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Non-contact real-time detection of trace nitro-explosives by MOF composites visible-light chemiresistor
To create an artificial structure to remarkably surpass the sensitivity, selectivity and speed of the olfaction system of animals is still a daunting challenge. Herein, we propose a core-sheath pillar (CSP) architecture with a perfect synergistic interface that effectively integrates the advantages...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Oxford University Press
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9522384/ https://www.ncbi.nlm.nih.gov/pubmed/36196111 http://dx.doi.org/10.1093/nsr/nwac143 |
Sumario: | To create an artificial structure to remarkably surpass the sensitivity, selectivity and speed of the olfaction system of animals is still a daunting challenge. Herein, we propose a core-sheath pillar (CSP) architecture with a perfect synergistic interface that effectively integrates the advantages of metal–organic frameworks and metal oxides to tackle the above-mentioned challenge. The sheath material, NH(2)-MIL-125, can concentrate target analyte, nitro-explosives, by 10(12) times from its vapour. The perfect band-matched synergistic interface enables the TiO(2) core to effectively harvest and utilize visible light. At room temperature and under visible light, CSP (TiO(2), NH(2)-MIL-125) shows an unexpected self-promoting analyte-sensing behaviour. Its experimentally reached limit of detection (∼0.8 ppq, hexogeon) is 10(3) times lower than the lowest one achieved by a sniffer dog or all sensing techniques without analyte pre-concentration. Moreover, the sensor exhibits excellent selectivity against commonly existing interferences, with a short response time of 0.14 min. |
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