Hwang Kyoungjin, Ahn Junseong, Cho Incheol, Kang Kyungnam, Kim Kyuyoung, Choi Jungrak, Polychronopoulou Kyriaki, Park Inkyu
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.
Department of Nano Manufacturing Technology, Khalifa University, Abu Dhabi 127788, United Arab Emirates.
ACS Appl Mater Interfaces. 2020 Mar 18;12(11):13338-13347. doi: 10.1021/acsami.0c00143. Epub 2020 Mar 3.
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 (H) 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 H/CO by up to 2.6 times. In addition, an MIL-160 coated microporous PDMS filter showed a high moisture adsorption efficiency (76.2%).
尽管半导体金属氧化物气体传感器具有各种优点和实用性，但低选择性和湿度干扰限制了它们的实际应用。为了解决这些问题，我们提出了一种选择性气体过滤结构的新概念，通过在微孔弹性体支架上涂覆金属有机框架（MOF）来提高金属氧化物气体传感器的气体选择性并降低湿度干扰。与氢气（H）相比，对一氧化碳（CO）具有优异选择性吸附能力的Cu（BTC）和具有优异水分吸附能力的MIL-160通过挤压涂覆法均匀地涂覆在微孔聚二甲基硅氧烷（PDMS）结构上，从而得到具有大有效表面积的高含量MOF。涂有Cu（BTC）的微孔PDMS过滤器对CO表现出优异的吸附效率（62.4%），从而将H/CO的选择性显著提高了2.6倍。此外，涂有MIL-160的微孔PDMS过滤器表现出高水分吸附效率（76.2%）。
