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Understanding controls on interfacial wetting at epitaxial graphene: Experiment and Theory
Journal article   Open access   Peer reviewed

Understanding controls on interfacial wetting at epitaxial graphene: Experiment and Theory

Hua Zhou, Panchapakesan Ganesh, Volker Presser, Matthew C Wander, Paul Fenter, Paul R Kent, Deen Jiang, Ariel A Chialvo, John Mcdonough, Kevin L Shuford, …
Physical review. B, Condensed matter and materials physics, v 85(3)
01 Jan 2012
DOI: https://doi.org/10.1103/PhysRevB.85.035406
url
https://doi.org/10.1103/PhysRevB.85.035406View
Published, Version of Record (VoR) Open

Abstract

BUFFERS EPITAXY DEFECTS CARBON REFLECTIVITY SUBSTRATES RESOLUTION CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY THICKNESS WATER
The interaction of interfacial water with graphitic carbon at the atomic scale is studied as a function of the hydrophobicity of epitaxial graphene. High resolution x-ray reflectivity shows that the graphene-water contact angle is controlled by the average graphene thickness, due to the fraction of the film surface expressed as the epitaxial buffer layer whose contact angle (contact angle c = 73 ) is substantially smaller than that of multilayer graphene ( c = 93 ). Classical and ab initio molecular dynamics simulations show that the reduced contact angle of the buffer layer is due to both its epitaxy with the SiC substrate and the presence of interfacial defects. This insight clarifies the relationship between interfacial water structure and hydrophobicity, in general, and suggests new routes to control interface properties of epitaxial graphene.

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Collaboration types
Domestic collaboration
Web of Science research areas
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
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