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Preparation and Optical Properties of CdTe/CdO-nH2O Core/shell Nano-composites in Aqueous Solution
Xiao Zhang, Xing-ping Zhou*, Si-yu Ni, Guo-liang Dai, Yin-sheng Wang
Author NameAffiliationE-mail
Xiao Zhang Institute of Biological Sciences and Biotechnology, Donghua University, Shanghai 201620, China; College of Material Science and Engineering, Donghua University, Shanghai 201620, China;  
Xing-ping Zhou* Institute of Biological Sciences and Biotechnology, Donghua University, Shanghai 201620, China xpzhou@dhu.edu.cn;dspr@imech.ac.cn 
Si-yu Ni Institute of Biological Sciences and Biotechnology, Donghua University, Shanghai 201620, China  
Guo-liang Dai National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China  
Yin-sheng Wang Institute of Biological Sciences and Biotechnology, Donghua University, Shanghai 201620, China  
Abstract:
"The deposition of CdO?nH2O on CdTe nanoparticles was studied in an aqueous phase. The CdTe nanocrystals (NCs) were prepared in aqueous solution through the reaction between Cd2+ and NaHTe in the presence of thioglycolic acid as a stabilizer. The molar ratio of the Cd2+ to Te2- in the precursory solution played an important role in the photoluminescence of the ultimate CdTe NCs. The strongest photoluminescence was obtained under 4.0 of [Cd2+]/[Te2-] at pH?8.2. With the optimum dosage of Cd(II) hydrous oxide deposited on the CdTe NCs, the photoluminescence was enhanced greatly. The photoluminescence of these nanocomposites was kept constant in the pH range of 8.0-10.0, but dramatically decreased with an obvious blue-shifted peak while the pH was below 8.0. In addition, the photochemical oxidation of CdTe NCs with cadmium hydrous oxide deposition was markedly inhibited."
Key words:  CdTe, Cadmium hydrous oxide, Optical properties, Surface modification, pH, Stability
FundProject:
CdTe/CdO nH2O核壳纳米复合粒子的水相合成及光学特性.
张霄,周兴平*,倪似愚,戴国亮,王寅生
摘要:
"研究了CdTe/CdO?nH2O核壳纳米复合物的水相合成及其光学特性. 以巯基乙酸为稳定剂通过氯化镉和碲氢化钠反应制备了碲化镉纳米晶. 在反应过程中, 反应前驱溶液中镉离子与碲离子的摩尔浓度比对最终制备的碲化镉纳米晶的荧光强度起到了极其重要的作用. 在pH值为8.2, 镉离子与碲离子摩尔浓度比为4.0的情况下,制备出了具有最强荧光强度的碲化镉量子点.之后,CdTe/CdO?nH2O核壳纳米复合物在水相中制备出来.在适当的氢氧化镉沉积在碲化镉纳米粒子表面后,碲化镉量子点的荧光大大增强.所制备的CdTe/C
关键词:  荧光性能,CdTe,CdTe/CdO?nH2O核壳纳米复合物,表面修饰,pH,稳定性
DOI:10.1088/1674-0068/20/06/779-783
分类号: