Hu Pengfei, Jia Dianzeng, Cao Yali, Huang Yudai, Liu Lang, Luo Jianmin
Nanoscale Res Lett. 2009 Feb 18;4(5):437-443. doi: 10.1007/s11671-009-9265-2.
With air-stable and generic reagents, CdSe nanocrystals with tunable morphologies were prepared by controlling the temperature in the solution reaction route. Thereinto, the lower reaction temperature facilitates the anisotropic growth of crystals to obtain high-yield CdSe ring- and tribulus-shaped nanocrystals with many branches on their surfaces. The photoluminescence properties are sensitive to the nature of particle and its surface. The products synthesized at room temperature, whose surfaces have many branches, show higher blue shift and narrower emission linewidths (FWHM) of photoluminescence than that of samples prepared at higher temperature, whose surfaces have no branches. Microstructural studies revealed that the products formed through self-assembly of primary crystallites. Nanorings formed through the nonlinear attachment of primary crystallites, and the branches on the surfaces grew by linear attachment at room temperature. And the structure of tribulus-shaped nanoparticle was realized via two steps of aggregation, i.e., random and linear oriented aggregation. Along with the elevation of temperature, the branches on nanocrystal surfaces shortened gradually because of the weakened linear attachment. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s11671-009-9265-2) contains supplementary material, which is available to authorized users.
使用对空气稳定的通用试剂，通过控制溶液反应路线中的温度制备了具有可调形态的CdSe纳米晶体。其中，较低的反应温度有利于晶体的各向异性生长，从而获得高产率的表面带有许多分支的CdSe环形和刺状纳米晶体。光致发光性质对颗粒及其表面性质敏感。室温下合成的产物，其表面有许多分支，与在较高温度下制备的表面无分支的样品相比，显示出更高的蓝移和更窄的光致发光发射线宽（半高宽）。微观结构研究表明，产物是通过初级微晶的自组装形成的。纳米环是通过初级微晶的非线性附着形成的，表面的分支在室温下通过线性附着生长。刺状纳米颗粒的结构是通过两步聚集实现的，即随机聚集和线性取向聚集。随着温度升高，由于线性附着减弱，纳米晶体表面的分支逐渐缩短。电子补充材料：本文的在线版本（doi:10.1007/s11671-009-9265-2）包含补充材料，授权用户可以获取。
