三维有序大孔SnO_2及SnO_2/SiO_2材料的制备及结构特征

Synthesis and Structure Characteristic of Three-dimensional Ordered Macroporous SnO_2 and SnO_2/SiO_2 Materials

以SnCl2-2H2O和正硅酸乙酯为原料,用微球直径为585nm的聚苯乙烯胶晶为模板,制备了三维有序大孔SnO2和SnO2/SiO2材料。SEM观察表明,直接用SnCl2的乙醇溶液为前驱物溶液,难以形成有序的大孔结构,加入正硅酸乙酯或将SnCl2溶液转变为氧化物溶胶,则得到的大孔材料孔结构三维有序排列相当好,孔径为453-500nm,孔与孔之间通过小孔相连。XRD分析表明,大孔材料孔壁由晶粒直径约为17nm SnO2粒子构成。

By using SnCl2.2H(2)O and tetraethyl orthosilicate as raw materials, polystyrene colloidal crystal with diameter of 585nm as template, three-dimensional ordered macroporous (3DOM) SnO2 and SnO2/SiO2 were successfully synthesized. SEM observation shows that 3DOM SnO2 has a pore size of 453similar to500nm, and 3DOM SnO2/SiO2 has a pore size of 500nm. And such macropores connect with each other by small windows. Compared with the polystyrene colloidal crystal used, the 3DOM materials show shrinkage to some extent in pore size. The study indicates that it is difficult to obtain ordered pore structure when SnCl2 is used as precursor directly. But addition of tetraethyl orthosilicate or conversion of SnCl2 solution to oxide sol favors the formation of the highly ordered macroporous structure. XRD measurement indicates that the walls of the 3DOM materials are made of SnO2 nanoparticles with particle sizes around 17nm.