7,7,8,8-四氰基对苯醌二甲烷的光伏-气敏特性

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

用表面光电压谱技术研究了7,7,8,8-四氰基对苯醌二甲烷多晶的光伏-气敏特性。结果表明,在较高真空度条件下,该化合物有两类不同的表面光电压响应峰,分别位于390 nm(P_1)和480 nm(P_2)。探针气体吸附证明,P_1表现出较强的受体性,而P_2则显示出给体性质。给体性分子与该化合物的∏键轨道作用,而受体分子与其C≡N端基作用。

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 SPV showed 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=N radical.