Changes in wettability of carbon nanowalls by oxygen plasma treatment

Changes in wettability of carbon nanowalls (CNWs) by oxygen plasma treatment were investigated. Detailed analysis suggests that the changes in wettability of CNW from hydrophobicity to hydrophilicity by oxygen plasma treatment were mainly caused by the formation of hydrophilic nature on the CNW surface. An evaluation technique of penetration of an aqueous solution into CNW structure was also introduced in this paper. By using this technique, it was revealed that the aqueous solution penetrated into the gaps between walls for CNW samples treated by oxygen plasma. (c) 2019 The Japan Society of Applied Physics