【摘要】 纳米氧化锡(SnO2)粉体是制备气、湿敏传感器和催化剂等较为理想的原料。利用有机单体自由基聚合反应机制,采用聚合物网络法制备了纳米氧化锡粉体。以五水氯化锡为原料,选取丙烯酰胺和N,N′-亚甲基双丙烯酰胺两种水溶性有机物作为单体,在引发剂过硫酸铵的作用下,有机单体发生交联共聚,从而使Sn4+溶液转变成凝胶。该凝胶具有三维网络状结构,能够较好地抑制热处理过程中粒子的团聚,500℃下热处理2 h获得的SnO2粉体具有金红石结构,平均粒径约为7.9 nm。更多还原

【Abstract】 Nanocrystalline tin oxide（SnO₂） is desirable for use in gas or humidity sensors and catalytic agent.SnO₂ nanopowders were prepared by polymer network method based on principle of free-radical polymerization of organic monomers with stannic chloride as starting material.Monofunctional acrylamide and difunctional N′-methylenebisacrylamide were used as organic monomers.Under the acting of initiator ammonium persulfate,aqueous solution of Sn⁴⁺ becomes a cross-linked gel as a result of the copolymerization of monomers.The three-dimensional tangled network structure of the gel helps to inhibit the aggregation of particles during heat-treating process.The resulting SnO₂ powder calcined at 500 ℃ for 2 h has rutile crystalline structure with a typical particle size of about 7.9 nm.更多还原