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Facile Hydrothermal Synthesis of WO3 Nanoconifer Thin Film: Multifunctional Behavior for Gas Sensing and Field Emission Applications

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Abstract

Well aligned tungsten trioxide (WO3) nanoconifer films were synthesized on tungsten substrates employing a facile hydrothermal treatment. The structural properties of as-synthesized WO3 nanostructure thin films were confirmed by X-ray diffraction micro Raman spectroscopy, whereas surface morphology and elemental composition was revealed using scanning electron microscopy and energy dispersive X-ray spectroscopy. Gas sensing characteristics of the WO3 nanoconifer thin film towards NH3 (ammonia) gas were investigated. The WO3 nanoconifer thin film exhibited maximum sensor response of ~ 51.9% for 300 ppm of NH3 at operating temperature of ~ 175 °C. Interestingly the response and recover times were observed to be 35 and 62 s respectively, which are superior to the reported ones. Further, field emission study of WO3 nanoconifer thin film was carried at the base pressure of ~ 1 × 10−8 mbar. The values of turn-on and threshold fields (corresponding to emission current densities of 1 and 10 µA cm−2) are found to be 2.43 and 3.08 V µm−1, respectively. The WO3 nanoconifer thin film emitter delivered maximum current density of ~ 118.57 µA cm−2 at an applied field of 4.29 V µm−1. The emission current was observed to be fairly stable over duration four hours at a preset value ~ 2 µA, characterized with standard deviation around 7.86%. The observed FE characteristics are comparable to other semiconducting metal oxide nanostructures thin film emitters. The present results imply WO3 nanoconifer as a promising candidate for potential applications in gas sensing as well as field emission based applications in vacuum microelectronic devices.

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Acknowledgements

Authors, gratefully acknowledges for financial support from BARC Mumbai, for the SRF award under DAE-BRNS (Board of Research in Nuclear Sciences) (Sanction No. 34/14/61/2014-BRNS) research project scheme. Also authors acknowledges to Fergusson College, Pune for providing research facility.

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Authors and Affiliations

  1. Department of Physics, Fergusson College Affiliated to Savitribai Phule Pune University, Pune, 411004, India

    Pankaj S. Kolhe, Parisee S. Shirke & Kishor M. Sonawane

  2. Department of Physics, Centre for Advanced Studies in Materials Science and Condensed Matter Physics, Savitribai Phule Pune University, Pune, 411007, India

    Mahendra A. More

  3. Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India

    Namita Maiti

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  1. Pankaj S. Kolhe
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  2. Parisee S. Shirke
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Correspondence to Mahendra A. More or Kishor M. Sonawane.

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Kolhe, P.S., Shirke, P.S., Maiti, N. et al. Facile Hydrothermal Synthesis of WO3 Nanoconifer Thin Film: Multifunctional Behavior for Gas Sensing and Field Emission Applications. J Inorg Organomet Polym 29, 41–48 (2019). https://doi.org/10.1007/s10904-018-0962-0

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