LaFeO3 porous hollow micro-spindles for NO2 sensing
| Autor: | Xin Guo, Ze-Xing Cai, Wen-Lu Zhang, Xiao-Dong Zhang, Yusuke Yamauchi, Yuan-Kai Li |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
chemistry.chemical_classification Materials science Process Chemistry and Technology Shell (structure) 02 engineering and technology Polymer 021001 nanoscience & nanotechnology 01 natural sciences Dissociation (chemistry) Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis Adsorption chemistry Chemical engineering Operating temperature 0103 physical sciences Materials Chemistry Ceramics and Composites 0210 nano-technology Mesoporous material Porosity |
| Zdroj: | Ceramics International. 45:5240-5248 |
| ISSN: | 0272-8842 |
| Popis: | LaFeO 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 NO -sensing performance over other-reported LaFeO 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 NO adsorption on LaFeO , facilitated by the special hierarchical structure of the micro-spindle. |
| Databáze: | OpenAIRE |
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