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以硫酸锰为硫源、六次甲基四胺为还原剂,通过气-固相还原反应制备了α-MnS纳米晶。采用X射线衍射、透射电子显微镜、电子衍射、高分辨电子显微镜、电子能谱和紫外-可见分光光度法等对样品的结构、形貌、成分和光学性质进行了表征。结果表明:所制备的样品为纯立方晶型的单晶α-MnS纳米颗粒,粒径小,分布窄,分散性较好;紫外-可见吸收峰值与α-MnS块体材料对应峰值326 nm相比发生明显“蓝移”现象,可归因于纳米微粒的量子尺寸效应,说明所制备的α-MnS纳米晶具有一定的光学活性,在光电领域具有潜在的应用。
Α-MnS nanocrystals were prepared by gas-solid phase reduction using manganese sulfate as sulfur source and hexamethylenetetramine as reducing agent. The structure, morphology, composition and optical properties of the samples were characterized by X-ray diffraction, transmission electron microscopy, electron diffraction, high resolution electron microscopy, electron spectroscopy and UV-Vis spectrophotometry. The results show that the prepared samples are pure cubic α-MnS single crystal particles with small particle size, narrow distribution and good dispersibility. The UV-visible absorption peaks correspond to the peaks of 326 nm phase The phenomenon of “blue-shift” is obvious, which can be attributed to the quantum size effect of the nanoparticles. This indicates that the prepared α-MnS nanocrystals have certain optical activity and potential applications in optoelectronics.