Microwave-assisted aqueous synthesis: A rapid approach to prepare highly luminescent ZnSe(S) alloyed quantum dots
Microwave-assisted aqueous synthesis: A rapid approach to prepare highly luminescent ZnSe(S) alloyed quantum dots
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DOI：
10.1021/jp0539324
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发表时间：
2006-05-11
影响因子：
3.3
通讯作者：
Ren, JC
中科院分区：
文献类型：
--
作者：
Qian, HF;Qiu, X;Ren, JC
本文提出了一种在水相中利用微波辐射快速合成发光ZnSe纳米晶的新方法。系统研究了微波辐射条件和实验条件对纳米晶合成的影响。结果表明，反应溶液的pH值、前驱体的摩尔比和微波加热时间对ZnSe纳米晶的光学性质有显著影响。在最佳反应条件下，在1 h内制备了一系列不同尺寸的纳米晶，光致发光量子产率达到17%。HRTEM和XRD结果表明，所制备的纳米晶具有较高的结晶度。EDS谱和元素分析结果表明，随着纳米晶的生长，纳米晶的硫含量逐渐增加。我们推测纳米晶的结构是ZnSe（S）合金壳层包裹在ZnSe颗粒核的表面。此外，我们发现，在微波辐射下，反应容器中的空气中的氧气在硫醇基团的分解中起着重要的作用。
In this paper, we present a new procedure for the rapid synthesis of luminescent ZnSe nanocrystals in aqueous phase by microwave irradiation with controllable temperature. The effects of microwave irradiation and experimental conditions on the synthesis of nanocrystals were investigated systematically. It was found that there were significant effects of pH value of reaction solutions, molar ratio of precursors, and heating time of microwave irradiation on the optical properties of the ZnSe nanocrystals. A series of nanocrystals with different size was prepared in 1 h, and the photoluminescence quantum yield reached up to 17% at the optimal reaction condition. The results of HRTEM and XRD showed that the as-prepared nanocrystals had high crystallinity. The characterizations of EDS spectra and elemental analysis showed that the sulfur content of nanocrystals increased with the growth of nanocrystals. We speculated that the structure of nanocrystals was an alloy ZnSe(S) shell on the surface of the ZnSe particles core. Furthermore, we found that the oxygen from air in the reaction vessel played an important role in the decomposition of the thiol group under microwave irradiation.