Highly Fluorescent CdTe@SiO₂ Particles Prepared via Reverse Microemulsion Method

Abstract

Following on from our previous investigations, fluorescent core/shell CdTe@SiO 2 particles were prepared via the water-in-oil (W/O) reverse microemulsion method. It was found out that incubating the as-prepared aqueous CdTe quantum dots stabilized by thioglycolic acid in ammoniacal solution not only increased the fluorescence quantum yield of CdTe quantum dots but also gave rise to high retention of fluorescence throughout the silica coating. Under optimized conditions, the fluorescence quantum yield of CdTe quantum dots encapsulated in silica particles reached 47%. Both absorption and fluorescence spectroscopy were used in combination with X-ray photoelectron spectroscopy and electrophoresis to investigate the fluorescence enhancement effect occurring during incubation, the high retention of fluorescence quantum yield, as well as the formation of multicore/shell CdTe@SiO 2 particles as a result of the incubation process imposed on the as-prepared CdTe quantum dots.

Ultra-small fluorescent inorganic nanoparticles for bioimaging

“…In comparison with incubated CdTe QDs (83%), nearly 40% of the fluorescence was still lost during silica coating. 71 The formation of single-dot@SiO 2 nanoparticles is attributed to the electrostatic 80 repulsion between QDs and silica intermediates.…”

Hierarchical assembly of CdS nanoparticles in polymer particles with phase separation structures

“…3 These quantum dots (QDs) show strong fluorescence, and their absorption and fluorescence profiles can be controlled by changing their sizes. [4][5][6][7] These properties allow for a wide variety of practical applications, including imaging probes, 8 sensors 9 and solar cells. 10 Recently, precise control of QD arrangements has attracted considerable interest because periodically arranged QDs can be used as a QD laser, 11 which functions with a pumping light of very low threshold power.…”

VCAM-1-targeted core/shell nanoparticles for selective adhesion and delivery to endothelial cells with lipopolysaccharide-induced inflammation under shear flow and cellular magnetic resonance imaging in vitro

“…Other studies have shown that the magnetic core can be replaced by semiconductor quantum dots or fluorescence molecules doped into the silica shell to form fluorescent core/shell silica nanoparticles. [9][10][11] These silica-coated fluorescent magnetic nanoprobes enabled development of biomedical platforms for simultaneous imaging, diagnosis, and therapy. [12][13][14] However, it is still a challenge to fabricate fluorescent magnetic nanoprobes with high photostability, high payloads of dye, and desirable outer surfaces for further modification with functional or target moieties.…”