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

Thomas Merciris, Flavien Valensi, Ahmad Hamdan

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


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.
Original languageEnglish (US)
Pages (from-to)063303
JournalJournal of Applied Physics
Issue number6
StatePublished - Feb 10 2021
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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