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Unexpectedly, the results show that amorphous copper oxide porous nanosheets have much better gas sensing properties than highly crystalline copper oxide to a serious of volatile organic compounds, and the lowest detection limit (LOD) of the amorphous copper oxide porous nanosheets to methanal is even up to 10\u2005ppb. By contrast, the LOD of the highly crystalline copper oxide porous nanosheets to methanal is 95\u2005ppb. Experiments prove that the oxygen vacancies contained in the amorphous copper oxide porous nanosheets play a key role in improving gas sensitivity, which greatly improve the chemical activity of the materials, especially for the adsorption of molecules containing oxygen\u2010groups such as methanal and oxygen.<\/jats:p>","DOI":"10.1002\/open.201900327","type":"journal-article","created":{"date-parts":[[2020,1,17]],"date-time":"2020-01-17T06:04:30Z","timestamp":1579241070000},"page":"80-86","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Gas\u2010Sensing Activity of Amorphous Copper Oxide Porous Nanosheets"],"prefix":"10.1002","volume":"9","author":[{"given":"Zheng","family":"Tian","sequence":"first","affiliation":[{"name":"School of the Environment and Safety engineering Jiangsu University  Zhenjiang 212013 P. R. 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