ORIGINAL RESEARCH article
Front. Nanotechnol.
Sec. Nanomaterials
Volume 7 - 2025 | doi: 10.3389/fnano.2025.1599264
Dealloyed nanoporous platinum films: synthesis, characterization and hydrogen sensing properties
Provisionally accepted
- 1Department of Physics, Faculty of Science & Arts, Inonu University, Malatya, Türkiye
- 2Sivas University of Science and Technology, Sivas, Sivas, Türkiye
- 3Department of Physics, Faculty of Science & Arts, Niğde Ömer Halisdemir University, Nigde, Türkiye
- 4İnönü University, Malatya, Türkiye
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Nanoporous 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 are selectively dissolved in a nitric acid solution, depending on the time, to obtain nanoporous films. PtCu alloy thin films are deposited on the glass substrate utilizing the magnetron co-sputtering method with approximately 50 nm thickness. After 20 hours of dealloying in the acid solution, the residual Cu content in the alloy is less than 1% (atomic rate), and a regular nanoporous Pt structure is observed. The hydrogen detection properties of the produced nanoporous Pt films are 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 is obtained for the first exposure to 1% hydrogen at 150℃, 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 to hydrogen, the sensor response of the as-prepared nanoporous Pt was approximately 4.5, resulting from the exposure to 1% hydrogen at 150℃, and the limit of detection is lower than 10 ppm. Data regarding the mechanism of the nanoporous Pt sensor device are clarified through surface scattering. In summary, the main contributions of this research are that the sensing nanoporous film has a high surface to volume ratio, the sensor exhibited a very high initial response (~64) toward 1% hydrogen at 150 °C, the sensor mechanism is governed by surface scattering and pre-exposure to hydrogen is needed for reversible sensing operation in practical usability.
Keywords: Nanoporous, Platinum, Dealloying method, Co-sputtering, Hydrogen sensor, Resistive sensor
Received: 24 Mar 2025; Accepted: 23 Jul 2025.
Copyright: © 2025 Sener, Altuntepe, Zan and Kilinc. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Necmettin Kilinc, İnönü University, Malatya, Türkiye
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