Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, 230026, China.
Nanoscale. 2011 Mar;3(3):1014-21. doi: 10.1039/c0nr00741b. Epub 2010 Dec 9.
A simple hard template method has been developed to prepare uniform matchstick-like PbS nanocrystals. The approach combines functionalization of the mesoporous walls and channel surface with thioether groups, adsorption of Pb2+, and heating in an N2 atmosphere at high temperature. The structure, morphology and composition of the nanocrystals have been characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), energy dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). The optical properties of the matchstick-like PbS nanocrystals have been systematically investigated by Raman spectroscopy, UV-visible absorption spectroscopy (UV-vis), and photoluminescence spectroscopy (PL). These results demonstrate that these matchstick-like PbS nanocrystals are single crystals and possess novel optical properties, suggesting that they may have many potential applications. A large blue shift is observed in the photoluminescence spectrum, and this clearly shows the quantum size effects of the matchstick-like PbS . Furthermore, a growth mechanism of the PbS heteronanostructure is proposed.
一种简单的硬模板法被开发用来制备均匀的火柴状 PbS 纳米晶。该方法结合了介孔壁和通道表面的硫醚基团功能化、Pb2+ 的吸附以及在高温下的氮气气氛中加热。通过 X 射线粉末衍射 (XRD)、透射电子显微镜 (TEM)、高分辨率 TEM (HRTEM)、能谱 (EDS) 和 X 射线光电子能谱 (XPS) 对纳米晶的结构、形貌和组成进行了表征。通过拉曼光谱、紫外-可见吸收光谱 (UV-vis) 和光致发光光谱 (PL) 系统地研究了火柴状 PbS 纳米晶的光学性质。这些结果表明，这些火柴状 PbS 纳米晶是单晶，具有新颖的光学性质，表明它们可能有许多潜在的应用。在光致发光光谱中观察到较大的蓝移，这清楚地表明了火柴状 PbS 的量子尺寸效应。此外，还提出了 PbS 异质纳米结构的生长机制。
