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Fabrication and characterization of thin film CdO nanoparticles for gas sensing applications

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Abstract

The CdO thin films, with their high electrical conductivity and transparency, have attracted significant interest for solar cells, gas sensors, and electronic devices. This study investigates the structural, optical, and complex impedance spectroscopy characteristics of CdO thin films fabricated using nebulizer spray pyrolysis. The films exhibit a well-crystallized cubic structure with a preferred orientation along the (200) plane. Increasing substrate temperature leads to larger grain sizes and improved crystallinity. The CdO films demonstrate high transparency in the visible spectrum and exhibit a direct band gap ranging from 3 eV to 1.9 eV. Gas sensing experiments reveal that the CdO films exhibit sensitivity to ammonia gas, with impedance measurements indicating that the detection is facilitated by the grain boundary resistance. The CdO sensor device shows excellent sensitivity to ammonia, particularly at a temperature of 400 °C, and an appropriate frequency range is identified for optimal sensitivity. These findings demonstrate the potential of CdO thin films for gas sensing applications.

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Acknowledgements

The authors would like to express their gratitude to the University Grants Commission-South Eastern Regional Office (UGC-SERO), Hyderabad (India), for providing financial support through project No. MRP-4892/14 (SERO/UGC). They would also like to acknowledge the support of Adhiyamaan College of Engineering (Autonomous), Hosur, Krishnagiri.

Funding

This article was funded by University Grants Commission, MRP-4892/14 (SERO/UGC), Mariappan R.

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Authors and Affiliations

  1. Department of Physics, Periyar University Centre for Post Graduate and Research Studies, Dharmapuri, 635 205, Tamilnadu, India

    B. Amudhavalli & M. Prasath

  2. Department of Physics, Adhiyamaan College of Engineering, Krishnagiri, Hosur, 635109, Tamilnadu, India

    R. Mariappan & R. N. Jayaprakash

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  1. B. Amudhavalli
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  2. R. Mariappan
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Contributions

BA conducted most experiments and some data analysis (Data curation; Formal Analysis; Visualization). MP helped with data organization, characterization, analysis and drafted an initial manuscript (Data curation; Formal Analysis; Writing–original draft; Visualization). RM conceived the idea, supervised the study, and rewrote the manuscript (Conceptualization; Formal Analysis; Methodology; Supervision; Funding Acquisition; Writing–review & editing; Visualization).

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Correspondence to R. Mariappan or M. Prasath.

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Amudhavalli, B., Mariappan, R., Prasath, M. et al. Fabrication and characterization of thin film CdO nanoparticles for gas sensing applications. J Mater Sci: Mater Electron 35, 547 (2024). https://doi.org/10.1007/s10854-024-12240-0

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