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Herein, a strategy is proposed to substantially improve the surface homogeneity of sensing materials and gas sensing performance via chip\u2010level pyrolysis of as\u2010grown ZIF\u2010L (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\u2010tuned. Their presence is thoroughly verified by various techniques. The sensing results demonstrate that the resultant oxygen vacancy\u2010abundant ZnO nanosheets exhibit significantly enhanced sensitivity and shortened response time toward ppb\u2010level carbon monoxide (CO) and volatile organic compounds encompassing 1,3\u2010butadiene, toluene, and tetrachloroethylene, which can be ascribed to several reasons including unpaired electrons, consequent bandgap narrowing, increased specific surface area, and hierarchical micro\u2013mesoporous 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\u2010scale deployments of sensors with controllable morphology and superior sensing performance targeted for ultratrace gas detection.<\/jats:p>","DOI":"10.1002\/adma.201807161","type":"journal-article","created":{"date-parts":[[2019,1,14]],"date-time":"2019-01-14T02:37:28Z","timestamp":1547433448000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":355,"title":["ZnO Nanosheets Abundant in Oxygen Vacancies Derived from Metal\u2010Organic Frameworks for ppb\u2010Level Gas Sensing"],"prefix":"10.1002","volume":"31","author":[{"given":"Hongye","family":"Yuan","sequence":"first","affiliation":[{"name":"Department of Chemical and Biomolecular Engineering National University of Singapore  4 Engineering Drive 4 Singapore 117585 Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Saif Abdulla Ali Alateeqi","family":"Aljneibi","sequence":"additional","affiliation":[{"name":"Institute of Microelectronics A*STAR (Agency for Science Technology and Research)  2 Fusionopolis Way, #08\u201002 Innovis Tower Singapore 138634 Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiaren","family":"Yuan","sequence":"additional","affiliation":[{"name":"College of Science Nanjing University of Aeronautics and Astronautics  Nanjing 210016 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuxiang","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biomolecular Engineering National University of Singapore  4 Engineering Drive 4 Singapore 117585 Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hui","family":"Liu","sequence":"additional","affiliation":[{"name":"National Metrology Centre  A*STAR, 1 Science Park Drive Singapore 118221 Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jie","family":"Fang","sequence":"additional","affiliation":[{"name":"National Metrology Centre  A*STAR, 1 Science Park Drive Singapore 118221 Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chunhua","family":"Tang","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering National University of Singapore  9 Engineering Drive 1 Singapore 117575 Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaohong","family":"Yan","sequence":"additional","affiliation":[{"name":"College of Science Nanjing University of Aeronautics and Astronautics  Nanjing 210016 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hong","family":"Cai","sequence":"additional","affiliation":[{"name":"Institute of Microelectronics A*STAR (Agency for Science Technology and Research)  2 Fusionopolis Way, #08\u201002 Innovis Tower Singapore 138634 Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuandong","family":"Gu","sequence":"additional","affiliation":[{"name":"Institute of Microelectronics A*STAR (Agency for Science Technology and Research)  2 Fusionopolis Way, #08\u201002 Innovis Tower Singapore 138634 Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephen John","family":"Pennycook","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering National University of Singapore  9 Engineering Drive 1 Singapore 117575 Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jifang","family":"Tao","sequence":"additional","affiliation":[{"name":"Institute of Microelectronics A*STAR (Agency for Science Technology and Research)  2 Fusionopolis Way, #08\u201002 Innovis Tower Singapore 138634 Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4427-2150","authenticated-orcid":false,"given":"Dan","family":"Zhao","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biomolecular Engineering National University of Singapore  4 Engineering Drive 4 Singapore 117585 Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2019,1,13]]},"reference":[{"key":"e_1_2_5_1_1","author":"Roussel B.","year":"2016","journal-title":"Gas Sensor Technology & Market Report"},{"key":"e_1_2_5_2_1","first-page":"395","volume":"13","author":"Hancke P. 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