School of Resource and Environmental Science, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan, 430079, China,
J Fluoresc. 2014 Jan;24(1):57-65. doi: 10.1007/s10895-013-1270-2. Epub 2013 Aug 10.
Quasi core shell alloyed CdSeS quantum dots (QDs) have been prepared through a facile aqueous-phase route employing microwave irradiation technique. The optical spectroscopy and structure characterization evidenced the quasi core shell alloyed structures of CdSeS QDs. The X-ray diffraction patterns of the obtained CdSeS QDs displayed peak positions very close to those of bulk cubic CdS crystal structures and the result of X-ray photoelectron spectroscopy data re-confirmed the thick CdS shell on the CdSe core. The TEM images and HRTEM images of the CdSeS QDs ascertained the well-defined spherical particles and a relatively narrow size distribution. On the basis, the stability of the obtained QDs in an oxidative environment was also discussed using etching reaction by H2O2. The experiments result showed the as-prepared QDs present high tolerance towards H2O2, obviously superior to the commonly used CdTe QDs and core-shell CdTe/CdS QDs, which was attributed to the unique quasi core-shell CdSeS crystal structure and the small lattice mismatch between CdSe and CdS semiconductor materials. This assay provided insight to obtain high stable crystal structured semiconductor nanocrystals in the design and synthesis process.
通过微波辐射技术的简便水相法制备了准核壳合金化 CdSeS 量子点 (QD)。光学光谱和结构表征证明了 CdSeS QD 的准核壳合金结构。所得到的 CdSeS QD 的 X 射线衍射图谱显示出的峰位置非常接近体立方 CdS 晶体结构的位置，X 射线光电子能谱数据的结果也再次证实了 CdSe 核上的厚 CdS 壳。CdSeS QD 的 TEM 图像和 HRTEM 图像确定了其具有良好定义的球形颗粒和相对较窄的尺寸分布。在此基础上，还通过 H2O2 的刻蚀反应讨论了所得到的 QD 在氧化环境中的稳定性。实验结果表明，所制备的 QD 对 H2O2 具有高耐受性，明显优于常用的 CdTe QD 和核壳 CdTe/CdS QD，这归因于独特的准核壳 CdSeS 晶体结构和 CdSe 和 CdS 半导体材料之间的小晶格失配。该研究为在设计和合成过程中获得高稳定性的晶体结构半导体纳米晶体提供了思路。
