调制(音乐)
材料科学
分子
环境科学
光电子学
纳米技术
化学
物理
声学
有机化学
作者
Meng Li,Chanunthorn Chananonnawathorn,Ning Pan,Saksorn Limwichean,Zanhong Deng,Mati Horprathum,Junqing Chang,Shimao Wang,Hideki Nakajima,Annop Klamchuen,Liang Li,Gang Meng
出处
期刊:ACS Sensors
[American Chemical Society]
日期:2023-12-19
卷期号:9 (1): 206-216
标识
DOI:10.1021/acssensors.3c01839
摘要
Though considerable progress has been achieved on gas molecule recognition by electronic nose (e-nose) comprised of nonselective (metal oxide) semiconductor chemiresistors, extracting adequate molecular features within short time (<1 s) remains a big obstacle, which hinders the emerging e-nose applications in lethal or explosive gas warning. Herein, by virtue of the ultrafast (∼20 μs) thermal relaxation time of self-heated WO3-based chemiresistors fabricated via oblique angle deposition, instead of external heating, self-heating temperature modulation has been proposed to generate sufficient electrical response features. Accurate discrimination of 12 gases (including 3 xylene isomers with the same function group and molecular weight) has been readily achieved within 0.5–1 s, which is one order faster than the state-of-the-art e-noses. A smart wireless e-nose, capable of instantaneously discriminating target gas in ambient air background, has been developed, paving the way for the practical applications of e-nose in the area of homeland security and public health.
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