期刊
CERAMICS INTERNATIONAL
卷 45, 期 5, 页码 5240-5248出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.11.221
关键词
LaFeO3; NO2 sensor; Self-templated synthesis; Prussian blue analogues; Mesoporous
资金
- Natural Science Foundation of China (NSFC) [51302098, 51627807]
LaFeO3 micro-spindles with intriguing structural characteristics were synthesized using cyano-bridged coordination polymers as sacrificial templates. Within a longitudinal dimension of less than 5 mu m, 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 LaFeO3 devices, including lower operating temperature (155 degrees 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 NO2 adsorption on LaFeO3, facilitated by the special hierarchical structure of the micro-spindle.
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