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Effect of doping concentration of Cu2+ ion on ZnO thin film for detection of CO gas

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Abstract

In the present work, CO gas sensor based on ZnO (non-annealed) and ZnO:Cu (post-annealed) were prepared using chemical bath deposition technique using Zinc Nitrate Hexahydrate (AR), triethanolamine (AR), and sodium hydroxide (AR) as the source materials and Copper Nitrate Hexahydrate as source of the dopant and the prepared films were deposited on to the glass substrate. The prepared films were characterized by XRD (X-ray diffraction), SEM (Scanning Electron Microscope), EDAX, and UV–visible spectroscopy. The crystallite size was found to decrease on doping Cu. The formation of ZnO nanorods and nanospheroidals of ZnO:Cu was observed. The compositional analysis was done by EDAX. The band gap energy of the prepared film was found to vary from 3.9 eV to 3.6 eV. The electrical and CO gas sensing properties of thin films were also investigated. The response and recovery time of chemically synthesized ZnO thin films to CO gas were observed. A prototype based on the prepared sample is designed with the help of the Arduino UNO.

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Data availability

Data sets generated during the current study may be available from the corresponding author on reasonable request. All the data are obtained after measurement of synthesized sample in the sophisticated analytical instrumentation facility centers like Physics Department, Manipur University, Department of Electronics Dhanamanjuri University, Manipur, and CRF NITK, Karnataka.

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Acknowledgements

The authors are thankful to Nanoelectronics Research Laboratory, Department of Electronics, D.M. College of Science, Imphal for synthesis of sample, I–V measurement, prototype design, UV measurement, and CO gas sensing measurement, Physics Department, Manipur University for XRD and EDAX measurement, and CRF NITK, Karnataka for SEM measurement.

Funding

The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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Authors and Affiliations

  1. Department of Physics, D.M. University, Imphal, Manipur, India

    Th. Ratanjit Singh

  2. Department of Physics, D.M. College of Science, D.M. University, Imphal, Manipur, India

    L. Raghumani Singh

  3. D.M. College of Commerce, D.M. University, Imphal, Manipur, India

    A. Nabachandra Singh

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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Th. Ratanjit Singh, L. Raghumani Singh, and A. Nabachandra Singh. The first draft of the manuscript was written by Th. Ratanjit Singh and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to L. Raghumani Singh.

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Singh, T.R., Singh, L.R. & Singh, A.N. Effect of doping concentration of Cu2+ ion on ZnO thin film for detection of CO gas. J Mater Sci: Mater Electron 35, 1606 (2024). https://doi.org/10.1007/s10854-024-13338-1

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