为了提高ZnSnO3的氢敏性能,以共沉淀法制备ZnSnO3并对其进行了贵金属Pd2+掺杂.采用X射线衍射仪(X-ray diffraction,XRD)及透射电镜(transmission electron microscopy,TEM)对制备的气敏材料进行结构及形貌表征,并使用静态配气法测试了...为了提高ZnSnO3的氢敏性能,以共沉淀法制备ZnSnO3并对其进行了贵金属Pd2+掺杂.采用X射线衍射仪(X-ray diffraction,XRD)及透射电镜(transmission electron microscopy,TEM)对制备的气敏材料进行结构及形貌表征,并使用静态配气法测试了掺杂前后ZnSnO3的氢敏性能.结果表明:掺杂Pd2+可显著提高ZnSnO3的氢敏性能.在工作温度为240℃、浓度为300×10-6的条件下,Pd2+掺杂纳米ZnSnO3对氢气的灵敏度为12,是未掺杂时的3倍.基于第一性原理探讨气敏机理,计算结果表明:Pd2+掺杂改变了ZnSnO3能带间的电子运动状态,使ZnSnO3费米能级由0.725 eV移动到1.035 eV,在费米能级附近产生新的电子峰,使其电导性能在气敏反应过程中改变更为明显.Pd2+掺杂还使ZnSnO3表面吸附氧的能力显著增加,对提高氢敏性能起到了关键作用.展开更多
采用水热、回流还原法先分别制得Zn Sn O_3纳米片及单分散Pt纳米晶稳定溶胶,然后利用化学自组装法将贵金属Pt纳米晶镶嵌到Zn Sn O_3纳米片上。利用XRD、SEM、TEM等分别对Pt/Zn Sn O_3纳米片复合物结构、微观形貌等进行表征,结果表明:通...采用水热、回流还原法先分别制得Zn Sn O_3纳米片及单分散Pt纳米晶稳定溶胶,然后利用化学自组装法将贵金属Pt纳米晶镶嵌到Zn Sn O_3纳米片上。利用XRD、SEM、TEM等分别对Pt/Zn Sn O_3纳米片复合物结构、微观形貌等进行表征,结果表明:通过化学自组装法Pt纳米晶成功修饰到Zn Sn O_3纳米片上,且分布相对均匀。采用传统旁热式结构对不同Pt含量的Pt/Zn Sn O_3纳米片复合物进行气敏性研究,结果发现Pt含量0.4%的Pt/Zn Sn O_3纳米片复合物气敏性能最佳:工作温度300℃时,对0.1 ppm乙醇及0.3 ppm甲醛有较好的响应;乙醇、甲醛气体浓度为10 ppm时,灵敏度分别达50.9和15.3。相对纯Zn Sn O_3纳米片而言,其检测下限、灵敏度、选择性等都得到很大的改善。展开更多
Perovskite-type oxide ZnSnO_3 doped with 0.5 wt% Pd was prepared directly by a hydrothermal process,its crystal structure and ceramic microstructure were characterized by XRD and TEM,and the gas sensing properties wer...Perovskite-type oxide ZnSnO_3 doped with 0.5 wt% Pd was prepared directly by a hydrothermal process,its crystal structure and ceramic microstructure were characterized by XRD and TEM,and the gas sensing properties were tested in static state.It is found that the sensors based on ZnSnO_3 micro-particles have good sensitivity and selectivity to H_2.Its sensitivity can be changed with working temperature;the sensitivity of the sensors to H_2 could arrive 21 times when the working temperature is 332℃.展开更多
文摘以Sn粒和Zn粒为原料,在柠檬酸体系中,用溶胶凝胶法合成了纳米ZnSnO3粉体.用XRD、TEM对产物的组成、粒径大小、形貌进行了表征.结果表明:产物为平均粒径10 nm左右的圆球形颗粒.采用静态配气法测试了不同烧结温度下材料对氧化性气体的气敏性能,发现烧结温度为700℃的纳米ZnSnO3材料在最佳工作温度为360℃对体积分数为5×10-5的氯气的灵敏度高达1 973,而且对其他气体有很好的抗干扰能力.元件的响应恢复特性良好,响应时间和恢复时间分别为2 s和10 s.
文摘采用水热、回流还原法先分别制得Zn Sn O_3纳米片及单分散Pt纳米晶稳定溶胶,然后利用化学自组装法将贵金属Pt纳米晶镶嵌到Zn Sn O_3纳米片上。利用XRD、SEM、TEM等分别对Pt/Zn Sn O_3纳米片复合物结构、微观形貌等进行表征,结果表明:通过化学自组装法Pt纳米晶成功修饰到Zn Sn O_3纳米片上,且分布相对均匀。采用传统旁热式结构对不同Pt含量的Pt/Zn Sn O_3纳米片复合物进行气敏性研究,结果发现Pt含量0.4%的Pt/Zn Sn O_3纳米片复合物气敏性能最佳:工作温度300℃时,对0.1 ppm乙醇及0.3 ppm甲醛有较好的响应;乙醇、甲醛气体浓度为10 ppm时,灵敏度分别达50.9和15.3。相对纯Zn Sn O_3纳米片而言,其检测下限、灵敏度、选择性等都得到很大的改善。
文摘Perovskite-type oxide ZnSnO_3 doped with 0.5 wt% Pd was prepared directly by a hydrothermal process,its crystal structure and ceramic microstructure were characterized by XRD and TEM,and the gas sensing properties were tested in static state.It is found that the sensors based on ZnSnO_3 micro-particles have good sensitivity and selectivity to H_2.Its sensitivity can be changed with working temperature;the sensitivity of the sensors to H_2 could arrive 21 times when the working temperature is 332℃.
