Abstract
We report a new method for introducing carboxylic groups onto the diamond surface. Hydrogenated diamond surfaces were treated in a solvent containing benzoyl peroxide and dicarboxylic acid. Surface characterization was performed by diffuse reflectance infrared Fourier transform spectroscopy. After the reaction, a CO peak appeared, and the shape of the CH peak at 2780−2960 cm-1 depended on the kind of dicarboxylic acid. When deuterium-labeled diamond powders were treated in the same manner, aliphatic CH peaks were observed in the range 2780−2960 cm-1. The CH peaks were assigned to the (CH2)n groups of the dicarboxylic acids bonding to the diamond surface. When the modified diamond surfaces were treated with NaOH(aq), peaks assigned to the CO bond of the COONa groups appeared at 1578 cm-1, which indicated that carboxylic groups were present on the diamond surface. The presence of HOOC(CH2)nOCO groups on the diamond surface has been demonstrated.
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