Optical Properties of Silica-Encapsulated ZnSe Nanocrystals Prepared with Water-in-Oil Microemulsions
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概要
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Silica-encapsulated ZnSe nanocrystals (NCs) were prepared by a safe and simple synthesis method, utilizing a sodium bis (2-ethylhexyl) sulfosuccinate (AOT)/water/cyclohexane microemulsion system and characterized by UV--vis analysis, photoluminescence (PL) spectroscopy, and transmission electron microscopy (TEM). For the encapsulations, two reverse micellar solutions [one for tetraethyl orthosilicate (TEOS) and the other for ZnSe] containing different water volumes were employed. The size of silica particles containing ZnSe NCs could be controlled from 13--37 nm by varying the water content W (W=[\text{H_{2}O}]/[\text{AOT}]). On the other hand, the size of encapsulated ZnSe NCs was almost unchanged (about 2.5 nm) even though the size of the silica particles was increased. At W = 7, the maximum PL efficiency of 6% was obtained and the photostability was increased markedly after ZnSe NCs were encapsulated by silica.
- 2013-01-25
著者
-
Park Sang
Department Of Anatomy Seoul National University College Of Medicine
-
Kim Ji
Department of Advanced Materials Engineering, Sangju National University, Kyeongbuk 742-711, Korea
-
Liu Kang
Department of Chemical and Biological Engineering, Gachon University, Seongnam, Gyeonggi 461-701, Korea
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Kim Ji
Department of Chemical and Biological Engineering, Gachon University, Seongnam, Gyeonggi 461-701, Korea
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