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《Journal of Synthetic Crystals》 2006-06
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Nucleation and Growth Kinetics of CdS Nanocrystals Synthesized in Non-coordinating Solvent

LIU Guo-yong,ZHANG Jian-cheng,SHEN Yue,LUO Yu,JIANG Shu-tao(Department of Electronic Information Materials,Shanghai University,Shanghai 200072,China)  
CdS nano-crystals were synthesized in octadecanoic olefin system,a non-coordinating solvent,using cadmium oxide as Cd precursors,sulfur powder as S precursors and oleic acid as capping agent.The effects of oleic acid concentration on growth kinetics,size and size dispersion were investigated through changing the oleic acid concentration in the reaction system.In this study,the diameters of CdS nanocrystals varied from 2.2 to 4.5nm,and the corresponding fluorescence emission peaks lied in 390 to 450 nm,respectively.When the concentration of oleic acid is as high as 287mM at the moment of 60min after sulfur precursor injection,the average diameter of obtained nanocrystals could reach 4.5nm,and the actual nucleation concentration was only 10~(-5)M.When the oleic acid concentration was decreased to 42mM,the actually nucleation concentration of CdS nanocrystals was about 8×10~(-5)M.The nanocrystals of 2.2nm diameter could be obtained during the initial of nucleation.The results indicate that the initial nucleation rate speeds up significantly with the oleic acid concentration increasing.The higher oleic acid concentration in the reaction system is,the larger the size of resulted nanocrystals.Nevertheless,the nucleation number is less,but the size distribution is broader in the solution with high oleic acid concentration than ones with low oleic acid concentration.
【Fund】: 国家自然基金(No.90206017)资助项目
【CateGory Index】: O614.242
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