TY - JOUR
T1 - Synthesis of nickel and cobalt oxide nanoparticles by pulsed underwater spark discharges
AU - Merciris, Thomas
AU - Valensi, Flavien
AU - Hamdan, Ahmad
N1 - KAUST Repository Item: Exported on 2021-11-21
Acknowledged KAUST grant number(s): OSR-2020-CPF-1975.37
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.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
PY - 2021/2/10
Y1 - 2021/2/10
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/667334
UR - https://aip.scitation.org/doi/10.1063/5.0040171
U2 - 10.1063/5.0040171
DO - 10.1063/5.0040171
M3 - Article
SN - 0021-8979
VL - 129
SP - 063303
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 6
ER -