{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,27]],"date-time":"2026-06-27T00:57:54Z","timestamp":1782521874197,"version":"3.54.5"},"reference-count":26,"publisher":"MDPI AG","issue":"14","license":[{"start":{"date-parts":[[2019,7,16]],"date-time":"2019-07-16T00:00:00Z","timestamp":1563235200000},"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>In this paper, the PdOx nanoparticles modified SnO2 are prepared using sputtering and wet chemical methods. The SnO2 nanoparticles are separately added to a concentration of 0.75% to 10% PdCl2 to obtain a PdCl2\/SnO2 composite material, which is calcined for 1 to 2 h at the temperatures of 120 \u00b0C, 250 \u00b0C, 450 \u00b0C and 600 \u00b0C. The PdOx\/SnO2 nanocomposite was characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffractometry (XRD) and transmission electron microscopy (TEM). Microstructural observations revealed PdOx with different chemical states attached to the surface of SnO2. Hydrogen response change tests were performed on the obtained PdOx\/SnO2 gas sensing materials. The results show that the high gas sensing performance may be attributed to the contribution of the PdOx-loaded SnO2. In hydrogen, the best sensitivity response was attained at 80 \u00b0C, which is 60 times that of pristine SnO2. It clarifies the role of PdOx in the gas sensing mechanisms.<\/jats:p>","DOI":"10.3390\/s19143131","type":"journal-article","created":{"date-parts":[[2019,7,17]],"date-time":"2019-07-17T02:44:03Z","timestamp":1563331443000},"page":"3131","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Effects of Chemical State of the Pd Species on H2 Sensing Characteristics of PdOx\/SnO2 Based Chemiresistive Sensors"],"prefix":"10.3390","volume":"19","author":[{"given":"Tianjiao","family":"Qi","sequence":"first","affiliation":[{"name":"Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621999, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jie","family":"Sun","sequence":"additional","affiliation":[{"name":"Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621999, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xi","family":"Yang","sequence":"additional","affiliation":[{"name":"Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621999, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fanfan","family":"Yan","sequence":"additional","affiliation":[{"name":"Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621999, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ji","family":"Zuo","sequence":"additional","affiliation":[{"name":"Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621999, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2019,7,16]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"438","DOI":"10.1016\/j.snb.2015.12.077","article-title":"Room temperature hydrogen sensor with ultrahigh-responsive characteristics based on Pd\/SnO2\/SiO2\/Si heterojunctions","volume":"1","author":"Ling","year":"2016","journal-title":"Sens. Actuators B"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"354","DOI":"10.1016\/j.matlet.2014.04.173","article-title":"Novel hydrogen gas sensor based on Pd and SnO2 nanoclusters","volume":"128","author":"Ayesh","year":"2014","journal-title":"Mater. Lett."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"10006","DOI":"10.1016\/j.ceramint.2016.03.103","article-title":"Gas-sensing properties and mechanisms of Cu-doped SnO2 spheres towards H2S","volume":"8","author":"Wang","year":"2016","journal-title":"Ceram. Int."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"202","DOI":"10.1016\/j.snb.2015.09.091","article-title":"NH3 gas sensor based on Pd\/SnO2\/RGO ternary composite operated at room-temperature","volume":"223","author":"Su","year":"2016","journal-title":"Sens. Actuators B"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"113","DOI":"10.1016\/j.physe.2015.12.002","article-title":"XPS studies and photocurrent applications of alkali-metals-doped ZnO nanoparticles under visible illumination conditions","volume":"79","author":"Yousefi","year":"2016","journal-title":"Phys. E"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"271","DOI":"10.1016\/S0040-6090(02)00619-3","article-title":"Fabrication and characteristics of SnO2 gas sensor array for volatile organic compounds recognition","volume":"416","author":"Lee","year":"2002","journal-title":"Thin Solid Films"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"12572","DOI":"10.1016\/j.ijhydene.2015.07.070","article-title":"Effects of gamma irradiation on hydrogen gas-sensing characteristics of Pd-SnO2 thin film sensors","volume":"40","author":"Toan","year":"2015","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"223","DOI":"10.1016\/0925-4005(96)80053-0","article-title":"Microstructure evolution and gas sensitivities of Pd-doped SnO2-based sensor prepared by three different catalyst-addition processes","volume":"30","author":"Lim","year":"1996","journal-title":"Sens. Actuators B"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"115","DOI":"10.1016\/S0040-6090(03)00505-4","article-title":"Sensitivity of the PtO\/SnO2 and PdO\/SnO2 layer structures: Kelvin probe and XPS analysis","volume":"436","author":"Kissa","year":"2003","journal-title":"Thin Solid Films"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"1602","DOI":"10.1016\/j.solidstatesciences.2009.06.014","article-title":"Sensing mechanism of Pd-doped SnO2 sensor for LPG detection","volume":"11","author":"Srivastava","year":"2009","journal-title":"Solid State Sci."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"83","DOI":"10.1016\/j.snb.2014.05.071","article-title":"The sensing mechanism of Pt-doped SnO2 surface toward CO: A first-principle study","volume":"202","author":"Li","year":"2014","journal-title":"Sens. Actuators B"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"893","DOI":"10.1016\/j.snb.2012.10.087","article-title":"Ultra-sensitive H2 sensors based on flame-spray-made Pd-loaded SnO2 sensing films","volume":"176","author":"Liewhiran","year":"2013","journal-title":"Sens. Actuators B"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"831","DOI":"10.1134\/S0036024414050227","article-title":"Stability of semiconductor sensors based on nanosized SnO2 and Pd\/SnO2","volume":"88","author":"Oleksenko","year":"2014","journal-title":"Russ. J. Phys. Chem. A"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"797","DOI":"10.1126\/science.aaf5251","article-title":"Photochemical route for synthesizing atomically dispersed palladium catalysts","volume":"352","author":"Liu","year":"2016","journal-title":"Science"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"690","DOI":"10.1016\/j.jallcom.2015.08.174","article-title":"Preparation of Pd nanoparticle-decorated hollow SnO2 nanofibers and their enhanced formaldehyde sensing properties","volume":"651","author":"Lin","year":"2015","journal-title":"J. Alloys Compd."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"1997","DOI":"10.3866\/PKU.WHXB201508241","article-title":"Preparation and Gas Sensing Properties of PdO, Au, CdO Coatings on SnO2 Nanofibers","volume":"31","author":"Hu","year":"2015","journal-title":"Acta Phys. Chim. Sin"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"257","DOI":"10.1016\/j.snb.2015.07.115","article-title":"Microwave assisted synthesis of hierarchical Pd\/SnO2 nanostructures for CO gas sensor","volume":"222","author":"Wang","year":"2016","journal-title":"Sens. Actuators B"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"770","DOI":"10.1016\/j.snb.2012.11.020","article-title":"Low temperature Pd\/SnO2 sensor for carbon monoxide detection","volume":"177","author":"Kim","year":"2013","journal-title":"Sens. Actuators B"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"179","DOI":"10.1016\/S0926-860X(99)00512-8","article-title":"Catalyst microstructure and methane oxidation reactivity during the Pd\/PdO transformation on alumina supports","volume":"198","author":"Datye","year":"2000","journal-title":"Appl. Catal. A"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"7","DOI":"10.1016\/0925-4005(91)80213-4","article-title":"New approaches for improving semiconductor gas sensors","volume":"5","author":"Yamazoe","year":"1991","journal-title":"Sens. Actuators B"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"475","DOI":"10.1016\/j.apsusc.2015.12.159","article-title":"XPS determination of Mn oxidation states in Mn (hydr)oxides","volume":"366","author":"Iltona","year":"2016","journal-title":"Appl. Surf. Sci."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"9248","DOI":"10.1016\/j.apsusc.2009.07.011","article-title":"X-ray photoelectron spectroscopy study of Pd oxidation by RF discharge in oxygen","volume":"255","author":"Kibis","year":"2009","journal-title":"Appl. Surf. Sci."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"34","DOI":"10.1016\/j.mseb.2005.11.009","article-title":"XPS studies of room temperature magnetic Co-doped SnO2 deposited on Si","volume":"128","author":"Yan","year":"2006","journal-title":"Mater. Sci. Eng. B"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"686","DOI":"10.1016\/j.snb.2017.05.028","article-title":"MoS2 gas sensor functionalized by Pd for the detection of hydrogen","volume":"250","author":"Baek","year":"2017","journal-title":"Sens. Actuators B"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"1876","DOI":"10.1021\/acssensors.8b00834","article-title":"Ultrasmall Grained Pd Nanopattern H2 Sensor","volume":"3","author":"Cho","year":"2018","journal-title":"ACS Sens."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"15331","DOI":"10.1039\/C8DT01980K","article-title":"The H2 sensing properties of facets-dependent Pd nanoparticles-supported ZnO nanorods","volume":"47","author":"Tang","year":"2018","journal-title":"Dalton Trans."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/19\/14\/3131\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T13:06:09Z","timestamp":1760187969000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/19\/14\/3131"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2019,7,16]]},"references-count":26,"journal-issue":{"issue":"14","published-online":{"date-parts":[[2019,7]]}},"alternative-id":["s19143131"],"URL":"https:\/\/doi.org\/10.3390\/s19143131","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2019,7,16]]}}}