{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,27]],"date-time":"2026-03-27T16:08:57Z","timestamp":1774627737017,"version":"3.50.1"},"reference-count":31,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2016,12,6]],"date-time":"2016-12-06T00:00:00Z","timestamp":1480982400000},"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>An inkjet-printed, fully passive sensor capable of either humidity or gas sensing is presented herein. The sensor is composed of an interdigitated electrode, a customized printable gas sensitive ink and a specialized dipole antenna for wireless sensing. The interdigitated electrode printed on a paper substrate provides the base conductivity that varies during the sensing process. Aided by the porous nature of the substrate, a change in relative humidity from 18% to 88% decreases the electrode resistance from a few Mega-ohms to the kilo-ohm range. For gas sensing, an additional copper acetate-based customized ink is printed on top of the electrode, which, upon reaction with hydrogen sulphide gas (H2S) changes, both the optical and the electrical properties of the electrode. A fast response time of 3 min is achieved at room temperature for a H2S concentration of 10 ppm at a relative humidity (RH) of 45%. The passive wireless sensing is enabled through an antenna in which the inner loop takes care of conductivity changes in the 4\u20135 GHz band, whereas the outer-dipole arm is used for chipless identification in the 2\u20133 GHz band.<\/jats:p>","DOI":"10.3390\/s16122073","type":"journal-article","created":{"date-parts":[[2016,12,6]],"date-time":"2016-12-06T10:07:17Z","timestamp":1481018837000},"page":"2073","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":63,"title":["Disposable, Paper-Based, Inkjet-Printed Humidity and H2S Gas Sensor for Passive Sensing Applications"],"prefix":"10.3390","volume":"16","author":[{"given":"Abdul","family":"Quddious","sequence":"first","affiliation":[{"name":"Research Institute for Microwave and Millimeterwave Studies (RIMMS), National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shuai","family":"Yang","sequence":"additional","affiliation":[{"name":"Computer, Electrical and Mathematical Sciences and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Munawar","family":"Khan","sequence":"additional","affiliation":[{"name":"Research Institute for Microwave and Millimeterwave Studies (RIMMS), National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Farooq","family":"Tahir","sequence":"additional","affiliation":[{"name":"Research Institute for Microwave and Millimeterwave Studies (RIMMS), National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Atif","family":"Shamim","sequence":"additional","affiliation":[{"name":"Computer, Electrical and Mathematical Sciences and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Khaled","family":"Salama","sequence":"additional","affiliation":[{"name":"Computer, Electrical and Mathematical Sciences and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hammad","family":"Cheema","sequence":"additional","affiliation":[{"name":"Research Institute for Microwave and Millimeterwave Studies (RIMMS), National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2016,12,6]]},"reference":[{"key":"ref_1","unstructured":"(2010). 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