{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,26]],"date-time":"2026-09-26T17:03:16Z","timestamp":1790442196245,"version":"4.1.0"},"reference-count":28,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2013,2,5]],"date-time":"2013-02-05T00:00:00Z","timestamp":1360022400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this work; resistive moisture sensors were obtained by dip coating sulfonated polycarbonate (SPC) onto silver interdigitated electrodes. Commercial polycarbonate was sulfonated with acetyl sulphate at two different sulfonation degrees corresponding to 9.0 and 18.0 mole %. Impedance spectroscopy was used to investigate the humidity sensing properties at controlled relative humidity (RH%) environments generated from standard saline solutions in the range of 11\u201390 RH%. For the highest sulfonated sample; in the RH% range investigated (11 to 90%); the sensor impedance changed from 4.7 M\u03a9 to  18 k\u03a9. Humidity sensors made from sulfonated polycarbonate showed exponential decay behavior of the impedance at constant frequency with the environmental relative humidity. Sample 9SPC presented dielectric relaxation response for environmental humidity between 58 and 90 RH% while sample 18SPC presented dielectric relaxation response for the entire measured range between 11 and 90 RH%. Sulfonated polycarbonate could be a promising material for the fabrication of simple and cheap humidity-sensing sensors for the assessment of relative humidity of the surrounding environment, as suggested by experimental results.<\/jats:p>","DOI":"10.3390\/s130202023","type":"journal-article","created":{"date-parts":[[2013,2,5]],"date-time":"2013-02-05T11:11:11Z","timestamp":1360062671000},"page":"2023-2032","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Characterization of a Sulfonated Polycarbonate Resistive Humidity Sensor"],"prefix":"10.3390","volume":"13","author":[{"given":"Carla","family":"Rubinger","sequence":"first","affiliation":[{"name":"Departamento de F\u00edsica e Qu\u00edmica, Instituto de Ci\u00eancias, Universidade Federal de Itajub\u00e1, CP 50, 37500-903, Itajub\u00e1-MG, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hallen","family":"Calado","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica, ICEx, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte-MG, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rero","family":"Rubinger","sequence":"additional","affiliation":[{"name":"Departamento de F\u00edsica e Qu\u00edmica, Instituto de Ci\u00eancias, Universidade Federal de Itajub\u00e1, CP 50, 37500-903, Itajub\u00e1-MG, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Henrique","family":"Oliveira","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica, ICEx, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte-MG, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claudio","family":"Donnici","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica, ICEx, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte-MG, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2013,2,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"590","DOI":"10.1016\/j.talanta.2008.12.014","article-title":"Electrical and humidity characterization of m-NA doped Au\/PVA nanocomposites","volume":"78","author":"Fuke","year":"2009","journal-title":"Talanta"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"347","DOI":"10.1016\/j.snb.2006.12.048","article-title":"A highly water-resistive humidity sensor based on silicon containing polyelectrolytes prepared by one-pot method","volume":"124","author":"Lv","year":"2007","journal-title":"Sens. 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