小型化
选择性
乙二胺
胺气处理
金属有机骨架
苯
金属
材料科学
分析物
多孔性
纳米技术
化学工程
无机化学
化学
有机化学
催化作用
物理化学
吸附
复合材料
工程类
冶金
作者
Hao Yuan,Jifang Tao,Nanxi Li,Avishek Karmakar,Chunhua Tang,Hong Cai,Stephen J. Pennycook,Navab Singh,Dan Zhao
标识
DOI:10.1002/ange.201906222
摘要
Abstract Gas sensing technologies for smart cities require miniaturization, cost‐effectiveness, low power consumption, and outstanding sensitivity and selectivity. On‐chip, tailorable capacitive sensors integrated with metal–organic framework (MOF) films are presented, in which abundant coordinatively unsaturated metal sites are available for gas detection. The in situ growth of homogeneous Mg‐MOF‐74 films is realized with an appropriate metal‐to‐ligand ratio. The resultant sensors exhibit selective detection for benzene vapor and carbon dioxide (CO 2 ) at room temperature. Postsynthetic modification of Mg‐MOF‐74 films with ethylenediamine decreases sensitivity toward benzene but increases selectivity to CO 2 . The reduced porosity and blocked open metal sites caused by amine coordination account for a deterioration in the sensing performance for benzene (by ca. 60 %). The enhanced sensitivity for CO 2 (by ca. 25 %) stems from a tailored amine–CO 2 interaction. This study demonstrates the feasibility of tuning gas sensing properties by adjusting MOF–analyte interactions, thereby offering new perspectives for the development of MOF‐based sensors.
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