Synthesis of nickel and cobalt oxide nanoparticles by pulsed underwater spark discharges

License
Published under license by AIP Publishing

Embargo End Date
2022-02-10

Type
Article

Authors
Merciris, Thomas
Valensi, Flavien
Hamdan, Ahmad

KAUST Grant Number
OSR-2020-CPF-1975.37

Online Publication Date
2021-02-10

Print Publication Date
2021-02-14

Date
2021-02-10

Abstract
Electrical discharges in liquids are considered an efficient and ecological technique of nanoparticle synthesis via controlled erosion of electrodes. Herein, we use spark discharges between Co–Co, Ni–Ni, Co–Ni, or Ni–Co electrodes immersed in distilled water to synthesize Co and/or Ni nanoparticles, as well as their oxides. When mixed electrodes are used (Co–Ni or Ni–Co), both Co and Ni nanoparticles are produced, and the major species is dictated by the nature of the anode pin. The characteristics of nanoparticles synthesized under varying conditions of pulse width (100 and 500 ns) and voltage amplitude (5 and 20 kV) are analyzed by transmission electron microscopy. Within the investigated discharge conditions, it is not possible to produce Co–Ni nanoalloys; however, core–shell nanoparticles are observed among the Ni and Co nanoparticles. Finally, the direct optical bandgaps of the nanomaterials are determined using UV-visible absorption spectroscopy.

Citation
Merciris, T., Valensi, F., & Hamdan, A. (2021). Synthesis of nickel and cobalt oxide nanoparticles by pulsed underwater spark discharges. Journal of Applied Physics, 129(6), 063303. doi:10.1063/5.0040171

Acknowledgements
This publication is based on work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-2020-CPF-1975.37. The authors thank the Fonds de Recherche du Québec–Nature et Technologie (FRQ-NT) and the Canada Foundation for Innovation (CFI) for funding the research infrastructure.

Publisher
AIP Publishing

Journal
Journal of Applied Physics

DOI
10.1063/5.0040171

Additional Links
https://aip.scitation.org/doi/10.1063/5.0040171

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