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Hydrothermal Synthesis and Fluorescence Properties of AgInS2/ZnS Core/Shell Quantum Dots
Author NameAffiliationE-mail
CHEN Ting School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen, Jiangxi 333001, China
National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen, Jiangxi 333001, China 		chenting@jci.edu.cn 
HU Xiao-Bo School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen, Jiangxi 333001, China
College of Materials Science and Engineering, Donghua University, Shanghai 201620, China 		 
XU Yan-Qiao School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen, Jiangxi 333001, China  
WANG Lian-Jun National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen, Jiangxi 333001, China
College of Materials Science and Engineering, Donghua University, Shanghai 201620, China 		 
JIANG Wan National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen, Jiangxi 333001, China
College of Materials Science and Engineering, Donghua University, Shanghai 201620, China 		 
JIANG Wei-Hui School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen, Jiangxi 333001, China
National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen, Jiangxi 333001, China 		 
XIE Zhi-Xiang School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen, Jiangxi 333001, China  
Abstract: Water-soluble AgInS2/ZnS (AIS/ZnS) core/shell quantum dots (QDs) were synthesized by hydrothermal method using thiourea (TU) as sulfur source, glutathione (GSH) and sodium citrate (SC) as ligands. The effects of reaction temperature and addition amount of ligands on the synthesis and fluorescence properties of AIS/ZnS QDs were systematically studied by XRD, TEM, UV-Vis absorption spectra and PL spectra, respectively, and their stability was also investigated. The results show that the emissive intensity of AIS/ZnS core/shell QDs is significantly improved by increasing the reaction temperature from 70 to 90℃. The increase of temperature promotes the growth of ZnS shell, on which the surface defects is effectively passivated. Meanwhile, the emissive peak showed a blue-shift from 600 nm to 580 nm. Furthermore, the ligands could balance the chemical reactivity of Zn2+, slow the growth rate of ZnS shell, inhibit the interface defects formation and eliminate the surface states. The AIS/ZnS core/shell QDs showed the strongest emission with nGSH/nZn2+ of 2.0 and nSC/nZn2+ of 2.5. Importantly, the obtained AIS/ZnS core/shell QDs exhibited excellent optical stability.
Keywords: quantum dot  hydrothermal synthesis  core-shell structure  emissive intensity  stability
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CHEN Ting,HU Xiao-Bo,XU Yan-Qiao,WANG Lian-Jun,JIANG Wan,JIANG Wei-Hui,XIE Zhi-Xiang.Hydrothermal Synthesis and Fluorescence Properties of AgInS2/ZnS Core/Shell Quantum Dots[J].Chinese Journal of Inorganic Chemistry,2020,36(1):69-78.
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Chinese Journal of Inorganic Chemistry