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以十六烷基三甲基溴化铵、十二胺为模板剂,采用双模板法及均相沉淀法,分别制备了介孔结构的SnO2.BET测试结果表明,双模板法制备的介孔SnO2平均孔径、孔容和比表面积分别为4.9nm、0.213m3·g-1和172.9m2·g-1,而均相沉淀法合成产物孔径分布的离散程度较大,孔容和比表面积降至双模板法的66.0%和21.8%.以叉指电极为工作电极集电体,利用交流阻抗技术测定了所得SnO2的湿敏性能.结果表明,与均相沉淀法制备的SnO2相比,双模板法制得SnO2的双电层电荷传递阻抗、双电层电容及Warburg扩散系数随湿度变化的幅度更明显,表明其具有较好的湿敏性能.对介孔结构特征与湿敏性能相关性研究表明,具有较大孔容和比表面的介孔SnO2可改善材料的感湿性能.
Mesoporous SnO2 was prepared by cetyltrimethylammonium bromide and dodecylamine as templates using double template method and homogeneous precipitation method, respectively. The results of BET showed that mesopores The mean pore size, pore volume and specific surface area of SnO2 were 4.9nm, 0.213m3 · g-1 and 172.9m2 · g-1, respectively. The pore size distribution and pore volume and specific surface area of SnO2 were more dispersed 66.0% and 21.8% of the double-template method, respectively.The interdigitated electrode was used as the working electrode current collector, and the wet-sensitive properties of the obtained SnO2 were measured by AC impedance technique.The results showed that compared with the SnO2 prepared by the homogeneous precipitation method, The SnO2 double layer electric charge transfer resistance, the electric double layer capacitance and the Warburg diffusion coefficient change more obviously with the humidity, which shows that the SnO2 has better moisture sensitivity.Relationship between the characteristics of mesoporous structure and moisture sensitivity has been shown , Mesoporous SnO2 with larger pore volume and specific surface can improve the moisture sensibility of the material.