{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,12]],"date-time":"2026-06-12T07:03:47Z","timestamp":1781247827044,"version":"3.54.1"},"reference-count":65,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2021,3,11]],"date-time":"2021-03-11T00:00:00Z","timestamp":1615420800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Nowadays, metal oxide semiconductors (MOS)-reduced graphene oxide (rGO) nanocomposites have attracted significant research attention for gas sensing applications. Herein, a novel composite material is synthesized by combining two p-type semiconductors, i.e., Cu2O and rGO, and a p-p-type gas sensor is assembled for NO2 detection. Briefly, polypyrrole-coated cuprous oxide nanowires (PPy\/Cu2O) are prepared via hydrothermal method and combined with graphene oxide (GO). Then, the nanocomposite (rGO\/PPy\/Cu2O) is obtained by using high-temperature thermal reduction under Ar atmosphere. The results reveal that the as-prepared rGO\/PPy\/Cu2O nanocomposite exhibits a maximum NO2 response of 42.5% and is capable of detecting NO2 at a low concentration of 200 ppb. Overall, the as-prepared rGO\/PPy\/Cu2O nanocomposite demonstrates excellent sensitivity, reversibility, repeatability, and selectivity for NO2 sensing applications.<\/jats:p>","DOI":"10.3390\/s21061958","type":"journal-article","created":{"date-parts":[[2021,3,11]],"date-time":"2021-03-11T05:38:22Z","timestamp":1615441102000},"page":"1958","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Synthesis of Cu2O-Modified Reduced Graphene Oxide for NO2 Sensors"],"prefix":"10.3390","volume":"21","author":[{"given":"Manman","family":"Huang","sequence":"first","affiliation":[{"name":"School of Optoelectronic Science and Engineering &amp; Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China"},{"name":"Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province &amp; Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanyan","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Optoelectronic Science and Engineering &amp; Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China"},{"name":"Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province &amp; Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuyang","family":"Ying","sequence":"additional","affiliation":[{"name":"School of Optoelectronic Science and Engineering &amp; Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China"},{"name":"Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province &amp; Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhekun","family":"Wu","sequence":"additional","affiliation":[{"name":"School of Optoelectronic Science and Engineering &amp; Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China"},{"name":"Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province &amp; Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weixiao","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Optoelectronic Science and Engineering &amp; Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China"},{"name":"Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province &amp; Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Da","family":"Chen","sequence":"additional","affiliation":[{"name":"College of Electronics, Communications, and Physics, Shandong University of Science and Technology, Qingdao 266590, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Changsi","family":"Peng","sequence":"additional","affiliation":[{"name":"School of Optoelectronic Science and Engineering &amp; Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China"},{"name":"Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province &amp; Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,3,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"8372","DOI":"10.1016\/j.ceramint.2017.03.179","article-title":"Cu2O quantum dots modified by RGO nanosheets for ultrasensitive and selective NO2 gas detection","volume":"43","author":"Zhou","year":"2017","journal-title":"Ceram. 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