Luminescence stability of the silica encapsulated CdSe quantum dots

被引：9
|
作者：
Zhou, Xingping [1 ,3 ]
Wang, Xiaqin [2 ]
Liu, Fuxian [1 ]
Chen, Zhilong [1 ]
Kasuya, Atsuo [3 ]
机构：
[1] Donghua Univ, Inst Biol Sci & Biotechnol, Shanghai 201620, Peoples R China
[2] Donghua Univ, Coll Mat Sci & Engn, Shanghai 201620, Peoples R China
[3] Tohoku Univ, Ctr Interdisciplinary Res, Sendai, Miyagi 9808578, Japan
来源：
CURRENT NANOSCIENCE | 2008年 / 4卷 / 01期
关键词：
luminescence; stability; CdSe; SiO2; annealing; illumination;
D O I：
10.2174/157341308783591870
中图分类号：
Q81 [生物工程学（生物技术）]; Q93 [微生物学];
学科分类号：
071005 ; 0836 ; 090102 ; 100705 ;
摘要：
Silica encapsulated CdSe quantum dots (QDs) with a relatively strong photoluminescence were prepared using 3-mercaptopropyl trimethoxysilane by Stober method at room temperature. The effect of pH of the physiological saline on the photoluminescence was investigated while the nanocomposites were dispersed in it. The results show a comparatively high stability of the luminescence. The thermal stability of the photoluminescence of the composite nanoparticles was also studied. After annealing at 60 degrees C for 2 h, the photoluminescence was kept constant. Then, after annealing at 200 degrees C for 2 h, the photoluminescence was promoted by over 10 times with a marked blue-shifted emission. In addition, the stabilization of the core-shell structured composites against the intense illumination was investigated through the transmission electron microscopy (TEM) observation and the luminescence measurement.
引用
收藏
页码：88 / 91
页数：4
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