LaFeO3 porous hollow micro-spindles for NO2 sensing
LaFeO3 porous hollow micro-spindles for NO2 sensing
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DOI：
10.1016/j.ceramint.2018.11.221
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发表时间：
2019-04
影响因子：
5.2
通讯作者：
Xiaodong Zhang;Wen-Lu Zhang;Z. Cai;Yuan-Kai Li;Y. Yamauchi;Xin Guo
中科院分区：
文献类型：
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作者：
Xiaodong Zhang;Wen-Lu Zhang;Z. Cai;Yuan-Kai Li;Y. Yamauchi;Xin Guo
以氰基桥联配位聚合物为牺牲模板合成了具有有趣结构特征的LaFeO 3微纺锤体。在小于5 μm的纵向尺寸内，每个微纺锤体具有包含在具有六边形横截面的中孔壳中的中空中心。与其他报道的LaFeO 3器件相比，由这些微主轴开发的电导式气体传感器表现出全面改善的NO2传感性能，包括更低的工作温度（155 °C），更高的灵敏度（在5 ppm下的响应为81.4%）和加速的响应和恢复（40 s/329 s）。这样的性能是由一个半导体机制，由形成和催化分解的亚硝酸盐物种在LaFeO 3上的NO2吸附，促进由特殊的层次结构的微纺锤体。
LaFeO3micro-spindles with intriguing structural characteristics were synthesized using cyano-bridged coordination polymers as sacrificial templates. Within a longitudinal dimension of less than 5 µm, each micro-spindle features a hollow center contained in a mesoporous shell with hexagonal cross section. Conductometric gas sensors developed from these micro-spindles demonstrate a comprehensively improved NO2-sensing performance over other-reported LaFeO3devices, including lower operating temperature (155 °C), higher sensitivity (response of 81.4% under 5 ppm) and expedited response and recovery (40 s/329 s). Such performance is enabled by a semiconducting mechanism governed by the formation and catalytic dissociation of nitrite species during NO2adsorption on LaFeO3, facilitated by the special hierarchical structure of the micro-spindle.