SnO2纳米棒的生长过程、发光性能及光催化活性

在柠檬酸的调控下,采用水热法合成SnO_2纳米棒。利用高分辨透射电子显微镜、X射线衍射、傅里叶变换红外光谱、Brunauer-Emmett-Teller氮吸附、紫外可见漫反射光谱和光致发光光谱研究了SnO_2样品在生长过程中的结构特征。结果表明,SnO_2纳米晶体的生长可进一步分为2个阶段:早期SnO_2纳米晶遵循定向附着模式生长,而后期采取Ostwald熟化模式沿001]方向缓慢生长。SnO_2纳米粒子在不同阶段的光致发光性能和光催化活性显示:在晶体的生长过程中,这2种性能变化趋势几乎相似,即生长前期性能迅速增加,随后性能逐渐降低。

Growth Process, Photoluminescence Property and Photocatalytic Activity of SnO2 Nanorods

In this work, under the regulation of citric acid, SnO₂ nanorods were synthesized by hydrothermal method. The structural characteristics of SnO 2 samples during the growth process was investigated by using high-resolution transmission electron microscope, X-ray diffraction, infrared spectra Fourier transform spectra, Brunauer-EmmettTeller nitrogen physisorption, UV-visible diffuse reflection spectrum, and photoluminescence spectra. The results reveal that the overall crystal growth can further be divided into two stages:the oriented attachment of SnO₂ nanocrystals at the early stage and subsequently a slow crystal growth along the001] direction following the Ostwald ripening mode. Photoluminescence property and photocatalytic activity of SnO₂ nanoparticles at the different stages was also investigated, which show a similar changing trend with the crystal growing:greatly increased at the former stage and gradually decreased at the latter stage.