Synthesis and photoluminescence of In2O3 nanocrystals and submicron crystals from InCl3 center dot 4H2O and thiourea
作者：Zhang, Liu Xing，Zhang, Yong Cai，Zhang, Ming
關鍵字：Nanomaterials, Semiconductors, Crystal Growth, X-ray techniques
論文來源：期刊
具體來源：Materials Letters
發表時間：2010年
Two routes have been proposed for the synthesis of In2O3 powders from InCl3?4H2O and thiourea. One route involved a two-step procedure (that is, firstly, In2S3 clusters constructed with mainly nanoflakes were synthesized by heating the mixture of InCl3?4H2O and thiourea in air from room temperature to 200 °C, coupled with a subsequent washing treatment; secondly, In2O3 was obtained by calcining the In2S3 clusters in air at 600 °C for 6 h), and the other route was a one-step procedure (that is, In2O3 was synthesized directly by calcining the mixture of InCl3?4H2O and thiourea in air at 600 °C for 6 h). The resultant products were characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, scanning electronic microscope and room temperature photoluminescence (RT-PL) spectra. It was observed that the In2O3 nanocrystals obtained via the two-step procedure exhibited PL peaks at about 453 and 471 nm, corresponding to the defeat-related emission; while the In2O3 submicron polyhedral crystals obtained via the one-step procedure and In2O3pyramids obtained by calcining the only InCl3?4H2O in air at 600 °C for 6 h displayed a PL band centered at around 338 nm, corresponding to the band edge emission.