Surface reforming of the oxidized diamond surface with silane coupling reagents

Toshiki Tsubota, Shintaro Ida, Osamu Hirabayashi, Shoji Nagaoka, Sanpei Nagayama, Masanori Nagata, Yasumichi Matsumoto

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Abstract

Diamond surface reforming was carried out using various silane coupling reagents (n-octyltrimethoxysilane, 3-aminopropyltrimethoxysilane, or 3-mercaptopropyltrimethoxysilane). In order to introduce the O-H group, which reacts with the methoxy group in the silane coupling reagents, on the diamond surface, hydrogenated diamond surfaces were treated with mineral acids (H2SO4, H2SO4 + HNO3, or aqua regia). The diamond powders treated with H2SO4 or H2SO4 + HNO3 were utilized as the diamond substrate for the reaction with the silane coupling reagents. After the treatment with the silane coupling reagents, peaks assigned to the chemical bonds in the silane coupling reagents appeared in the IR spectrum of the diamond powders. Moreover, these peaks remained even after washing 3 times with organic solvents. The oxidized diamond surface was changed from hydrophilic to hydrophobic upon treatment with n-oetyltrimethoxysilane. From the results of this study, it was confirmed that the silane coupling reagent is effective for the surface reforming of diamond treated with mineral acid.

Original languageEnglish
Pages (from-to)904-910
Number of pages7
JournalJournal of the Ceramic Society of Japan
Volume110
Issue number1286
DOIs
Publication statusPublished - Jan 1 2002

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

Tsubota, T., Ida, S., Hirabayashi, O., Nagaoka, S., Nagayama, S., Nagata, M., & Matsumoto, Y. (2002). Surface reforming of the oxidized diamond surface with silane coupling reagents. Journal of the Ceramic Society of Japan, 110(1286), 904-910. https://doi.org/10.2109/jcersj.110.904