Hydrophilization of graphite using plasma above/in a solution. (31st October 2017)

• Record Type: Journal Article
• Authors: Hoshino, Shuhei; Kawahara, Kazuma; Takeuchi, Nozomi
• Is Part Of: Japanese journal of applied physics. Volume 57:Number 1(2018)
• Publication Date: 2017-10-31
• Subjects: Physics -- Periodicals; 621.05
• DOI: 10.7567/JJAP.57.0102B1
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: A hydrophilization method for graphite is required for applications such as conductive ink. In typical chemical oxidation methods for graphite have the problems of producing many defects in graphite and a large environmental impact. In recent years, the plasma treatment has attracted attention because of the high quality of the treated samples and the low environmental impact. In this study, we proposed an above-solution plasma treatment with a high contact probability of graphite and plasma since graphite accumulates on the solution surface due to its hydrophobicity, which we compared with a so-called solution plasma treatment. Graphite was hydrophilized via reactions with OH radicals generated by the plasma. It was confirmed that hydroxyl and carboxyl groups were modified to the graphite and the dispersibility was improved. The above-solution plasma achieved more energy-efficient hydrophilization than the solution plasma and it was possible to enhance the dispersibility by increasing the plasma–solution contact area.