丙烯酰胺辅助溶剂热技术调控硫化镍的物相及形貌

摘要

A series of single-phase nickel sulfides,such as cubic NiS2,hexagonal a-NiS and rhombohedral β-NiS,were synthesized in ethylene glycol through an acrylamide-assisted solvothermal process by using thiourea and nickel nitrate as the starting materials.The product was characterized by XRD and TEM.The results show that the surfactant acrylamide plays an important role in controlling the phase composition and morphology of nickel sulfides.The formation of β-NiS hollow nanospheres with cross-linked structure could be explained by the heterogeneous crystallization and rolling-up mechanism.%以硝酸镍和硫脲为原料、乙二醇为溶剂、丙烯酰胺作为表面活性剂,采用溶剂热技术制备了立方相NiS2,六方相a-NiS,和菱形β-NiS空心球,并用XRD及TEM对产物进行了表征.结果显示:丙烯酰胺能够有效调控硫化镍的物相组成和形貌结构.最后利用异相晶化及卷曲机理(roiling-up mechanism)解释了β-NiS空心微球的形成过程.