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Issue 4, 2016
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Complex doping chemistry owing to Mn incorporation in nanocrystalline anatase TiO2 powders

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Abstract

Mn-doped TiO2 powders with a wide range of nominal doping levels were fabricated using a one-step hydrothermal method followed by 400 °C annealing. Anatase powders with a uniform size distribution below 10 nm were obtained. The maximum solubility of Mn in the TiO2 lattice was around 30%, beyond which the Mn3O4 compound appeared as a secondary phase. The optical absorption edges for Mn-doped anatase TiO2 were red-shifted effectively through increasing Mn content. Alloying chemistry and associated elemental valences were elaborated through combining X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS), and theoretical simulation in the framework of density functional theory (DFT). The results showed that the Mn species exhibited mixed valence states of 3+ and 4+ in anatase TiO2, with the latter being the key to remarkable photocatalytic performance.

Graphical abstract: Complex doping chemistry owing to Mn incorporation in nanocrystalline anatase TiO2 powders

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Article information


Submitted
06 Sep 2015
Accepted
17 Dec 2015
First published
17 Dec 2015

Phys. Chem. Chem. Phys., 2016,18, 2818-2829
Article type
Paper
Author version available

Complex doping chemistry owing to Mn incorporation in nanocrystalline anatase TiO2 powders

M. Guo, Y. Gao and G. . Shao, Phys. Chem. Chem. Phys., 2016, 18, 2818
DOI: 10.1039/C5CP05318H

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