Dealloyed nanoporous platinum films: synthesis, characterization, and hydrogen sensing properties

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dc.contributor.authorSener, Melike
dc.contributor.authorAltuntepe, Ali
dc.contributor.authorZan, Recep
dc.contributor.authorKilinc, Necmettin
dc.date.accessioned2026-04-04T13:31:18Z
dc.date.available2026-04-04T13:31:18Z
dc.date.issued2025
dc.departmentİnönü Üniversitesi
dc.description.abstractNanoporous platinum (Pt) films are synthesized at room temperature using a straightforward and cost-effective dealloying technique. This method is suitable for producing various nanoporous materials for diverse applications. Copper (Cu) atoms in the PtCu alloy films were selectively dissolved in a nitric acid solution, at varying times, to obtain nanoporous films. PtCu alloy thin films were then deposited onto a glass substrate utilizing the magnetron co-sputtering method with approximately 50 nm thickness. After 20 h dealloying in the acid solution, the residual Cu content in the alloy was less than 1% (atomic rate), and a regular nanoporous Pt structure was observed. The hydrogen detection properties of the nanoporous Pt films thus produced were investigated at various temperatures within a concentration range between 10 ppm and 5% hydrogen. The results demonstrated that a very high sensor response of 64 was obtained for the first exposure to 1% hydrogen at 150 degrees C, but the nanoporous Pt sensor resistance did not return to the baseline resistance. To utilize this nanoporous Pt film as a reversible hydrogen sensor, the film must be pre-exposed to hydrogen. After pre-exposure, the sensor response of the as-prepared nanoporous Pt was approximately 4.5, resulting from exposure to 1% hydrogen at 150 degrees C, and the limit of detection was lower than 10 ppm. Data regarding the mechanism of the nanoporous Pt sensor device were clarified through surface scattering. The main contributions of this research are that sensing nanoporous film has a high surface-to-volume ratio, the sensor exhibited a very high initial response (similar to 64) to 1% hydrogen at 150 degrees C, the sensor mechanism is governed by surface scattering, and pre-exposure to hydrogen is needed for reversible sensing operation in practical usage.
dc.description.sponsorshipScientific and Technological Research Council of Trkiye (TUBITAK) [121M681]
dc.description.sponsorshipThe author(s) declare that financial support was received for the research and/or publication of this article. This study was supported by the Scientific and Technological Research Council of Turkiye (TUBITAK) with a project number of 121M681.
dc.identifier.doi10.3389/fnano.2025.1599264
dc.identifier.issn2673-3013
dc.identifier.orcid0000-0001-6739-4348
dc.identifier.scopus2-s2.0-105015091034
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.3389/fnano.2025.1599264
dc.identifier.urihttps://hdl.handle.net/11616/108701
dc.identifier.volume7
dc.identifier.wosWOS:001564527200001
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherFrontiers Media Sa
dc.relation.ispartofFrontiers in Nanotechnology
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WOS_20250329
dc.subjectnanoporous
dc.subjectplatinum
dc.subjectdealloying method
dc.subjectco-sputtering
dc.subjecthydrogen sensor
dc.subjectresistive sensor
dc.titleDealloyed nanoporous platinum films: synthesis, characterization, and hydrogen sensing properties
dc.typeArticle

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