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Microplasma-assisted electrochemical synthesis of Co3O4 nanoparticles in absolute ethanol for energy applications

Ni, Chengsheng, Carolan, Darragh, Rocks, Conor, Hui, Jianing, Fang, Zeguo, Padmanaban, Dilli Babu, Ni, Jiupai, Xie, Deti, Maguire, Paul, Irvine, John T. S. and Mariotti, D (2018) Microplasma-assisted electrochemical synthesis of Co3O4 nanoparticles in absolute ethanol for energy applications. Green Chemistry, n/a . [Journal article]

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URL: http://dx.doi.org/10.1039/C8GC00200B

DOI: 10.1039/C8GC00200B


Plasma at the gas/liquid interface can promote a complex mixture of reactions in solution and microplasma-assisted direct-current anodic oxidation is an efficient and green process in synthesising nanoscale materials for various applications. In this study, we demonstrated the direct synthesis of crystalline Co3O4 quantum dots, ca. 2-5 nm in diameter, by the direct anodization of Co foil with charge balanced by the microplasma at the flowing-helium/pure-ethanol interface under ambient conditions. The anodic oxidation of cobalt in ethanol was analysed after characterising the solution using nuclear magnetic resonance (NMR), light absorption, and photoluminescence (PL) analyses, and the solid product using X-ray photoemission spectroscopy (XPS), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). In the microplasma process, at high applied voltage, ethanol was oxidised to acetate acting as the charge carrier and the size of Co3O4 quantum dots could be controlled by the limiting current. The quantum dots from this method are well dispersed in ethanol and a dense coating for light absorption and a rectified diode can be processed directly from the suspension. These results reveal that microplasma-assisted anodisation in ethanol is an efficient and green route capable of manufacturing quantum dots at low temperature and avoiding the use of extraneous ionic salts in the electrolyte.

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:39999
Deposited By: Professor Davide Mariotti
Deposited On:23 Apr 2018 13:11
Last Modified:27 Mar 2019 23:23

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