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Adv Mater

Title:		ZnO Nanosheets Abundant in Oxygen Vacancies Derived from Metal-Organic Frameworks for ppb-Level Gas Sensing
Author(s):		Yuan H; Aljneibi S; Yuan J; Wang Y; Liu H; Fang J; Tang C; Yan X; Cai H; Gu Y; Pennycook SJ; Tao J; Zhao D;
Address:		"Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585, Singapore. Institute of Microelectronics, A*STAR (Agency for Science Technology and Research), 2 Fusionopolis Way, #08-02 Innovis Tower, Singapore, 138634, Singapore. College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China. National Metrology Centre, A*STAR, 1 Science Park Drive, Singapore, 118221, Singapore. Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117575, Singapore"
Journal Title:		Adv Mater
Year:		2019
Volume:		20190113
Issue:		11
Page Number:		e1807161 -
DOI:		10.1002/adma.201807161
ISSN/ISBN:		1521-4095 (Electronic) 0935-9648 (Linking)
Abstract:		"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"
Keywords:		ZnO nanosheets defect engineering metal-organic frameworks oxygen vacancies ppb-level gas sensing;
Notes:		"PubMed-not-MEDLINEYuan, 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 eng CENGas R-261-508-001-646/National University of Singapore/ MOE AcRF Tier 1 R-279-000-472-112/Ministry of Education, Singapore/ R-279-000-540-114/Ministry of Education, Singapore/ PSF 1521200078/Agency for Science, Technology and Research/ IRG A1783c0015/Agency for Science, Technology and Research/ IAF-PP A1789a0024/Agency for Science, Technology and Research/ Germany 2019/01/15 Adv Mater. 2019 Mar; 31(11):e1807161. doi: 10.1002/adma.201807161. Epub 2019 Jan 13"