Journal article
CdSe/CdS/SiO2 core/shell/shell nanoparticles
Journal of nanoscience and nanotechnology, Vol.7(7), pp.2343-2348
07/2007
Handle:
https://hdl.handle.net/2376/106565
PMID: 17663250
Abstract
Quantum dots (QD) of a CdSe-ZnS core-shell structure are coated with silica spheres to improve their stability in biological buffers and biocompatibility in fluorescence imaging. We found that it was critical to transfer quantum dots from organic phase to aqueous phase before the silica shell growth process. As a result, high quality CdSe-ZnS-SiO2 core-shell-shell nanoparticles were prepared in high yields and their size and distribution are characterized with transmission electron microscopy and dynamic light scattering, which yielded uniform sizes and narrow polydispersity. Single particle fluorescence spectroscopy on the silica-protected quantum dots showed they were stronger emitters with consistent fluorescence intensity and "on-off" behaviors than bare CdSe-ZnS nanocrystals.
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Details
- Title
- CdSe/CdS/SiO2 core/shell/shell nanoparticles
- Creators
- Ming-Qiang Zhu - Department of Chemistry, Washington State University, Pullman, WA 99163, USAJason J HanAlexander D Q Li
- Publication Details
- Journal of nanoscience and nanotechnology, Vol.7(7), pp.2343-2348
- Academic Unit
- Chemistry, Department of
- Publisher
- United States
- Grant note
- GM065306 / NIGMS NIH HHS
- Identifiers
- 99900547052501842
- Language
- English
- Resource Type
- Journal article