{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T07:20:45Z","timestamp":1787728845861,"version":"build-2784847793"},"reference-count":52,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2026,2,6]],"date-time":"2026-02-06T00:00:00Z","timestamp":1770336000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100006769","name":"Russian Science Foundation","doi-asserted-by":"publisher","award":["25-72-00140"],"award-info":[{"award-number":["25-72-00140"]}],"id":[{"id":"10.13039\/501100006769","id-type":"DOI","asserted-by":"publisher"}]},{"name":"KBSU","award":["33"],"award-info":[{"award-number":["33"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nanomaterials"],"abstract":"<jats:p>Two-dimensional graphitic carbon nitride 2D g-C3N4 has the potential for gas sensing as a metal-free semiconductor with a layered structure, high surface area, and tunability of electronic properties. In this context, 2D g-C3N4 nanosheets were prepared by the thermal polycondensation of urea followed by ultrasonic exfoliation. X-ray diffraction revealed diffraction peaks corresponding to the (110) and (002) crystallographic planes of g-C3N4. Scanning electron microscopy showed a nanosheet structure with a 10-nm crystallite size, while energy-dispersive X-ray spectroscopy demonstrated a uniform distribution of carbon and nitrogen. Ultraviolet\u2013visible absorption spectroscopy revealed a band gap of 2.8 eV. Gas sensing measurements exhibited an increase in response to isopropanol and ethanol as the operating temperature and gas concentration increased. Impedance spectroscopy provided additional insight into the sensing mechanism. Observed depressed semicircles in Nyquist plots were fitted with a charge transfer resistance Rct in parallel with a constant phase element model. The charge transfer resistance Rct fell systematically with isopropanol exposure, confirming the crucial role of adsorption-induced electron transfer in the gas sensing response.<\/jats:p>","DOI":"10.3390\/nano16030213","type":"journal-article","created":{"date-parts":[[2026,2,6]],"date-time":"2026-02-06T10:05:47Z","timestamp":1770372347000},"page":"213","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Alcohol Sensing Behavior and Impedance Spectroscopy Characterization of g-C3N4 Nanosheets"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9937-9078","authenticated-orcid":false,"given":"Cong Doan","family":"Bui","sequence":"first","affiliation":[{"name":"Department of Micro- and Nanoelectronics, Saint Petersburg Electrotechnical University \u201cLETI\u201d, Professora Popova St. 5, Saint Petersburg 197022, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3065-3961","authenticated-orcid":false,"given":"Svetlana","family":"Nalimova","sequence":"additional","affiliation":[{"name":"Department of Micro- and Nanoelectronics, Saint Petersburg Electrotechnical University \u201cLETI\u201d, Professora Popova St. 5, Saint Petersburg 197022, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valery","family":"Kondratev","sequence":"additional","affiliation":[{"name":"Moscow Center for Advanced Studies, Kulakova St. 20, Moscow 123592, Russia"},{"name":"Center for Nanotechnologies, Alferov University, Khlopina St. 8\/3, Saint Petersburg 194021, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5738-2626","authenticated-orcid":false,"given":"Zamir","family":"Shomakhov","sequence":"additional","affiliation":[{"name":"Institute of Artificial Intelligence and Digital Technologies, Kabardino-Balkarian State University, Chernyshevsky St. 173, Nalchik 360004, Russia"},{"name":"Institute of Informatics and Regional Management Problems, Kabardino-Balkarian Scientific Center RAS, Balkarova St. 2, Dolinsk 360002, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Svetlana","family":"Kirillova","sequence":"additional","affiliation":[{"name":"Department of Physical Chemistry, Saint Petersburg Electrotechnical University \u201cLETI\u201d, Professora Popova 5, Saint Petersburg 197022, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0195-8870","authenticated-orcid":false,"given":"Alexander","family":"Maximov","sequence":"additional","affiliation":[{"name":"Department of Micro- and Nanoelectronics, Saint Petersburg Electrotechnical University \u201cLETI\u201d, Professora Popova St. 5, Saint Petersburg 197022, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6500-5492","authenticated-orcid":false,"given":"Vyacheslav","family":"Moshnikov","sequence":"additional","affiliation":[{"name":"Department of Micro- and Nanoelectronics, Saint Petersburg Electrotechnical University \u201cLETI\u201d, Professora Popova St. 5, Saint Petersburg 197022, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,2,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2420393","DOI":"10.1002\/adfm.202420393","article-title":"Enhancing Selectivity of Two-Dimensional Materials-Based Gas Sensors","volume":"35","author":"Yang","year":"2025","journal-title":"Adv. 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