【研究成果】2014年

研究成果72

Visualization of Electrochemical Reactions by Redox-dependent Quenching of Photoluminescence from ZnS-AgInS2 Solid Solution Semiconductor Nanoparticles
Taro UEMATSU, Yusuke KAJI, Tsukasa TORIMOTO, Susumu KUWABATA
Electrochemistry, 82(5), 338–340 (2014)

A new method to visualize electrochemical reactions by fluorescence is demonstrated by using the photoluminescence quenching of semiconductor nanoparticles which changes according to the redox states of quenchers. The photoluminescence intensity of ZnS-AgInS₂ solid solution semiconductor nanoparticles can be controlled by the electrochemical manipulation of quencher molecules. By using a fluorescence optical microscopy, the formation of Nernst diffusion layer is successfully observed as a photoluminescence intensity gradient.

Fluorescence microscopy images recorded with a setup illustrated above at the interface of Pt electrode and solution containing ZnS-AgInS₂ solid solution (ZAIS) NPs and quenchers: brightness variation when TMPDA is oxidized at +0.7 V (a), and when MP+ is reduced at -0.5 V (b).