Preparation and characterization of ZnS:Fe/MX (M = Cd, Zn; X = S, Se) core-shell nanocrystals

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• 作者：Lihua Li^a ; ^b ; Ruishi Xie^b ; Yongjun Gu^a ; Jinliang Huang^a ; Jianguo Zhu^b ; ^{nic0400@scu.edu.cn}
• 关键词：ZnS ; Fe/MX nanocrystals ; Chemical precipitation method ; Luminescent properties
• 刊名：Applied Surface Science
• 出版年：2012
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：1 June, 2012
• 卷：258
• 期：16
• 页码：5992-5995
• 文件大小：512 K

摘要

ZnS:Fe/MX (M = Cd, Zn; X = S, Se) nanocrystals were synthesized by chemical precipitation method. Compared to ZnS:Fe nanocrystals, the diffraction peaks intensity of ZnS:Fe/ZnS nanocrystals reduced and the diffraction peaks of ZnS:Fe/ZnSe nanocrystals moved to lower angles. TEM photos show that ZnS:Fe and ZnS:Fe/ZnSe nanocrystals are spheroidal and the average particles size is about 2-4 nm. The selected-area electron diffraction pattern of ZnS:Fe/ZnSe nanocrystals shows the diffraction rings, indicating the ZnS:Fe/ZnSe nanocrystals have a polycrystalline structure. XPS shows that the divalent and trivalent of Fe ion are coexisted in ZnS:Fe nanocrystals. The emission peaks of ZnS:Fe nanocrystals were from S and Zn ions vacancy defects and surface defects for the range of 200-900 nm. The use of ZnS (CdS, ZnSe) as surface modifying reagent inhibited the luminescent intensity of ZnS:Fe nanocrystallines at 420 nm. The PL spectra of ZnS:Fe/CdS nanocrystals show a new peak at 554 nm.