A Study of Solid Surface Acid by Surface Photovoltage Spectrometry

Abstract

Abstract: The information of solid surface states can be obtained sensitively by measuring the surface photovoltage relating to the sub-bandgap transition. And a solid surface acid is related to the acceptor type surface states. In this paper, the surface photovoltage spectra of some zeolites and heteropolyacids were measured by sub-bandgap light. Is is found that there are acceptor type surface states at 900～1500 nm. The peak position corresponds to the energy level position of the surface states representing their acid strength; the peak strength corresponds to the surface state density indicating their acid amount. Finally, the experiment results are discussed theoretically.

Key words: Surface photovoltage spectra, Solid acid and bases, Surface state, Zeolite, Heteropolyacid

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Wang Dejun, Feng Shouhua, Liu Wang, Xiao Liangzhi, Li Tiejin . A Study of Solid Surface Acid by Surface Photovoltage Spectrometry[J]. Chem. J. Chinese Universities, 1990, 11(11): 1240.

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A Study of Solid Surface Acid by Surface Photovoltage Spectrometry

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