染料吸附对氯化银微晶表面结构的影响

Influences of Dye Adsorption on Surface Structure of AgCl Cubic Microcrystal

利用微波吸收相敏检测技术测量了纯氯化银微晶的光电子衰减曲线,再结合光电子衰减动力学方程,确定了微晶表面和内部的电子陷阱参数,并以此为基础分析了染料的吸附对微晶表面结构的影响。发现吸附不仅会在微晶表面产生填隙银离子同时会对表面陷阱产生修饰作用,且随着染料吸附量的减少,产生银离子的作用退化并最终消失,而修饰作用凸现并逐渐增强,直至填隙银离子不再产生,修饰作用也达到了最大,随后修饰作用将随染料吸附量的继续减少而变弱。

The spectrum of the photoelectron decay in the AgCI microcrystal was measured by microwave absorption dielectric spectrum technique, combining the equation of photoelectron decay dynamics, the parameters of electron traps which were in the surface and inner of the microcrystal were determined. Then the influences of dye adsorption on surface structure of microcrystal were analyzed. It is found that not only the interstitial silver ions are produced but also the traps in the surface of microcrystal are modified when the dye is adsorbed to the surface of microcrystal. Along with the decrease of dye, the first function degenerates and disappears at last, while the second one appears and boosts up to the most until the interstitial silver no longer appear. Then with the decrease of dye the second function begins die down.