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Synthesis of nanoporous platinum thin films and application as hydrogen sensor

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Abstract

A nanoporous platinum (np-Pt) thin film based hydrogen sensor was fabricated and studied. The np-Pt thin films were fabricated through a method of chemical dealloying and coarsening starting from a CuPt alloy. The alloy thin films of CuxPt1−x were deposited by sputtering copper and platinum at the same time. The dealloying process completely removed the copper from the film. We demonstrate a method to control the porosity of np-Pt by a method of coarsening. Scanning electron microscopy confirmed the presence of porosity with size ranging from a few nanometers to tens of nanometers. A sensor device with four electrodes was fabricated on the np-Pt thin films using a stainless steel mask and by sputtering copper. The electrical characteristics of the sensor exhibit marked sensitivity or current changes in the presence of hydrogen. The results demonstrate that np-Pt thin films configured as a gas sensor have high sensitivity to hydrogen.

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Acknowledgments

FESEM, EDS data from Franklin Bailey, Center for Electron Microscopy & Microanalysis, University of Idaho is acknowledged. This work was partially supported by the National Science Foundation grant NSF PHY-0754360.

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Authors and Affiliations

  1. Department of Physics, University of Idaho, PO Box 440903, Moscow, ID, 83844-0903, USA

    Aditya Abburi, Nathan Abrams & Wei Jiang Yeh

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  1. Aditya Abburi
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  2. Nathan Abrams
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  3. Wei Jiang Yeh
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Correspondence to Aditya Abburi.

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Abburi, A., Abrams, N. & Yeh, W.J. Synthesis of nanoporous platinum thin films and application as hydrogen sensor. J Porous Mater 19, 543–549 (2012). https://doi.org/10.1007/s10934-011-9503-8

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  • DOI: https://doi.org/10.1007/s10934-011-9503-8

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