Please use this identifier to cite or link to this item: https://doi.org/10.1002/anie.201906222
Title: On-Chip Tailorability of Capacitive Gas Sensors Integrated with Metal-Organic Framework Films
Authors: YUAN HONGYE 
Tao, Jifang
Li, Nanxi
AVISHEK KARMAKAR 
TANG CHUNHUA 
Cai, Hong
Pennycook,Stephen John 
Singh, Navab
Zhao Dan 
Keywords: Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Chemistry
capacitive sensors
coordinatively unsaturated metal sites
in situ film growth
metal-organic frameworks
on-chip tailorability
CARBON-DIOXIDE
MOF
SEPARATION
MEMBRANE
ARRAYS
Issue Date: 30-Jul-2019
Publisher: WILEY-V C H VERLAG GMBH
Citation: YUAN HONGYE, Tao, Jifang, Li, Nanxi, AVISHEK KARMAKAR, TANG CHUNHUA, Cai, Hong, Pennycook,Stephen John, Singh, Navab, Zhao Dan (2019-07-30). On-Chip Tailorability of Capacitive Gas Sensors Integrated with Metal-Organic Framework Films. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 58 (40) : 14089-14094. ScholarBank@NUS Repository. https://doi.org/10.1002/anie.201906222
Abstract: © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim 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 (CO2) at room temperature. Postsynthetic modification of Mg-MOF-74 films with ethylenediamine decreases sensitivity toward benzene but increases selectivity to CO2. 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 CO2 (by ca. 25 %) stems from a tailored amine–CO2 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.
Source Title: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
URI: https://scholarbank.nus.edu.sg/handle/10635/169567
ISSN: 1433-7851
1521-3773
DOI: 10.1002/anie.201906222
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