六亚甲基四胺辅助微波水热法合成γ-MnS微晶球及其光学性能

Hexamethylene Tetramine-Assisted Microwave Hydrothermal Synthesis and Optical Properties of Spherical γ-MnS Crystallites

采用微波水热法,分别以氯化锰和硫代乙酰胺为锰源和硫源,以六亚甲基四胺(HMTA)为添加剂合成了γ-MnS微晶球。利用X射线衍射仪,场发射扫描电子显微镜,研究了HMTA加入量对样品的物相结构和微观形貌的影响。结果表明:当加入5mmol HMTA,产物由六方柱变为六方片状,并自组装成球状微晶,随着HMTA加入量的增大,自组装的球体表面逐渐光滑,粒径逐渐减小到2μm,且粒径较为均一。紫外–可见吸收光谱研究表明,六方片自组装的γ-MnS微晶球在300～400 nm处出现了较强的紫外吸收峰,随着HMTA加入量的增加,该吸收峰强度变强,且出现了明显的红移,在光电领域具有潜在的应用前景。

Spherical γ-MnS crystallites were synthesized with manganese chloride and thioacetamide as source materials and hexa- methylene tetramine （HMTA） as an additive by a microwave hydrothermal process. The influence of the HMTA amount on the phase structure and morphology of the crystallites was investigated by X-ray diffraction and field emission scanning electron microscopy, respectively. The results show that the morphology of the products changes from hexagonal columns to hexagonal flakes and self-assembled into spherical crystallites when adding the HMTA of 5 mmol. The surface of the self-assembled spheres becomes smoother, and the corresponding particle size decreases and the particle size distribution becomes narrower when the amount of HMTA increases. The UV-Visible spectrum analysis indicates that the hexagonal flakes self-assembled spherical γ-MnS crystallites have an intensive absorption peak in the ultraviolet spectrum between 300-400 nm. Also, the absorption peak becomes more and more intensive when the amount of the HMTA increases, exhibiting a red shift that may have a potential application prospect in photoelectric areas.