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Here we report an actuator-driven, purge-free chemiresistive gas sensor that is capable of reliably detecting 0.05 ppm HCHO in the air. The sensor is composed of an HCHO→HCl converter (powdery hydroxylamine salt, HA), an HCl detector (SWCNT-based chemiresistor), and an HCl blocker (thin plastic plate). Upon exposure to HCHO, the HA emits HCl vapor, which diffuses onto the adjacent SWCNT and increases its electric conductivity through p-doping. Meanwhile, inserting a plastic plate between HA and SWCNTs makes the conductivity of SWCNTs insensitive to HCHO. Thus, under periodic actuation (insertion and removal) of the plastic plate, HCHO can be reliably detected in a wide concentration range (0.05-15 ppm), with excellent selectivity over other volatile organic compounds. The actuator-driven system is beneficial because the purge gas is unnecessary for sensor recovery and baseline correction. Moreover, since the response to HCHO is synchronized with the actuation timing of the plate, even small (~0.8%) responses to 0.05 ppm HCHO can be clearly separated from larger noise responses (>1%) caused by interfering effects and baseline drift. We believe that this work provides substantial insights into the practical implementation of nanomaterial-based chemiresistive gas sensors.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: sensor

刊行年月日: 2025-06-21

出版者: MDPI

掲載誌:

• NANOMATERIALS (ISSN: 20794991) vol. 15 issue. 13 962

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.3390/nano15130962

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更新時刻: 2025-06-24 16:30:31 +0900

MDRでの公開時刻: 2025-06-24 16:23:25 +0900