凹陷立方体PbS纳米结构的溶剂热合成及其性能研究

Solvothermal Synthesis and Property Study of Unique Depressed PbS Nanocubes

以硝酸铅和硫脲为反应前驱体,以一种新的表面活性剂四正丁基溴化铵为封端剂,采用简单的溶剂热法在160℃反应24h成功制备了大量PbS纳米结构。利用XRD、SEM、TEM、荧光光谱以及拉曼光谱表征了产物的形貌、结构和物相。结果表明,所制备的PbS呈立方体状,其6个(100)面向内凹陷形成了独特的凹陷立方体结构,边长约为1.5μm;实验证明反应时间对产物的形貌具有重要的影响。并提出了凹陷立方体的形成机理。

PbS nanostructures were successfully synthesized in high yield by a facile solvothermal process at 160℃ for 24h, employing lead nitrate（Pb（NO3 ）2 ） and thiourea（SC（NH2 ）2 ） as precursors. A new surfactant tetrabotyl ammonium bromide（TBAB）, was used in this process. The morphology, structure, and phase composition of PbS crystals were determined by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, transmission electron mi- croscopy（TEM）, Raman spectroscopy and photoluminescence emission. The results show that the mean diameter of the as-prepared PbS cube is about 1.5μm and the six （100） faces are depressed to form a unique structure. It is also demonstrated that the morphologies of PbS crystals are significantly influenced by reaction time. A growth process is proposed for the formation of depressed PbS cubes.