TY - JOUR
T1 - Microporous Elastomer Filter Coated with Metal Organic Frameworks for Improved Selectivity and Stability of Metal Oxide Gas Sensors
AU - Hwang, Kyoungjin
AU - Ahn, Junseong
AU - Cho, Incheol
AU - Kang, Kyungnam
AU - Kim, Kyuyoung
AU - Choi, Jungrak
AU - Polychronopoulou, Kyriaki
AU - Park, Inkyu
N1 - Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (no. 2018R1A2B2004910) and by KUSTAR-KAIST Institute (KKI).
Publisher Copyright:
Copyright © 2020 American Chemical Society.
PY - 2020/3/18
Y1 - 2020/3/18
N2 - 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%).
AB - 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%).
KW - gas filter
KW - metal organic frameworks
KW - metal oxide gas sensor
KW - microporous elastomer
KW - moisture interference
UR - http://www.scopus.com/inward/record.url?scp=85082095904&partnerID=8YFLogxK
U2 - 10.1021/acsami.0c00143
DO - 10.1021/acsami.0c00143
M3 - Article
C2 - 32073247
AN - SCOPUS:85082095904
SN - 1944-8244
VL - 12
SP - 13338
EP - 13347
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 11
ER -