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Micro-Patterning of Magnetron Sputtered Titanium Dioxide Coatings and Their Efficiency for Photocatalytic Applications
Open AccessArticle

Enhanced Photoelectrochemical Properties from Mo-Doped TiO2 Nanotube Arrays Film

Department of Materials Science, Fudan University, Shanghai 200433, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Coatings 2020, 10(1), 75; https://doi.org/10.3390/coatings10010075
Received: 30 December 2019 / Revised: 10 January 2020 / Accepted: 13 January 2020 / Published: 15 January 2020
(This article belongs to the Special Issue Photocatalytic Thin Films)
Mo-doped TiO2 nanotube arrays are prepared successfully by a combined method of direct current (DC) magnetron sputtering and anodic oxidation. The doping amount of Mo can be modified by changing the number of molybdenum blocks on the Ti target while a Ti–Mo alloy film is prepared by magnetron sputtering on a metal Ti substrate, following a Mo-doped TiO2 nanotube array grown by anodization. Morphology test shows that the doping of Mo could inhibit the phase transition and growth of crystal of TiO2. X-ray photoelectron spectroscopy (XPS) results show that Mo has successfully been embedded in the TiO2 crystal lattice and mainly exists in the valence states of Mo6+. Mo-doping samples show slightly increased visible light absorption as the red shift of TiO2 absorption edge with the band gap dropping from 3.24 to 3.16 eV with 0.5 at.% Mo doping. The enhanced photocurrent is demonstrated for a 0.5 at.% Mo-doped TiO2 electrode. Through photoelectric performance testing under UV-visible light irradiation, the nanotube array film with a Mo-doped content of 0.5% produced the maximum photocurrent density, which is about four times the undoped TiO2 nanotube array film, exhibiting a considerable photoelectric effect gain. The controllable Mo doping TiO2 nanotube array film prepared by this combining technique is expected as a promising material for efficient applications in photoelectric conversion.
Keywords: TiO2; Mo-doped; nanotube array; anodic oxidation; magnetron sputtering; photoelectrochemical properties TiO2; Mo-doped; nanotube array; anodic oxidation; magnetron sputtering; photoelectrochemical properties
MDPI and ACS Style

Xue, D.; Luo, J.; Li, Z.; Yin, Y.; Shen, J. Enhanced Photoelectrochemical Properties from Mo-Doped TiO2 Nanotube Arrays Film. Coatings 2020, 10, 75.

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