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Indexed by:期刊论文

Date of Publication:2009-11-01

Journal:HELVETICA CHIMICA ACTA

Included Journals:SCIE、EI、Scopus

Volume:92

Issue:11

Page Number:2249-2256

ISSN No.:0018-019X

Abstract:Water-soluble thioglycolic acid (TGA)-capped CdTe quantum dots (QDs) were synthesized in aqueous medium, and then encapsulated in a silica nanosphere by copolymerization of the TGA-capped CdTe conjugated with (3-aminopropyl)triethoxysilane (APS-CdTe conjugate), free (3-aminopropyl)triethoxysilane (=3-(triethoxysilyl)propan-1-amine; APS), and tetraethyl orthosilicate (TEOS) in a H(2)O-in-oil reverse microemulsion consisting of Triton X-100, octanol, cyclohexane, and H(2)O in the presence of aqueous NH(3) solution. The characterizations by transmission electron microscopy (TEM) and luminescence spectroscopy shows that the luminescent nanoparticles are monodisperse, spherical, and uniform in size, ca. 50 nm in diameter with a regular core - shell structure. In addition, primary amino groups directly introduced to the nanoparticle's surface by using free APS in the nanoparticle preparation enable the nanoparticles to be used easier as a biolabel. The effects of pH and metal cations on the luminescence of the nanoparticles also suggest that the new nanoparticles could be useful probes for luminescent sensings of pH and Cu(2+) ion.