Synthesis, optical properties and growth process of In2S3 nanoparticles

Jiajia Ning; Kangkang Men; Guanjun Xiao; Liyan Zhao; Li Wang; Bingbing Liu; Bo Zou

doi:10.1016/j.jcis.2010.03.053

Synthesis, optical properties and growth process of In2S3 nanoparticles

J Colloid Interface Sci. 2010 Jul 15;347(2):172-6. doi: 10.1016/j.jcis.2010.03.053. Epub 2010 Mar 29.

Authors

Jiajia Ning¹, Kangkang Men, Guanjun Xiao, Liyan Zhao, Li Wang, Bingbing Liu, Bo Zou

Affiliation

¹ State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.

PMID: 20399446
DOI: 10.1016/j.jcis.2010.03.053

Abstract

Cubic beta-In(2)S(3) nanoparticles (NPs) have been synthesized by a simple and facile way, which is 6 nm in size. Absorption and emission spectra of In(2)S(3) NPs show obvious blue peak shift compared to band gap of bulk In(2)S(3), indicating the strong quantum size confinement effect. The fluorescence quantum yield of In(2)S(3) NPs is found to be 10%. During the synthesis process, the absorption spectra have no peak shift, which is responding to transition from valence band to the conduction band levels. This absorption spectra show that the nucleation and growth process of In(2)S(3) NPs is very quick. The PL lifetime spectra and time resolved spectra give two emission processes in In(2)S(3) NPs, which would be excitonic recombination and electron-hole recombination via defects levels. The blue shift of emission peaks show the emission process in In(2)S(3) NPs is from mainly electron-holes recombination via defects levels to excitonic recombination. The Stokes shift becomes smaller which is mainly contributed by blue shift of emission and smaller contribution from the UV-Vis absorption. The absorption and emission spectra show the size and crystallinity of In(2)S(3) NPs have no changes (HRTEM images provide enough proofs); however the surface-related defects changed greatly in the reaction process.