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Synthesis of In2O3@SiO2 core-shell nanoparticles with enhanced deeper energy level emissions of In2O3.

Langmuir : the ACS journal of surfaces and colloids (2011-10-21)
Yiping Fang, Welley S Loc, Weigang Lu, Jiye Fang
ABSTRACT

In(2)O(3)@SiO(2) core-shell nanoparticles were prepared using an organic solution synthesis approach and reverse-microemulsion technique. In order to explore the availability of various silica encapsulations, a partial phase diagram for this ternary system consisting of hexane/cyclohexane (1:29 wt), surfactant (polyoxyethylene(5)nonylphenyl ether, i.e., Igepal CO-520), and aqueous solution containing ammonium hydroxide was also established. It is realized that the shell-thickness can be tuned by several parameters such as the concentration of In(2)O(3) nanocrystal suspension and the dose of the Si-precursor, tetraethyl orthosilicate. It was observed that the deeper energy level emissions of In(2)O(3) were apparently enhanced when In(2)O(3) was confined by the silica-shell in such core-shell nanoparticles. However, this enhancement could be degraded by increasing the shell-thickness.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Indium(III) oxide, 99.998% trace metals basis
Sigma-Aldrich
Indium(III) oxide, 99.99% trace metals basis
Sigma-Aldrich
Indium(III) oxide, nanopowder, <100 nm particle size (TEM), 99.9% trace metals basis