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Issue 3, 2018
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Photoelectrocatalytic effect of unbalanced RF magnetron sputtered TiO2 thin film on ITO-coated patterned SiO2 nanocone arrays

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Abstract

TiO2 has displayed potential for improved catalytic activity using a newly designed morphological system. Herein, a new catalytic system of SiO2/ITO/TiO2 nanocone array structures with unbalanced RF sputtering deposition was developed and demonstrated for photoelectrocatalytic activity. The array structures were fabricated using a soft nanolithography technique with a SiO2 sphere-patterned polydimethylsiloxane stamp. TiO2 films were coated on the ITO-coated SiO2 nanocones using unbalanced RF magnetron sputtering with various external magnetic fields applied by a solenoid. The nanostructures were examined using scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction crystallography, and X-ray photoelectron spectroscopy. The photocurrent response in water splitting was found to be increased by 400% for TiO2 films on nano-patterned arrays, compared with that on a flat surface. An additional increase in photocatalytic activity was achieved via TiO2 film deposition with an external magnetic field of 6 mT. This dramatic enhancement was attributed to the surface active sites created by the additional applied magnetic field and the increased surface area of the nanocone arrays.

Graphical abstract: Photoelectrocatalytic effect of unbalanced RF magnetron sputtered TiO2 thin film on ITO-coated patterned SiO2 nanocone arrays

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Publication details

The article was received on 21 Nov 2017, accepted on 12 Jan 2018 and first published on 12 Jan 2018


Article type: Paper
DOI: 10.1039/C7CY02371E
Citation: Catal. Sci. Technol., 2018,8, 898-906
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    Photoelectrocatalytic effect of unbalanced RF magnetron sputtered TiO2 thin film on ITO-coated patterned SiO2 nanocone arrays

    G. J. Choi, H. Jung, D. H. Kim, Y. Sohn and J. S. Gwag, Catal. Sci. Technol., 2018, 8, 898
    DOI: 10.1039/C7CY02371E

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