论文部分内容阅读
采用廉价的无机盐为前驱体,在非离子性表面活性剂PEG-20000存在下采用水热法制备出不同纳米结构的ZnWO4;利用XRD和SEM对其组成、形貌和结构进行了表征,详细考察了影响形貌的因素(比如表面活性剂的用量,反应体系的pH值):随着表面活性剂用量的增加,产物的形貌从棒状逐渐转变成胎状;随着pH值的增加,产物的组成从ZnWO4转变成ZnO。也就是说,pH值对ZnWO4的形成起到非常重要的作用,纳米ZnWO4结构的形成是由于表面活性剂浓度的增加而引起的PEO和Zn2+配位状态的改变。同时研究了ZnWO4和ZnO的光致发光性能:不同形貌的ZnWO4都在激发波长为253nm时,在506nm处仅出现一个绿色峰;当激发波长为262nm时,ZnO的峰出现在396nm和510nm处。
Using cheap inorganic salts as precursors, ZnWO4 with different nanostructures was prepared by hydrothermal method in the presence of non-ionic surfactant PEG-20000. The composition, morphology and structure of the nanostructured ZnWO4 were characterized by XRD and SEM. The factors that affect the morphology (such as the amount of surfactant and the pH value of the reaction system) were investigated. With the increase of the amount of surfactant, the morphology of the product gradually changed from the rod shape to the fetal shape. With the increase of pH value, The composition of the product is changed from ZnWO4 to ZnO. In other words, pH value plays a very important role in the formation of ZnWO4. The formation of nano-ZnWO4 structure is due to the change of the coordination state of PEO and Zn2 + due to the increase of surfactant concentration. The photoluminescence properties of ZnWO 4 and ZnO were also studied. ZnWO 4 with different morphologies showed only one green peak at 506 nm at an excitation wavelength of 253 nm and peaks at 396 nm and 510 nm at an excitation wavelength of 262 nm .