シランカップリング剤による酸化ダイヤモンド表面の表面改質

概要

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Diamond surface reforming was carried out using various silane coupling reagents (n-octyltrimethoxysi lane, 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 (H_2SO_4, H_2SO_4 + HNO_3, or aqua regia). The diamond powders treated with H_2SO_4 or H_2SO_4 + HNO_3 were utilized as the diamond substrate for the reac tion with the silane coupling reagents. After the treatment with the silane coupling reagents, peaks as signed 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 di amond surface was changed from hydrophilic to hydrophobic upon treatment with n-octyltrimethoxysilane. 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.
2002-10-01