用硫乙酰胺合成尺寸可控的ZnO纳米粒子及ZnS量子点的形成

Ju-Seong Kim, Jonghyun Choi, Won Kook Choi
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引用次数: 0

摘要

在这项工作中,我们报告了第一次尝试研究氧化锌形成ZnS纳米结构时,硫乙酰胺(TAA)对ZnO纳米颗粒(NPs)尺寸的依赖。采用溶胶-凝胶法和水热法制备了尺寸可控的B(蓝色)_、G(绿色)_和Y(黄色)_ zno量子点(QDs)和NC(纳米晶)_ zno量子点(NPs),并与乙醇TAA溶液作为硫源反应。通过与TAA反应5~10 min, ZnO QDs/NPs开始分解为ZnS QDs,因此ZnO QDs和ZnS QDs并没有形成ZnO/ZnS的复合物,而是被分离并保持混合状态。最后,与TAA反应1 h后,ZnO QDs/NPs被完全分解为ZnS QDs,而ZnO QDs的大小可达~50 nm。所有结果表明,ZnS的形成是由于直接晶体生长和/或ZnO到ZnS的化学转化。
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Size-Controlled ZnO Nanoparticles Synthesized with Thioacetamide and Formation of ZnS Quantum Dots
In this work, we report the first attempt to investigate the dependence of thioacetamide (TAA) on the size of ZnO nanoparticles (NPs) in forming ZnS nanostructures from ZnO. Size-controlled B(blue)_, G(green)_, and Y(yellow)_ZnO quantum dots (QDs) and NC (nanocrystalline)_ZnO NPs were synthesized using a sol–gel process and a hydrothermal method, respectively, and then reacted with an ethanolic TAA solution as a sulfur source. ZnO QDs/NPs began to decompose into ZnS QDs through a reaction with TAA for 5~10 min, so rather than forming a composite of ZnO/ZnS, ZnO QDs and ZnS QDs were separated and remained in a mixed state. At last, ZnO QDs/NPs were completely decomposed into ZnS QDs after a reaction with TAA for 1 h irrespective of the size of ZnO QDs up to ~50 nm. All results indicate that ZnS formation is due to direct crystal growth and/or the chemical conversion of ZnO to ZnS.
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