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Porous Anatase TiO2 Thin Films for NH3 Vapour Sensing

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Abstract

Anatase titanium dioxide (TiO2) thin films were deposited onto cleaned glass substrates by a direct current (DC) reactive magnetron sputtering technique for different deposition times from 10 min to 40 min, which resulted in films of different thicknesses. Characterization techniques, such as x-ray diffraction (XRD) and field emission-scanning electron microscopy (FE-SEM) were used to characterize the structural and morphological properties of the TiO2 thin films. XRD patterns showed the formation of (101) crystal anatase facets. The grain size values of the film increased with increased deposition time, and the films deposited at 40 min exhibited a porous structure. Anatase TiO2 thin films exhibited excellent sensing response, fast response and recovery time, as well as good stability and selectivity towards ammonia (NH3). The enhanced NH3 sensing behavior of anatase TiO2 films is attributed to the porous morphology and oxygen vacancies.

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Authors and Affiliations

  1. Functional Nanomaterials & Devices Lab, ASK-1116, Centre for Nanotechnology & Advanced Biomaterials and School of Electrical & Electronics Engineering, SASTRA University, Thanjavur, 613 401, India

    Dhivya Ponnusamy & Sridharan Madanagurusamy

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  1. Dhivya Ponnusamy
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  2. Sridharan Madanagurusamy
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Correspondence to Sridharan Madanagurusamy.

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Ponnusamy, D., Madanagurusamy, S. Porous Anatase TiO2 Thin Films for NH3 Vapour Sensing. J. Electron. Mater. 44, 4726–4733 (2015). https://doi.org/10.1007/s11664-015-4099-4

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  • DOI: https://doi.org/10.1007/s11664-015-4099-4

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