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Gas sensing study of hydrothermal reflux synthesized NiO/graphene foam electrode for CO sensing

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Abstract

Nickel oxide nanosheets have been successfully synthesized on the graphene foam (GF) using hydrothermal reflux process for their application as carbon monoxide (CO) gas sensor. X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, energy dispersive spectroscopy, and gas sorption analysis were used to characterize the structure and morphology of the samples. The morphology (SEM), crystal structure (XRD and Raman), and elemental composition (EDS) analysis of NiO/GF composite confirmed the cubic crystal structure of NiO and elemental composition (i.e., Ni, O, and C) of NiO/GF composite. The results reveal that the incorporation of graphene into NiO nanosheets not only improved the surface area of NiO/GF composite, but also enhanced the performance of the composite on CO sensing by improving its conductivity. These results indicate that NiO/GF has potential as electrode material for CO gas sensor.

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Acknowledgements

This work is based on the research supported by the South African Research Chairs Initiative of the Department of Science and Technology and National Research Foundation of South Africa (Grant No. 97994). A. A. Khaleed acknowledges financial support from University of Pretoria and the NRF through SARChI chair in Carbon Technology and Materials.

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Authors and Affiliations

  1. Department of Physics, Institute of Applied Materials, SARCHI Chair in Carbon Technology and Materials, University of Pretoria, Pretoria, 0028, South Africa

    A. A. Khaleed, A. Bello, J. K. Dangbegnon, M. J. Madito, F. U. Ugbo, F. Barzegar, D. Y. Momodu & N. Manyala

  2. DST/CSIR National Centre for Nano Structured Materials, Council for Scientific and Industrial Research, P.O. Box 395, Pretoria, 0001, South Africa

    A. A. Akande, B. P. Dhonge & B. W. Mwakikunga

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  1. A. A. Khaleed
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  2. A. Bello
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  3. J. K. Dangbegnon
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  4. M. J. Madito
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  5. F. U. Ugbo
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  9. D. Y. Momodu
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  10. B. W. Mwakikunga
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Correspondence to B. W. Mwakikunga or N. Manyala.

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Khaleed, A.A., Bello, A., Dangbegnon, J.K. et al. Gas sensing study of hydrothermal reflux synthesized NiO/graphene foam electrode for CO sensing. J Mater Sci 52, 2035–2044 (2017). https://doi.org/10.1007/s10853-016-0491-6

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  • DOI: https://doi.org/10.1007/s10853-016-0491-6

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