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
More filters
Journal ArticleDOI
Communication: Water on hexagonal boron nitride from diffusion Monte Carlo
Yasmine S. Al-Hamdani,Yasmine S. Al-Hamdani,Ming Ma,Ming Ma,Dario Alfè,Dario Alfè,O. Anatole von Lilienfeld,O. Anatole von Lilienfeld,Angelos Michaelides,Angelos Michaelides +9 more
TL;DR: Quantum Monte Carlo results for the adsorption of a water monomer on a periodic hexagonal boron nitride sheet are reported and used to evaluate the performance of several widely used density functional theory exchange correlation functionals and find that they all deviate substantially.
Journal ArticleDOI
Cleaning graphene: Comparing heat treatments in air and in vacuum
Mukesh Tripathi,Andreas Mittelberger,Kimmo Mustonen,Clemens Mangler,Jani Kotakoski,Jannik C. Meyer,Toma Susi +6 more
TL;DR: In this paper, a comparative analysis of annealing treatments in air and in vacuum, both ex situ and pre situ, where an ultra-high vacuum treatment chamber is directly connected to an aberration-corrected scanning transmission electron microscope, is presented.
Journal ArticleDOI
Highly Reversible and Recyclable Absorption under Both Hydrophobic and Hydrophilic Conditions using a Reduced Bulk Graphene Oxide Material
Huicong Chang,Jili Qin,Peishuang Xiao,Yang Yang,Tengfei Zhang,Yanfeng Ma,Yi Huang,Yongsheng Chen +7 more
TL;DR: A 3D crosslinked reduced bulk graphene oxide material with switchable absorption capability between hydrophobicity and hydrophilicity is achieved by a simple O3 and annealing treatment.
Journal ArticleDOI
Load-Dependent Friction Hysteresis on Graphene.
Zhijiang Ye,Philip Egberts,Gang Hee Han,A. T. Charlie Johnson,Robert W. Carpick,Ashlie Martini +5 more
TL;DR: It was found that only simulations with water at the tip-graphene contact reproduced the experimentally observed hysteresis, and the relationship between the size of the sliding interface and friction observed in the simulations was explained in terms of the varying contact angles in front of and behind the sliding tip, which were larger during loading than unloading.
Journal ArticleDOI
Nanoscale frictional behavior of graphene on SiO2 and Ni(111) substrates.
TL;DR: Analysis shows that Derjaguin-Mueller-Toporov model is in good agreement with the experimental data indicating that overall behavior of the interface graphene-Ni(111) is relatively rigid respect to out of plane deformations.
References
More filters
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.