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Fabrication and characterization of CdSe/ZnS quantum dots-doped polystyrene microspheres prepared by self-assembly

Published online by Cambridge University Press:  17 October 2012

Yu-Hsiang Lee ,
Ching-Shiow Tseng  and
Yen-Lin Wei
Yu-Hsiang Lee*
Affiliation:
Graduate Institute of Biomedical Engineering, National Central University, Taoyuan 32001, Taiwan, Republic of China
Ching-Shiow Tseng
Affiliation:
Graduate Institute of Biomedical Engineering, National Central University, Taoyuan 32001, Taiwan, Republic of China; and Department of Mechanical Engineering, National Central University, Taoyuan 32001, Taiwan, Republic of China
Yen-Lin Wei
Affiliation:
Graduate Institute of Biomedical Engineering, National Central University, Taoyuan 32001, Taiwan, Republic of China
*
a)Address all correspondence to this author. e-mail: yuhsianl@ncu.edu.tw
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Abstract

Semiconductor quantum dots (QDs)-doped polystyrene (PS) microspheres with high luminescence were prepared using a self-assembly approach. Hydrophobic CdSe/ZnS QDs were first carboxylized by ligand exchange using mercaptocarboxylic acid. PS microspheres were separately encapsulated with polyethyleneimine via electrostatic interactions and then adsorbed with the carboxyl QDs to form QDs-doped microspheres. We then characterized the combinations using optical, electrical, and mechanical approaches and obtained the following findings: (i) microspheres can be fully coated by QD nanoparticles with a coverage rate of 1.0 pmole/cm2, in which QDs were evenly distributed on the surfaces; (ii) the anchored QDs exhibited similar optical property as they performed in isolated suspension; and (iii) the fluorescence of QDs-doped microspheres remained intact after stressed by ultrasound-induced cavitation, demonstrating the robustness of interactions between QDs and microspheres. The self-assembly approach developed in this study offered a facile and controllable strategy for preparation of QDs-encoded microparticles with high luminescence and stability.

Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 22 , 22 November 2012 , pp. 2829 - 2836
Copyright
Copyright © Materials Research Society 2012

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