{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,20]],"date-time":"2025-12-20T13:59:12Z","timestamp":1766239152274,"version":"3.48.0"},"reference-count":39,"publisher":"IOP Publishing","issue":"46","license":[{"start":{"date-parts":[[2020,8,28]],"date-time":"2020-08-28T00:00:00Z","timestamp":1598572800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/publishingsupport.iopscience.iop.org\/iop-standard\/v1"},{"start":{"date-parts":[[2020,8,28]],"date-time":"2020-08-28T00:00:00Z","timestamp":1598572800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"funder":[{"DOI":"10.13039\/501100013343","name":"NCPRE","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100013343","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["Nanotechnology"],"published-print":{"date-parts":[[2020,11,13]]},"abstract":"Abstract<\/jats:title>\n \n In this work, we report an ultra-high sensitive (\n S\u2009<\/jats:italic>\n =\u20091.4\u2009\u00d7\u200910\n 8<\/jats:sup>\n %), prompt response and recovering Pt\/Pt+SiO\n 2<\/jats:sub>\n cermet layer\/GaN-based hydrogen (H\n 2<\/jats:sub>\n ) sensor. A sensor fabricated with a 15 nm cermet layer, comprising Pt and SiO\n 2<\/jats:sub>\n , deposited between 15 nm Pt and GaN layers, exhibits significantly enhanced sensitivity in the detection of 4 %H\n 2<\/jats:sub>\n by \u2248 300\u00d7, as compared to the reference Pt\/GaN sensor at ambient temperature (300 K). Furthermore, the sensitivity of the our sensor shows very weak dependence on temperature (T) with maximum sensitivity (\n \n \n \n <\/jats:tex-math>\n \n \n S<\/mml:mi>\n \n \n m<\/mml:mi>\n a<\/mml:mi>\n x<\/mml:mi>\n <\/mml:mrow>\n <\/mml:mrow>\n <\/mml:msub>\n <\/mml:math>\n <\/jats:inline-formula>\n ) reducing from 1.4 \u00d7 10\n 8<\/jats:sup>\n % to 2.3 \u00d7 10\n 7<\/jats:sup>\n % as temperature increases from 300 to 423 K. The shift in the threshold voltage of the test sensor (\u0394\n V<\/jats:italic>\n \n t<\/jats:italic>\n ,\n test<\/jats:italic>\n <\/jats:sub>\n = 767 mV) increases by 50 % as compared to the shift in threshold voltage of the control sensor (\u0394\n V<\/jats:italic>\n \n t<\/jats:italic>\n ,\n control<\/jats:italic>\n <\/jats:sub>\n = 511 mV) at 1 mA\/cm\n 2<\/jats:sup>\n . In addition, the cermet sensor also demonstrates fast response\/recovery time, which reduces from 4.58 (2.36) seconds to 94 (39) milliseconds as the temperature increases from\n 300<\/jats:italic>\n to 423 K. The maximum sensitivity (\n \n \n \n <\/jats:tex-math>\n \n \n S<\/mml:mi>\n \n \n m<\/mml:mi>\n a<\/mml:mi>\n x<\/mml:mi>\n <\/mml:mrow>\n <\/mml:mrow>\n <\/mml:msub>\n <\/mml:math>\n <\/jats:inline-formula>\n ), response (\n \u03c4<\/jats:italic>\n \n a<\/jats:italic>\n <\/jats:sub>\n ) and recovery (\n \u03c4<\/jats:italic>\n \n b<\/jats:italic>\n <\/jats:sub>\n ) times of the test sensor when exposed to 10\u2009000 ppm of H\n 2<\/jats:sub>\n are 3.9 \u00d7 10\n 7<\/jats:sup>\n %, 30 secs and 30.1 secs respectively. The shift in the threshold voltage of the test sensor at 1 mA\/cm\n 2<\/jats:sup>\n when exposed to 100 ppm, 1000 ppm, 5000 ppm, and 10\u2009000 ppm are 40 mV, 70 mV, 460 mV, and 600 mV, respectively. The 2-Dimensional (2D) trapping of H-atoms by the oxygen atoms present in the Pt+SiO\n 2<\/jats:sub>\n cermet layer and porous\/compact layer models explains the underlying mechanism, which results in a significant improvement of the sensing characteristics of the test sensor. The Thermionic Emission (TE) model effectively models the current density (J) - voltage (V) characteristics of both control and test sensors, with and without hydrogen. The prompt detection of high percentages of hydrogen in life-saving and commercial fuel applications becomes possible with the Pt+SiO\n 2<\/jats:sub>\n cermet-based sensor, with its response and recovery times in the order of milliseconds for a temperature range of 363\u2013423 K.\n <\/jats:p>","DOI":"10.1088\/1361-6528\/abac33","type":"journal-article","created":{"date-parts":[[2020,8,4]],"date-time":"2020-08-04T18:30:16Z","timestamp":1596565816000},"page":"46LT02","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Ultra high-sensitive, prompt response and recovering Pt\/(Pt+\n SiO<\/i>\n 2<\/sub>\n ) cermet layer\/GaN-based hydrogen sensor for life-saving applications"],"prefix":"10.1088","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4160-0649","authenticated-orcid":false,"given":"V S Santhosh N Varma.","family":"Bellamkonda","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Brij","family":"Mohan Arora","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6194-7212","authenticated-orcid":false,"given":"Seshasainadh","family":"Pudi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9843-6539","authenticated-orcid":false,"given":"Swagata","family":"Bhunia","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7320-642X","authenticated-orcid":false,"given":"Apurba","family":"Laha","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"266","published-online":{"date-parts":[[2020,8,28]]},"reference":[{"key":"nanoabac33bib1","doi-asserted-by":"publisher","first-page":"152","DOI":"10.1126\/science.1166304","type":"journal-article","article-title":"Hyperbaric hydrogen therapy: a possible treatment for cancer","volume":"190","author":"Dole","year":"1975","journal-title":"Science"},{"key":"nanoabac33bib2","doi-asserted-by":"publisher","first-page":"788","DOI":"10.1016\/j.biopha.2018.05.055","type":"journal-article","article-title":"Hydrogen gas inhibits lung cancer progression through targeting smc3","volume":"104","author":"Wang","year":"2018","journal-title":"Biomed. 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All rights, including for text and data mining, AI training, and similar technologies, are reserved.","name":"copyright_information","label":"Copyright Information"},{"value":"2020-07-08","name":"date_received","label":"Date Received","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2020-08-04","name":"date_accepted","label":"Date Accepted","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2020-08-28","name":"date_epub","label":"Online publication date","group":{"name":"publication_dates","label":"Publication dates"}}]}}