Abstract
Surface chemical reactions of hydrogen with diamond are important events in the complex processes leading to diamond chemical vapor deposition (CVD). Our ongoing research addresses the surface reactions related to diamond growth. Studies were performed on single crystals, C(100) and C(110), and large grained polycrystalline CVD diamond films using a diverse array of ultra-high vacuum surface analytical techniques. Surface vibrational spectroscopies, high resolution electron energy loss spectroscopy (HREELS) and multiple internal reflection infrared spectroscopy (MIRIRS), were principal probes of surface structure, while HREELS and temperature programmed desorption (TPD) were used to investigate hydrogen adsorption, abstraction, and desorption. We found: (1) the C(100), C(110) and polycrystalline diamond surfaces are terminated primarily with CH species; (2) the ratio of H atom abstraction to adsorption is 0.05 ± 0.01; (3) hydrogen desorbs molecularly from C(110) peaking at 892 C and exhibits first order desorption kinetics with an activation energy of 75 kcal/mole; and (4) both clean and hydrogen-saturated C(100) surfaces display a 2x1 surface reconstruction.
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Butler, J.E., Thoms, B.D., McGonigal, M., Russell, J.N., Pehrsson, P.E. (1995). Hydrogen Chemistry on Diamond Surfaces. In: Prelas, M.A., Gielisse, P., Popovici, G., Spitsyn, B.V., Stacy, T. (eds) Wide Band Gap Electronic Materials. NATO ASI Series, vol 1. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0173-8_11
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