Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
報文
Studies on Reaction Conditions for Size-selective Photoetching of Cadmium Telluride Nanocrystals
Taro UEMATSUTsukasa TORIMOTOSusumu KUWABATA
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2010 年 78 巻 2 号 p. 170-174

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Effects of reaction conditions on size-selective photoetching of CdTe nanocrystals were presented focusing on electron mediator and wavelength of irradiating light. Methyl viologen, which was expected to work as an electron mediator of photo-induced oxygen reduction accelerating the photoetching, decreased significantly the rate of the reaction. The results are compared with the photoetching of CdS nanocrystals in terms of overpotential for oxygen reduction and adsorption of electron mediators on nanocrystals. Under optimized conditions, the photoetching can produce highly monodispersed nanocrystals having fluorescence peak of fwhm value as small as 23.5 nm around the wavelength region where CdTe nanocrystals are stably produced by the conventional synthesis. However, further blue shifts of irradiating light gradually increased the fluorescence fwhm value, and the exciton peaks became unclear as well. The results were considered by comparing with recently reported magic-sized nanoclusters.

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© 2010 The Electrochemical Society of Japan
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