Surface Features of Submicron-Sized Diamond -Effects of Adsorbed Oxygen-
Hiroshi YAMANAKA and Satoru HOSOMI
Abstract:Submicron-sized diamond particles having hydrophilic groups on the surface were heated either in an atmosphere of hydrogen or inert gas. The surface variation of the diamond during heating was observed by means of TG-mass spectrometry and TEM obsavation. The hydrophilic diamond particles had an atoms-deep disordered zone near the outer surface. This structure was not affected significantly by heating in hydrogen at 1473K, while it increased significantly in depth after heating in nitrogen at 1473K. It is thus estimated that the removal of oxygen or oxygen-containing functional group could trigger the graphitization of the surface of diamond. Key Words:Submicron-sized diamond, Hydrophilic surface, Specific surface area, Adsorbed oxygen, Graphitization