Thermal desorption spectra of hydrogenated and water treated diamond powders

✍ Scribed by S. Matsumoto; N. Setaka

• Publisher: Elsevier Science
• Year: 1979
• Tongue: English
• Weight: 518 KB
• Volume: 17
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(79)90038-1

✦ Synopsis

The thermal desorption mass spectra of hydrogenated and water treated diamond powders were measured in the range from room temperature to 1250°C. After preliminary outgassing up to 1150°C. samples were either hydrogenated under 1 Pa hydrogen at 500-IOOOY or treated in water vapor at room temperature to 800°C. Hydrogenated diamond exhibited two desorption peaks due to Hz at about 900 and 1050°C. while water treated one desorbed mainly H2 and CO, and small amounts of Hz0 and C02. Oxidation after hydrogenation and treatment with a mixture of hydrogen and oxygen showed some correlation between adsorption states of hydrogen and oxygen. The maximum amount of hydrogen desorbed (0.81 x lOI atom/cm*) was only one-third of the value estimated as full surface coverage.