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文章从TEOS出发,先水解制备了纳米二氧化硅微粒,再以五水四氯化锡为锡源,碳酸铵为沉淀剂,通过控制反应条件,用共沉淀法在二氧化硅表面包覆上一层锡化物层,经600℃煅烧2 h后形成了具有核壳结构的SiO2/SnO2纳米复合微粒,并用透射电镜、激光粒度仪、FTIR等手段对其形貌、结构、组成进行了表征。结果表明:形成的核壳结构SiO2/SnO2纳米复合微粒是以二氧化硅为核,氧化锡为壳,内核直径约为120 nm,壳层厚度为8～18 nm;氧化锡基本以成膜包覆为主,伴有部分氧化锡自身成核团聚。
Article from the TEOS, the first hydrolysis of nano-silica particles prepared, and then five tin tetrachloride as a tin source, ammonium carbonate as a precipitating agent, by controlling the reaction conditions, coprecipitation method in the silica surface coating A layer of tin layer was formed. After being calcined at 600 ℃ for 2 h, SiO2 / SnO2 nanocomposite particles with core-shell structure were formed. The morphology, structure and composition were characterized by transmission electron microscopy, laser particle size analyzer and FTIR. The results show that the core-shell SiO2 / SnO2 nanocomposite particles have a core of silica and a tin oxide shell of about 120 nm with a shell thickness of 8-18 nm. Cover-based, accompanied by some self-nucleation of tin oxide reunion.