Please use this identifier to cite or link to this item: https://doi.org/10.1002/adma.201807161
Title: ZnO Nanosheets Abundant in Oxygen Vacancies Derived from Metal-Organic Frameworks for ppb-Level Gas Sensing
Authors: Yuan, Hongye 
Aljneibi, Saif Abdulla Ali Alateeqi
Yuan, Jiaren
Wang, Yuxiang 
Liu, Hui
Fang, Jie 
Tang, Chunhua 
Yan, Xiaohong
Cai, Hong
Gu, Yuandong 
Pennycook, Stephen John 
Tao, Jifang
Zhao, Dan 
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
Defect engineering
Metal-organic frameworks
Oxygen vacancies
Ppb-level gas sensing
ZnO nanosheets
PERFORMANCE
NANOCAGES
Issue Date: 15-Mar-2019
Publisher: WILEY-VCH VERLAG
Citation: Yuan, Hongye, Aljneibi, Saif Abdulla Ali Alateeqi, Yuan, Jiaren, Wang, Yuxiang, Liu, Hui, Fang, Jie, Tang, Chunhua, Yan, Xiaohong, Cai, Hong, Gu, Yuandong, Pennycook, Stephen John, Tao, Jifang, Zhao, Dan (2019-03-15). ZnO Nanosheets Abundant in Oxygen Vacancies Derived from Metal-Organic Frameworks for ppb-Level Gas Sensing. ADVANCED MATERIALS 31 (11). ScholarBank@NUS Repository. https://doi.org/10.1002/adma.201807161
Abstract: © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Surmounting the inhomogeniety issue of gas sensors and realizing their reproducible ppb-level gas sensing are highly desirable for widespread deployments of sensors to build networks in applications of industrial safety and indoor/outdoor air quality monitoring. Herein, a strategy is proposed to substantially improve the surface homogeneity of sensing materials and gas sensing performance via chip-level pyrolysis of as-grown ZIF-L (ZIF stands for zeolitic imidazolate framework) films to porous and hierarchical zinc oxide (ZnO) nanosheets. A novel approach to generate adjustable oxygen vacancies is demonstrated, through which the electronic structure of sensing materials can be fine-tuned. Their presence is thoroughly verified by various techniques. The sensing results demonstrate that the resultant oxygen vacancy-abundant ZnO nanosheets exhibit significantly enhanced sensitivity and shortened response time toward ppb-level carbon monoxide (CO) and volatile organic compounds encompassing 1,3-butadiene, toluene, and tetrachloroethylene, which can be ascribed to several reasons including unpaired electrons, consequent bandgap narrowing, increased specific surface area, and hierarchical micro–mesoporous structures. This facile approach sheds light on the rational design of sensing materials via defect engineering, and can facilitate the mass production, commercialization, and large-scale deployments of sensors with controllable morphology and superior sensing performance targeted for ultratrace gas detection.
Source Title: ADVANCED MATERIALS
URI: https://scholarbank.nus.edu.sg/handle/10635/169577
ISSN: 09359648
15214095
DOI: 10.1002/adma.201807161
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