Fang Zheng, Gu Zhenyu, Zhu Weihong, Zhong Xinhua
Laboratory for Advanced Materials, Department of Chemistry, East China University of Science and Technology, Shanghai 200237, People's Republic of China.
J Nanosci Nanotechnol. 2009 Oct;9(10):5880-6. doi: 10.1166/jnn.2009.1250.
High-quality (narrow size distribution, high crystallinity, high luminescent efficiency) type-II core/shell nanocrystals have been designed and prepared based on ZnSe epitaxial growth around CdS core template. The CdS/ZnSe type-II core/shell nanocrystals were prepared by the alternate injection of Se/Zn precursors into a diluted pre-prepared CdS core nanocrystals reaction solution via the successive ion layer adsorption and reaction (SILAR) technique. The claimed core/shell structure was confirmed by the optical spectra, TEM analysis and XRD measurement. The emission colors of the obtained CdS/ZnSe nanostructures can be tuned from 510 nm to 590 nm by the variation of both the size of the CdS core and the thickness of the ZnSe shell. The photoluminescence properties of the obtained CdS/ZnSe core/shell nanocrystals (emission efficiency up to 50%) are comparable to the best result reported for the extensively studied CdSe based nanocrystals.
基于硫化镉（CdS）核模板周围的硒化锌（ZnSe）外延生长，设计并制备了高质量（窄尺寸分布、高结晶度、高发光效率）的II型核壳纳米晶体。通过连续离子层吸附和反应（SILAR）技术，将硒（Se）/锌（Zn）前驱体交替注入稀释的预先制备的硫化镉核纳米晶体反应溶液中，制备了CdS/ZnSe II型核壳纳米晶体。通过光谱、透射电子显微镜（TEM）分析和X射线衍射（XRD）测量证实了所声称的核壳结构。通过改变CdS核的尺寸和ZnSe壳的厚度，所得CdS/ZnSe纳米结构的发射颜色可在510纳米至590纳米之间调节。所得CdS/ZnSe核壳纳米晶体的光致发光特性（发射效率高达50%）与广泛研究的基于硒化镉（CdSe）的纳米晶体报道的最佳结果相当。
