The optical effects of the adsorption of eosin on the colloidal sliver particle have been investigated in aqueous solutions. It was found that upon adsorption the fluorescence of eosin was effectively quenched. This w...The optical effects of the adsorption of eosin on the colloidal sliver particle have been investigated in aqueous solutions. It was found that upon adsorption the fluorescence of eosin was effectively quenched. This was explained as the photoinduced interfacial electron transfer from the excited singlet state of eosin to the silver particle. Decreasing pH of the solution favors the adsorption of eosin and so enhances the fluorescence quenching. For comparison, the fluorescence quenching in reverse micelles was also investigated. The quenching behavior was much different from that mediated in aqueous solution. This was attributed to the unique microenvironment of reverse micelles.展开更多
基金Project supported by the National Natural Science Foundation of China and Eastman Kodak Company.
文摘The optical effects of the adsorption of eosin on the colloidal sliver particle have been investigated in aqueous solutions. It was found that upon adsorption the fluorescence of eosin was effectively quenched. This was explained as the photoinduced interfacial electron transfer from the excited singlet state of eosin to the silver particle. Decreasing pH of the solution favors the adsorption of eosin and so enhances the fluorescence quenching. For comparison, the fluorescence quenching in reverse micelles was also investigated. The quenching behavior was much different from that mediated in aqueous solution. This was attributed to the unique microenvironment of reverse micelles.
