SBA-15模板法合成硫化锌纳米束及其光电性能

以乙基黄酸锌(ZnR2)作为单分子前驱体, SBA-15作为模板, 合成高度有序的ZnS纳米束, 并通过透射电子显微镜(TEM)、热重-差热分析(TG-DTA)、X射线衍射(XRD)、N2吸附-脱附、紫外-可见(UV-Vis)光谱、荧光光谱和扫描电子显微镜(SEM)等一系列手段对其形貌、结构及性能进行表征. 结果表明, 此阵列具有高度有序的六方介孔结构, 同时具有类似于母模板的纤维状形貌. 采用一种简单的交流电场辅助的方法把纳米束组装到电极上, 然后通过半导体表征仪器进行测试, 表征结果发现单束ZnS纳米束呈现出非线性的整流行为, 在紫外光照射下, 其电流-电压(I-V)曲线发生了很大的变化, 说明利用它们组装的纳米器件具有良好的光开关效应，并对整流及光响应机理进行了解释.

Preparation of ZnS Nanobundles by SBA-15 Template and Their Photoelectric Properties

Highly ordered ZnS nanobundles were prepared using SBA-15 as a template and zinc ethyl xanthate as a single precursor. The nanobundles were characterized by transmission electron microscopy (TEM), thermal gravimetriedifferential thermal analysis (TG-DTA), X-ray diffraction (XRD), N2 adsorption-desorption, ultraviolet-visible (UV-Vis)spectroscopy, fluorescence spectroscopy, and scanning electron microscopy (SEM). Results showed that ZnS nanobundles possessed a highly ordered hexagonal mesostructure and fiber-like morphology, analogous to the mother template. One of the ZnS nanobundles was aligned by an alternative current (AC) electric field assembly and the rectification performance for one of the ZnS nanobundles was characterized by a semiconductor characteristic measurement system. Results demonstrated that under UV illumination, the current-voltage (Ⅰ-Ⅴ) characteristics of ZnS nanobundles could be changed significantly and a ZnS nanobundle photoelectric switching effect was observed. The mechanism of the rectifying behavior and the photoelectric switching effect of the ZnS nanobundles are discussed.