Choi Junghoon, Kim Taewoo, Li He, Jung Hee-Tae, Zhao Dan
Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117585, Singapore.
Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 291, Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.
ACS Appl Mater Interfaces. 2023 Sep 20;15(37):44119-44126. doi: 10.1021/acsami.3c10304. Epub 2023 Sep 10.
Covalent organic frameworks (COFs) are attracting increasing interest in various applications due to their ability to capture molecules originating from their highly crystallized porous structures. However, most types of COFs are non-conductive and cannot be directly applied to electronic devices. Herein, we utilize non-conductive COFs in chemiresistor sensors by forming composite structures with conductive reduced graphene oxide (rGO). The composites rGO@COF exhibit low-enough resistance to be measured as chemiresistors, demonstrating enhanced gas sensing performance than pristine rGO. In particular, rGO@COF sensors achieve 2.7 times higher sensitivity toward NO and a dramatically reduced response time from 234 to 32 s compared to rGO, which can be attributed to increased surface area and NO adsorption energy. Our strategy provides new perspectives for utilizing non-conductive COFs in various electronic applications.
共价有机框架（COFs）因其能够捕获源自其高度结晶多孔结构的分子而在各种应用中引起了越来越多的关注。然而，大多数类型的COFs是非导电的，不能直接应用于电子设备。在此，我们通过与导电还原氧化石墨烯（rGO）形成复合结构，将非导电的COFs用于化学电阻传感器。rGO@COF复合材料表现出足够低的电阻，可作为化学电阻进行测量，显示出比原始rGO更强的气敏性能。特别是，rGO@COF传感器对NO的灵敏度比rGO高2.7倍，响应时间从234秒大幅缩短至32秒，这可归因于表面积和NO吸附能的增加。我们的策略为在各种电子应用中利用非导电COFs提供了新的视角。
