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Surface Chemical Modification of Carbon Nanowalls for Wide‐Range Control of Surface Wettability
Author(s) -
Watanabe Hitoshi,
Kondo Hiroki,
Hiramatsu Mineo,
Sekine Makoto,
Kumar Shailesh,
Ostrikov Kostya,
Hori Masaru
Publication year - 2013
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.201200141
Subject(s) - wetting , contact angle , materials science , surface modification , graphene , chemical engineering , carbon nanotube , nanotechnology , carbon fibers , surface energy , electrode , analytical chemistry (journal) , composite material , chromatography , chemistry , composite number , engineering
Carbon nanowalls (CNWs) are self‐assembled, free‐standing, few‐layered graphenenano‐structures with large surface area, and thin graphene edges. For their application to nanobiotechnology, the effects of chemisorbed species on surface wettability were investigated. The surfaces of as‐grown CNWs obtained using CH 4 /H 2 mixture were hydrophilic. After Ar atmospheric pressure plasma treatments for up to 30 s, the contact angles of water droplets on the CNWs decreased from 51° to 5°, owing to a result of oxidation only at edges and surface defects. They increased up to 147° by CF 4 plasma treatment at low pressure. The wide‐range control of surface wettability of CNWs was realized by post‐growth plasma treatments. We also demonstrated detection of bovine serum albumin using surface‐modified CNWs as electrodes.