or spreading?
Hojat Zahedi,Masumeh Foroutan +1 more
TL;DR: In this paper, the behavior of a water nano-droplet on hydrophilic graphene oxide (GO) is studied at high temperatures using molecular dynamics simulation, and the results showed that, with increasing temperature, spreading would overcome the evaporation of water molecules on the surface of GO.
References
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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.