The powder of xwt%SiO2-WO3 was prepared by chemical precipitation.The microstructure was characterized through XRD and TEM.The effects of SiO2 content and sensors operating temperature on the sensitivity were investig...The powder of xwt%SiO2-WO3 was prepared by chemical precipitation.The microstructure was characterized through XRD and TEM.The effects of SiO2 content and sensors operating temperature on the sensitivity were investigated.The results show that the sensitivity to H2S rises when SiO2 added.The sensor has high sensitivity and good selectivity to H2S when x=5 and the optimum working temperature is 180℃.展开更多
Nanopowder of xwt% SiO2+WO3(x=0,3,10,15,20) was prepared by means of solid state reaction and deposition method.The microstructure was characterized by XRD and TEM.It was observed that the nanosized monoclinic and...Nanopowder of xwt% SiO2+WO3(x=0,3,10,15,20) was prepared by means of solid state reaction and deposition method.The microstructure was characterized by XRD and TEM.It was observed that the nanosized monoclinic and triclinic crystal phase of WO3 formed together and the grain size decreased with the increasing adulterate quantity of SiO2.The average grain size of the solid power is about 5060nm,the deposition power is about 2030nm,and the granularity is uniform.With the increasing amount of SiO2,the proportion of the monoclinic phase decreased,and the proportion of the triclinic phase increased.展开更多
文摘The powder of xwt%SiO2-WO3 was prepared by chemical precipitation.The microstructure was characterized through XRD and TEM.The effects of SiO2 content and sensors operating temperature on the sensitivity were investigated.The results show that the sensitivity to H2S rises when SiO2 added.The sensor has high sensitivity and good selectivity to H2S when x=5 and the optimum working temperature is 180℃.
文摘Nanopowder of xwt% SiO2+WO3(x=0,3,10,15,20) was prepared by means of solid state reaction and deposition method.The microstructure was characterized by XRD and TEM.It was observed that the nanosized monoclinic and triclinic crystal phase of WO3 formed together and the grain size decreased with the increasing adulterate quantity of SiO2.The average grain size of the solid power is about 5060nm,the deposition power is about 2030nm,and the granularity is uniform.With the increasing amount of SiO2,the proportion of the monoclinic phase decreased,and the proportion of the triclinic phase increased.
