Microporous Elastomer Filter Coated with Metal Organic Frameworks for Improved Selectivity and Stability of Metal Oxide Gas Sensors

Microporous Elastomer Filter Coated with Metal Organic Frameworks for Improved Selectivity and Stability of Metal Oxide Gas Sensors

Despite various advantages and usefulness of semiconductor metal oxide gas sensors, low selectivity and humidity interference have limited their practical applications. In order to resolve these issues, we propose a new concept of a selective gas filtering structure that increases the gas selectivit...

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Veröffentlicht in:ACS applied materials & interfaces 2020-03, Vol.12 (11), p.13338-13347
Hauptverfasser: Hwang, Kyoungjin, Ahn, Junseong, Cho, Incheol, Kang, Kyungnam, Kim, Kyuyoung, Choi, Jungrak, Polychronopoulou, Kyriaki, Park, Inkyu
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container_end_page 13347
container_issue 11
container_start_page 13338
container_title ACS applied materials & interfaces
container_volume 12
creator Hwang, Kyoungjin
Ahn, Junseong
Cho, Incheol
Kang, Kyungnam
Kim, Kyuyoung
Choi, Jungrak
Polychronopoulou, Kyriaki
Park, Inkyu
description Despite various advantages and usefulness of semiconductor metal oxide gas sensors, low selectivity and humidity interference have limited their practical applications. In order to resolve these issues, we propose a new concept of a selective gas filtering structure that increases the gas selectivity and decreases the moisture interference of metal oxide gas sensors by coating metal organic frameworks (MOFs) on a microporous elastomer scaffold. Cu­(BTC) with an excellent selective adsorption capacity for carbon monoxide (CO) compared to hydrogen (H2) and MIL-160 with an excellent moisture adsorption capacity were uniformly coated on the microporous polydimethylsiloxane (PDMS) structure through a squeeze coating method, resulting in a high content of MOFs with a large effective surface area. A Cu­(BTC)-coated microporous PDMS filter showed an excellent adsorption efficiency (62.4%) for CO, thereby dramatically improving the selectivity of H2/CO by up to 2.6 times. In addition, an MIL-160 coated microporous PDMS filter showed a high moisture adsorption efficiency (76.2%).
doi_str_mv 10.1021/acsami.0c00143
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title Microporous Elastomer Filter Coated with Metal Organic Frameworks for Improved Selectivity and Stability of Metal Oxide Gas Sensors
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