Synthesis of CdSe Quantum Dots by Evaporation of Bulk CdSe using SMAD and Digestive Ripening Processes
Synthesis of CdSe Quantum Dots by Evaporation of Bulk CdSe using SMAD and Digestive Ripening Processes
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DOI：
10.1021/cm802831m
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发表时间：
2009-03
影响因子：
8.6
通讯作者：
S. Cingarapu;Zhiqiang Yang;C. Sorensen;K. Klabunde
中科院分区：
文献类型：
--
作者：
S. Cingarapu;Zhiqiang Yang;C. Sorensen;K. Klabunde
本文报道了用溶剂化金属原子分散法（SMAD）蒸发大块CdSe，然后在甲苯和t-丁基甲苯（TBT）中回流的方法合成CdSe量子点（QDs）。制备的SMAD产品具有较宽的光致发光光谱（PL），但在甲苯或t-丁基甲苯中回流后，有趣的是，随着荧光强度的增加，PL光谱变得狭窄。用紫外-可见原位光谱法监测了量子点的时间演化。XRD数据表明，形成的CdSe量子点保留了初始大块CdSe材料的纤锌矿结构。该合成方法的优点是使用大块CdSe作为起始材料，可以扩大规模，消除高温注入和尺寸选择性沉淀过程。
Here we report synthesis of CdSe quantum dots (QDs) by evaporation of bulk CdSe using the solvated metal atom dispersion method (SMAD), followed by reflux in toluene and in t-butyltoluene (TBT). The as-prepared SMAD product exhibits broad photoluminescence spectra (PL), but upon reflux in toluene or t-butyltoluene, interestingly, the PL spectra become narrow with an increase in fluorescence intensity. The temporal evolution of quantum dots was monitored by in situ UV−vis spectroscopy. The XRD data reveal that the formed CdSe QDs retain the wurtzite structure of the starting bulk CdSe material. The merits of this synthesis procedure are the use of bulk CdSe as starting material, possibility of scale up, elimination of high-temperature injection and size-selective precipitation processes.