The Surface Photovoltage and Gas Sensitive Properties of 7,7,8,8-Tetracyanoquinodimethane

Abstract

Abstract: In this paper, the surface photovoltage technique (SPV) was applied to the study of the pho-tovoltic and gas sensitive properties of 7,7,8,8-tetracyanoquinodimethane polycrystal. It was found that SPVshowed two peaks at 390 nm(P₁) and 480 nm(P₂) in the ultraviolet-visible region, and they are opposite in phase. The results of gaseous adsorption reveals that P₁ shows a characteristics of acceptor, while P₂ shows that of donor. During the adsorption, the donor gas interacts with conjugate H^* orbital, while the acceptor gas with C≡Nradical.

Key words: Surface photovoltage, Gas sensitive, Adsorption

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Jiang Lei, Wang De-jun, Liu Wang, Chai Xiang-dong, Li Tie-jin . The Surface Photovoltage and Gas Sensitive Properties of 7,7,8,8-Tetracyanoquinodimethane[J]. Chem. J. Chinese Universities, 1990, 11(12): 1419.

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The Surface Photovoltage and Gas Sensitive Properties of 7,7,8,8-Tetracyanoquinodimethane

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