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

Chengsheng Ni, Darragh Carolan, Conor Rocks, Jianing Hui, Zeguo Fang, Dilli Babu Padmanaban, Jiupai Ni, Deti Xie, Paul Maguire, John T. S. Irvine, D Mariotti

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

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.
LanguageEnglish
JournalGreen Chemistry
Volumen/a
Early online date27 Mar 2018
DOIs
Publication statusE-pub ahead of print - 27 Mar 2018

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Ethanol
Semiconductor quantum dots
Nanoparticles
Anodic oxidation
Light absorption
Helium
Photoelectron spectroscopy
X ray spectroscopy
Cobalt
Complex Mixtures
Charge carriers
X ray diffraction analysis
Metal foil
Electrolytes
Thermogravimetric analysis
Suspensions
Photoluminescence
Diodes
Acetates
Salts

Keywords

  • plasma

Cite this

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

In: Green Chemistry, Vol. n/a, 27.03.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Microplasma-assisted electrochemical synthesis of Co3O4 nanoparticles in absolute ethanol for energy applications

AU - Ni, Chengsheng

AU - Carolan, Darragh

AU - Rocks, Conor

AU - Hui, Jianing

AU - Fang, Zeguo

AU - Padmanaban, Dilli Babu

AU - Ni, Jiupai

AU - Xie, Deti

AU - Maguire, Paul

AU - Irvine, John T. S.

AU - Mariotti, D

N1 - UIR Compliant - evidence uploaded to other files

PY - 2018/3/27

Y1 - 2018/3/27

N2 - 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.

AB - 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.

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