Systematic study of the photoluminescence dependence of thiol-capped CdTe nanocrystals on the reaction conditions
Systematic study of the photoluminescence dependence of thiol-capped CdTe nanocrystals on the reaction conditions
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DOI：
10.1021/jp044770z
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发表时间：
2005-09-22
影响因子：
3.3
通讯作者：
Wang, CC
中科院分区：
文献类型：
--
作者：
Guo, J;Yang, WL;Wang, CC
报道了一种制备高质量硫醇修饰的纳米晶(NCS)的改进方法。实验结果表明，前驱体溶液中配体(硫代乙醇酸)与单体(Cd~(2+)离子)摩尔比的不同对制备的CdTe纳米碳管的光致发光量子产率(QY)有重要影响。当[配体]/[单体]=1.2时，最大荧光发射峰出现在橙红色窗口，在室温下，未经任何后处理，PL QY增加了50%。同时，合适的反应条件有利于纳米碳管表面结构的优化，得到了由绿色到红色的较高的发光QY。此外，还讨论了水热合成与传统水相合成的一些不同之处。
A modified method to prepare high-quality thiol-capped CdTe nanocrystals (NCs) was reported in this paper. The experimental results showed that the different molar ratios of the ligands (thioglycolic acid) to monomers (Cd2+ ions) in the precursor solution played an important role in the photoluminescence (PL) quantum yield (QY) of the as-prepared CdTe NCs. When [ligand]/[monomer] = 1.2, the maximum fluorescent emission peak appeared in the orange-red window, and the PL QY increased up to 50% at room temperature without any postpreparative treatment. In the meantime, suitable reaction conditions were in favor of the optimization of the surface structure of NCs, resulting in the relatively high PL QY from green to red. In addition, some differences between hydrothermal synthesis and traditional aqueous synthesis of CdTe NCs were discussed.