LaFeO3 porous hollow micro-spindles for NO2 sensing

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 µm, each micro-spindle features a hollow center contained in a mesoporous shell with hexagonal cross se...

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Bibliographic Details
Published in:Ceramics international 2019-04, Vol.45 (5), p.5240-5248
Main Authors: Zhang, Xiao-Dong, Zhang, Wen-Lu, Cai, Ze-Xing, Li, Yuan-Kai, Yamauchi, Yusuke, Guo, Xin
Format: Article
Language:English
Subjects:
LaFeO3
Mesoporous
NO2 sensor
Prussian blue analogues
Self-templated synthesis
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Summary: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 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 LaFeO3 devices, 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 NO2 adsorption on LaFeO3, facilitated by the special hierarchical structure of the micro-spindle.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2018.11.221