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Structural, optical and gas sensing properties of spin coated nanocrystalline zinc oxide thin films

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Abstract

Synthesis of nanocrystalline zinc oxide thin films by sol gel spin coating technique and its application as ammonia gas sensor is presented in this paper. The synthesized sample is pure zinc oxide with hexagonal wurtzite structure. The lattice parameters are: a = 3.2568 Å and c = 5.210 Å. Average crystallite size is of the order of 58 nm. SEM studies show that growth of the film takes place with folded structure, increasing the open surface area of the film. Optical study revealed that band gap of ZnO is 3.25 eV with direct band to band transitions. Gas sensing characteristics showed that ZnO film is sensitive as well as fast responding to ammonia gas at 573 K. A high sensitivity for ammonia gas indicates that the ZnO films are selective for this gas. The rise time and recovery time are 25 and 80 s, respectively. The mechanism of gas sensing is explained adequately.

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Acknowledgments

One of the authors (GSS) is thankful to University Grants Commission (WRO), Pune, for the financial assistance through the Scheme No. F.47-363/07. The authors (RVV and GSS) are also thankful to Dr. V. B. Patil, Department of Physics, Solapur University, Solapur, for useful discussion.

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Authors and Affiliations

  1. Department of Electronic Science, Modern College of Arts, Science and Commerce, Pune, MS, India

    R. V. Vidap

  2. Department of Physics, University of Pune, Pune, MS, India

    V. L. Mathe

  3. Department of Electronics, DBF Dayanand College of Arts and Science, Solapur, MS, India

    G. S. Shahane

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  1. R. V. Vidap
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  2. V. L. Mathe
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  3. G. S. Shahane
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Correspondence to G. S. Shahane.

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Vidap, R.V., Mathe, V.L. & Shahane, G.S. Structural, optical and gas sensing properties of spin coated nanocrystalline zinc oxide thin films. J Mater Sci: Mater Electron 24, 3170–3174 (2013). https://doi.org/10.1007/s10854-013-1223-1

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  • DOI: https://doi.org/10.1007/s10854-013-1223-1

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