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Title: Water-induced negative electron affinity on diamond (100)
Authors: Gao, X. 
Liu, L. 
Qi, D. 
Chen, S. 
Wee, A.T.S. 
Ouyang, T.
Loh, K.P. 
Yu, X. 
Moser, H.O. 
Issue Date: 21-Feb-2008
Citation: Gao, X., Liu, L., Qi, D., Chen, S., Wee, A.T.S., Ouyang, T., Loh, K.P., Yu, X., Moser, H.O. (2008-02-21). Water-induced negative electron affinity on diamond (100). Journal of Physical Chemistry C 112 (7) : 2487-2491. ScholarBank@NUS Repository.
Abstract: The interaction of water vapor on clean diamond (100) has been studied using ultraviolet photoemission spectroscopy (UPS), X-ray photoemission spectroscopy (XPS), X-ray-absorption near-edge structure (XANES) spectroscopy, and high-resolution electron energy loss spectroscopy (HREELS). It is shown that water dissociates at room temperature on clean diamond forming C-H and C-OH bonds, resulting in a surface dipole layer which produces the condition of negative electron affinity (NEA). The strong polarization dependence of the O K XANES could be associated with the out-of-plane orientation of the OH bonds. Density functional theory (DFT) calculations confirm the existence of NEA on this surface with a mixture of hydrogen and hydroxyl (OH) terminations. © 2008 American Chemical Society.
Source Title: Journal of Physical Chemistry C
ISSN: 19327447
DOI: 10.1021/jp0726337
Appears in Collections:Staff Publications

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