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Herein, a high\u2010performance NO\n                    <jats:sub>2<\/jats:sub>\n                    sensors based on all\u2010inorganic perovskite nanocrystals (PNCs) is reported, achieving room temperature operation with ultra\u2010fast response and recovery time. After tailoring the halide composition, superior sensitivity of \u224867 at 8\u00a0ppm NO\n                    <jats:sub>2<\/jats:sub>\n                    is obtained in CsPbI\n                    <jats:sub>2<\/jats:sub>\n                    Br PNC sensors with a detection level down to 2 ppb, which outperforms other nanomaterial\u2010based NO\n                    <jats:sub>2<\/jats:sub>\n                    sensors. Furthermore, the remarkable optoelectronic properties of such PNCs enable dual\u2010mode operation, i.e., chemiresistive and chemioptical sensing, presenting a new and versatile platform for advancing high\u2010performance, point\u2010of\u2010care NO\n                    <jats:sub>2<\/jats:sub>\n                    detection technologies.\n                  <\/jats:p>","DOI":"10.1002\/smtd.202300417","type":"journal-article","created":{"date-parts":[[2023,6,18]],"date-time":"2023-06-18T02:31:13Z","timestamp":1687055473000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":30,"title":["High\u2010Performance Optoelectronic Gas Sensing Based on All\u2010Inorganic Mixed\u2010Halide Perovskite Nanocrystals with Halide Engineering"],"prefix":"10.1002","volume":"8","author":[{"given":"Jiyun","family":"Kim","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering University of New South Wales (UNSW)  Sydney NSW 2052 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alishba T.","family":"John","sequence":"additional","affiliation":[{"name":"Nanotechnology Research Laboratory Research School of Electrical Energy and Materials Engineering Chemistry College of Engineering and Computer Science Australian National University (ANU)  Canberra ACT 0200 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hanchen","family":"Li","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering University of New South Wales (UNSW)  Sydney NSW 2052 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chien\u2010Yu","family":"Huang","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering University of New South Wales (UNSW)  Sydney NSW 2052 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuan","family":"Chi","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering University of New South Wales (UNSW)  Sydney NSW 2052 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pradeep Raja","family":"Anandan","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering University of New South Wales (UNSW)  Sydney NSW 2052 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Krishnan","family":"Murugappan","sequence":"additional","affiliation":[{"name":"Commonwealth Scientific and Industrial Research Organization (CSIRO) Mineral Resources  Clayton South Victoria 3169 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianbo","family":"Tang","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering University of New South Wales (UNSW)  Sydney NSW 2052 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0882-4728","authenticated-orcid":false,"given":"Chun\u2010Ho","family":"Lin","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering University of New South Wales (UNSW)  Sydney NSW 2052 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Long","family":"Hu","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering University of New South Wales (UNSW)  Sydney NSW 2052 Australia"},{"name":"School of Engineering Macquarie University  Sydney NSW 2019 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kourosh","family":"Kalantar\u2010Zadeh","sequence":"additional","affiliation":[{"name":"School of Chemical and Biomolecular Engineering University of Sydney  Sydney NSW 2006 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Antonio","family":"Tricoli","sequence":"additional","affiliation":[{"name":"Nanotechnology Research Laboratory Research School of Electrical Energy and Materials Engineering Chemistry College of Engineering and Computer Science Australian National University (ANU)  Canberra ACT 0200 Australia"},{"name":"Nanotechnology Research Laboratory School of Biomedical Engineering Faculty of Engineering The University of Sydney  Sydney NSW 2006 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dewei","family":"Chu","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering University of New South Wales (UNSW)  Sydney NSW 2052 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0845-4827","authenticated-orcid":false,"given":"Tom","family":"Wu","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering University of New South Wales (UNSW)  Sydney NSW 2052 Australia"},{"name":"Department of Applied Physics The Hong Kong Polytechnic University  Kowloon Hong Kong 999077 P. 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