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为改善二氧化锡(SnO_2)的气敏性能,以聚苯乙烯(PS)微球为模板,SnO_2纳米晶为骨架,采用颗粒模板法成功制备大孔SnO_2(MP-SnO_2)气敏材料,并对制备的样品进行差热分析(TGDTA)、X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和氮气吸附脱附分析。结果表明,制备的MP-SnO_2样品具有贯通孔道大孔结构,平均大孔孔径为300 nm,与SnO_2纳米晶相比具有更大的比表面积。通过气敏测试发现MP-SnO_2在280℃工作温度下对体积分数4×10-4的乙醇气体的灵敏度高达138,是SnO_2纳米颗粒的1.6倍,显示出更加优异的气敏性能。
In order to improve the gas sensing properties of SnO_2, polystyrene (PS) microspheres were used as templates and SnO_2 nanocrystals as the framework. The porous SnO_2 (MP-SnO_2) gas-sensitive materials were successfully prepared by particle template method. The prepared samples were analyzed by TGDTA, XRD, SEM, TEM and N2 adsorption desorption. The results show that the prepared MP-SnO 2 sample has a macroporous structure with a large average pore diameter of 300 nm and has a larger specific surface area than the SnO 2 nanocrystals. The sensitivity of MP-SnO 2 to ethanol gas with a volume fraction of 4 × 10-4 under the operating temperature of 280 ℃ was found to be 138, which is 1.6 times that of SnO 2 nanoparticles by gas-sensing test, which shows more excellent gas-sensing performance.