Xingping Zhoua*, Zhilong Chena, Peng Huanga, Xiaqin Wangb**, and Atsuo Kasuyac
a Institute of Biological Sciences and Biotechnology, Donghua University, North Renmin Road 2999,
Shanghai 201620, P. R. China
b College of Material Science and Engineering, Donghua University, Shanghai 201620, P.R. China
c Center for Interdisciplinary Research, Tohoku University, Aramaki aza Aoba, Sendai 980-8578, Japan
e-mails: *xpzhou@dhu.edu.cn, **xqwang@dhu.edu.cn
Received December 17, 2007
Abstract—Cadmium hydroxide-deposited cadmium selenide nanoparticles were prepared by the addition of
cadmium sulfate solution to cadmium selenide nanoparticles in a weak alkaline solution at room temperature.
The photoluminescence measurements displayed that the luminescence intensity was greatly increased by the
addition of cadmium ions due to the formation of cadmium hydroxide on the surfaces of the cadmium selenide
nanoparticles. Then, CdSe/Cd(OH)2/SiO2 nanocomposite particles were synthesized using 3-mercatopropyl
trimethoxysilane by Stöber method. After the formation of CdSe/Cd(OH)2/SiO2 nanocomposite particles, the
emission ability was mostly stabilized. Additionally, the stabilization of the composite particles against dilution
with the physiological saline was checked. The results showed that the photoluminescence stability was pro-
moted after the deposition of silica on the surfaces of the CdSe/Cd(OH)2 nanoparticles. Comparison of the sta-
bility of CdSe/SiO2 nanoparticles with that of CdSe/Cd(OH)2/SiO2 ones showed that Cd(OH)2 shell could
enhance the photoluminescence effectively.
DOI: 10.1134/S1061933X08060082
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