1997 Volume 18 Issue 6 Pages 332-341
Surface vibrational spectroscopies provides us the useful information on chemisorption states on diamond surfaces. We have investigated hydrogen and oxygen chemisorption states on diamond surfaces by two different vibrational spectroscopies; (i) Fourier-transform Infrared (FTIR) and (ii) High-resolution Electron Energy Loss Spectroscopy (HREELS). Diffuse reflectance FTIR is effective for powder diamond samples with large surface areas. Diffuse reflectance FTIR clarified detailed chemisorption structures of hydrogen and oxygen on powdered polycrystalline diamond surfaces. H-D exchange reaction and oxidation on diamond surfaces were conducted in reactant gas environments by the diffuse reflectance FTIR. HREELS is a powerful technique to observe the species on single crystal diamond surfaces with small surface areas. HREELS revealed a characteristic feature of hydrogen chemisorption on (100) and (111) diamond surfaces. In this review, we report the two different vibrational spectroscopies as techniques to study diamond surface reactions and their mechanisms.
