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Tungsten Oxide Thin Film Characterizations for Acetone Gas Detection

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Abstract

The gas sensing properties and topology of tungsten oxide thin films deposited by reactive-ion radio frequency magnetron sputtering at room temperature have been investigated. The abnormalities in behaviour of sensing film are observed when acetone gas is flowed over surface. The reduction reaction of surface and oxidation reaction of acetone gas have been studied. As the gas comes in contact with the surface, the molecules tend to reduce the surface, hence decreasing the resistance. The sensing film was annealed to 500 °C for 1 h for the purpose of achieving a suitable grain size for sensing to take place. Operational optimum temperature for sensing has been computed to be 260 °C. A grain size of 7.3 nm has been computed through analysis of AFM image and a film thickness of 100 nm has been calculated through surface profiler. The SEM image of the film demonstrates the grains developed on the surface. The XRD patterns reveal that the oxide showed up as WO2. It has been observed that the response percentage is approximately 30% for acetone vapour concentration of 20 ppm and approximately 18% for the concentration of 15 ppm. The response time of the sensor is approximately 5 min and the recovery time is 4 min.

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Acknowledgements

Authors are thankful to the Dr. PrakashGopalan, Director, Thapar University, Patiala and Prof. SantanuChaudhury, Director, CSIR-CEERI, Pilani for providing the research facilities. Financial support provided by Department of Science and Technology (DST-INSPIRE Fellowship), New Delhi, Govt. of India is gratefully acknowledged.

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Authors and Affiliations

  1. CSIR—Central Electronics Engineering Research Institute, Pilani, 333031, India

    Ajay Agarwal

  2. Thapar University, Patiala, Punjab, 147001, India

    Smiti Sachdeva & Ravinder Agarwal

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  1. Smiti Sachdeva
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Correspondence to Smiti Sachdeva.

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Sachdeva, S., Agarwal, A. & Agarwal, R. Tungsten Oxide Thin Film Characterizations for Acetone Gas Detection. MAPAN 33, 57–62 (2018). https://doi.org/10.1007/s12647-017-0233-5

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