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Hydrogen sensing characteristics of Pt–SnO2 nano-structured composite thin films

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Abstract

This paper reports the preparation of Pt–SnO2 composite thin film gas sensors for the detection of H2 gas having lower concentration (150 ppm) at relatively lower operating temperature of 85 °C. Nano crystalline tin oxide (SnO2) thin films were prepared by simple spin coating technique. Subsequently platinum thin film was sputtered over the SnO2 thin film to get the Pt–SnO2 composite thin films. The structural, nano structural and gas sensing properties of both SnO2 and Pt–SnO2 thin film sensor were studied. XRD indicate the formation of tetragonal SnO2 where as in case of Pt–SnO2 the existence of cubic SnPt3 was observed. A comparative study of the hydrogen sensing properties viz. operating temperature, response and recovery time and selectivity was carried out. Due to Pt loading, the sensor showed reduction in the operating temperature to 85 °C with good modulation and response time of 0.5 s to H2 gas. The response to other gases such as carbon monoxide (CO) and LPG (at 150 ppm) of the Pt–SnO2 composite thin film sensor were also investigated. The sensor showed highest response to H2 gas where as lowest response was noted for CO gas.

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Acknowledgments

One of the authors Mrs. Sapana Rane is grateful to Late Prof. R. N. Karekar for his valuable inputs and timely suggestions during this work. She also acknowledges Dr. K. R. Patil, NCL, Pune for XPS analysis and Mr. Saquib for the necessary experimental help.

Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Electronics, Mamasaheb Mohol College, Paud Road, Pune, 411038, India

    Sapana Rane

  2. Department of Electronic Science, Savitribai Phule Pune University, Pune, 411007, India

    Sapana Rane

  3. Centre for Materials for Electronics Technology, Off Pashan Road, Pune, 411008, India

    Sudhir Arbuj & Sunit Rane

  4. Department of Physics, Savitribai Phule Pune University, Pune, 411007, India

    Suresh Gosavi

Authors
  1. Sapana Rane
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  2. Sudhir Arbuj
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  3. Sunit Rane
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  4. Suresh Gosavi
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Correspondence to Sapana Rane or Suresh Gosavi.

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Rane, S., Arbuj, S., Rane, S. et al. Hydrogen sensing characteristics of Pt–SnO2 nano-structured composite thin films. J Mater Sci: Mater Electron 26, 3707–3716 (2015). https://doi.org/10.1007/s10854-015-2889-3

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  • DOI: https://doi.org/10.1007/s10854-015-2889-3

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