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Title: Non–contact real–time detection of trace nitro-explosives by MOF composites visible–light chemiresistor
Authors: Deng, Wei-Hua
Yao, Ming-Shui
Zhang, Min-Yi
Tsujimoto, Masahiko
Otake, Kenichi
Wang, Bo
Li, Chun-Sen
Xu, Gang
Kitagawa, Susumu
Author's alias: 辻本, 将彦
大竹, 研一
北川, 進
Keywords: MOFs
metal oxides
electrical devices
thin films
gas sensors
Issue Date: Oct-2022
Publisher: Oxford University Press (OUP)
Journal title: National Science Review
Volume: 9
Issue: 10
Thesis number: nwac143
Abstract: 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, NH₂-MIL-125, can concentrate target analyte, nitro-explosives, by 10¹² times from its vapour. The perfect band-matched synergistic interface enables the TiO₂ core to effectively harvest and utilize visible light. At room temperature and under visible light, CSP (TiO₂, NH₂-MIL-125) shows an unexpected self-promoting analyte-sensing behaviour. Its experimentally reached limit of detection (~0.8 ppq, hexogeon) is 10³ 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.
Rights: © The Author(s) 2022. Published by Oxford University Press on behalf of China Science Publishing & Media Ltd.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
URI: http://hdl.handle.net/2433/276720
DOI(Published Version): 10.1093/nsr/nwac143
PubMed ID: 36196111
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