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Synthesis of Nitrogen-Doped Titanium Oxide Nanostructures Via a Surfactant-Free Hydrothermal Route

Published online by Cambridge University Press:  03 March 2011

Chang Houn Rhee ,
Jae Sung Lee  and
Soo Hyun Chung
Chang Houn Rhee
Affiliation:
Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea
Jae Sung Lee
Affiliation:
Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea
Soo Hyun Chung
Affiliation:
Korea Institute of Energy Research, Daejon 305-343, Republic of Korea
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Abstract

Nitrogen-doped titanium oxides nanostructures were synthesized by a new method proposed here from titanium oxysulfate precursor in a NH4OH solution under hydrothermal conditions without any extra templates as structure driving agents. The material synthesized with NH4OH was an ammonium titanate and showed curled nanosheets, nanofibers or nanorods morphologies depending on the molar ratio of NH4OH to titanium precursor and the hydrothermal temperature. The nanofibrous titanates had a high surface area over 500 m2 g−1 and a pore volume of 0.72 cm3 g−1. The calcination of as-synthesized material at 673 K produced a titanium oxynitride TiO2−xNx with anatase phase, which absorbed visible light. Ion exchange of ammonium ion of the titanate with sodium Na2Ti3O7−xNx enhanced the thermal stability of the titanate phase.

Keywords

HydrothermalNanofiber

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Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 11 , November 2005 , pp. 3011 - 3020
Copyright
Copyright © Materials Research Society 2005

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