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以锡酸钠和尿素为原料,采用一步水热法和两步原位化学还原法分别制备出SnO_2空心球表面载有银亚纳米颗粒的复合粉体,通过X射线衍射(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)、透射电子显微镜(TEM)等研究了表面银颗粒的厚度及分布均匀性。结果表明,2种方法均能制备出平均粒径为1~4μm、分散性良好的空心微球;一步水热法制备的SnO_2空心球表面银颗粒细小且有团聚现象,而采用两步原位化学还原法在SnO_2空心球表面获得了一层由亚纳米银颗粒组成的厚度均匀的银壳,银颗粒的粒径为100~300nm;还原剂葡萄糖的浓度对银颗粒粒径及分布影响明显。
Using sodium stannate and urea as raw materials, the composite powder containing silver subnanoparticles on the surface of SnO 2 hollow spheres was prepared by one-step hydrothermal method and two-step in-situ chemical reduction method respectively. X-ray diffraction (XRD), scanning electron The thickness and distribution uniformity of the surface silver particles were investigated by SEM, EDS and TEM. The results show that hollow microspheres with average particle diameter of 1 ~ 4μm and good dispersibility can be prepared by both methods. The silver particles on the surface of SnO_2 hollow sphere prepared by one-step hydrothermal method are small and agglomerated, In the chemical reduction method, a uniform thickness of silver shell was obtained on the surface of SnO 2 hollow sphere. The silver particle size was 100-300 nm. The concentration of reducing agent glucose had a significant effect on the size and distribution of silver particles.