Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 16, Issue 14, Pages 4266-4272Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200901823
Keywords
aggregation-induced emission; cell imaging; fluorescence; nanoparticles; sol-gel reaction
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Funding
- Hong Kong Research Grants Council [603008 HKUST13/CRF/08, 602706]
- National Science Foundation of China [20974028, 20634020]
- University Grants committee of Hong Kong [AoE/P-03/08]
- Ministry of Science Technology [200903623605]
- Cao Guangbiao Foundation of Zhejiang University
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Highly emissive inorganic organic nanoparticles with core shell structures are fabricated by a one-pot, surfactant-free hybridization process. The surfactant-free sol gel reactions of tetraphenylethene- (TPE) and silole-functionalized siloxanes followed by reactions with tetraethoxysilane afford fluorescent silica nanoparticles FSNP-1 and FSNP-2, respectively. The FSNPs are uniformly sized, surface-charged and colloidally stable. The diameters of the FSNPs are tunable in the range of 45-295 nm by changing the reaction conditions. Whereas their TPE and silole precursors are non-emissive, the FSNPs strongly emit in the visible vision, as a result of the novel aggregation-induced emission (AIE) characteristics of the TPE and silole aggregates in the hybrid nanoparticles. The FSNPs pose no toxicity to living cells and can be utilized to selectively image cytoplasm of HeLa cells.
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