Abstract
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°C for 2 h, the photoluminescence was kept constant. Then, after annealing at 200°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.
Keywords: Luminescence, stability, CdSe, SiO2, annealing, illumination
Current Nanoscience
Title: Luminescence Stability of the Silica Encapsulated CdSe Quantum Dots
Volume: 4 Issue: 1
Author(s): Xingping Zhou, Xiaqin Wang, Fuxian Liu, Zhilong Chen and Atsuo Kasuya
Affiliation:
Keywords: Luminescence, stability, CdSe, SiO2, annealing, illumination
Abstract: 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°C for 2 h, the photoluminescence was kept constant. Then, after annealing at 200°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.
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Cite this article as:
Zhou Xingping, Wang Xiaqin, Liu Fuxian, Chen Zhilong and Kasuya Atsuo, Luminescence Stability of the Silica Encapsulated CdSe Quantum Dots, Current Nanoscience 2008; 4 (1) . https://dx.doi.org/10.2174/157341308783591870
DOI https://dx.doi.org/10.2174/157341308783591870 |
Print ISSN 1573-4137 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-6786 |
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