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ZnO-activated SnO2–TiO2 ternary nanocomposite based highly selective formaldehyde sensor at room temperature

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Abstract

Researchers highlight the field of nanosized semiconducting oxide gas sensors because of threats to the atmosphere and health of humans. In this work, Zn-doped SnO2–TiO2 ternary nanocomposites were synthesized via the method of co-precipitation and hydrothermal method. Stannic chloride, titanium isopropoxide and zinc nitrate were used as precursors. Ternary nanocomposites with different composition of ZnO-doped SnO2–TiO2 were obtained and named as STZ1, STZ2 and STZ3. The characterization studies of ternary nanocomposites were determined by X-ray diffractogram, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy and UV-diffused reflectance spectroscopy (UV-DRS) analyses. To construct sensing devices, STZ1, STZ2 and STZ3 were coated on glass substrate as a thick film via doctor blade method. The STZ2 fabricated sensor shows the best selectivity to formaldehyde and attains maximum sensitivity at 100 ppm of gas concentration and at 10 ppm response time and recovery time was 8 s and 9 s, respectively, at room temperature.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We thank Dr. K. Jeyadeepan, Assistant Professor (Research), Multifunctional Materials & Devices Lab, SASTRA University, Thanjavur, Tamil Nadu for providing gas-sensing setup Lab.

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Authors and Affiliations

  1. Department of Electronics, DKGAC, Affiliated to Bharathidasan University, Kulithalai, 639120, India

    V. Vidhya & P. Anbarasu

  2. Department of Electronics, GAC, Affiliated to Bharathidasan University, Trichy, 620 022, India

    V. Vidhya

  3. Department of Physics, Annamalai University, Chidambaram, 60800, India

    D. Geetha

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  1. V. Vidhya
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by [VV], [PA] and [DG]. The first draft of the manuscript was written by [VV] and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to V. Vidhya.

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Vidhya, V., Anbarasu, P. & Geetha, D. ZnO-activated SnO2–TiO2 ternary nanocomposite based highly selective formaldehyde sensor at room temperature. Appl. Phys. A 129, 382 (2023). https://doi.org/10.1007/s00339-023-06633-x

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