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Synthesis and characterization of nitrogen-doped titanium dioxide nanomaterials derived from nanotube sodium titanate precursor

Published online by Cambridge University Press:  21 August 2012

Baoli Tian ,
Yu Qian ,
Binbin Hu ,
Jiaruo Sun  and
Zuliang Du
Baoli Tian
Affiliation:
Key Laboratory of Ministry of Education for Special Functional Materials, Henan University, Kaifeng 475004, Henan, People’s Republic of China
Yu Qian
Affiliation:
Key Laboratory of Ministry of Education for Special Functional Materials, Henan University, Kaifeng 475004, Henan, People’s Republic of China
Binbin Hu
Affiliation:
Key Laboratory of Ministry of Education for Special Functional Materials, Henan University, Kaifeng 475004, Henan, People’s Republic of China
Jiaruo Sun
Affiliation:
Key Laboratory of Ministry of Education for Special Functional Materials, Henan University, Kaifeng 475004, Henan, People’s Republic of China
Zuliang Du*
Affiliation:
Key Laboratory of Ministry of Education for Special Functional Materials, Henan University, Kaifeng 475004, Henan, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Nitrogen-doped titanium dioxide (denoted as N-doped TiO2) nanomaterials were prepared through the ion exchange of sodium titanate nanotube (the precursor; denoted as STN) with aqueous NH4Cl and follow-up sintering at different temperatures in air. The morphology, structure, surface component, and optical properties of as-obtained N-doped TiO2 nanomaterials have been analyzed by transmission electron microscopy, x-ray diffraction, x-ray photoelectron spectroscopy, and ultraviolet–visible light diffuse reflectance spectrometry. The formation mechanism and the origin of the visible light absorption for N-doped TiO2 nanomaterials have been discussed. Moreover, the thermogravimetric analysis and differential thermal analysis of N-doped TiO2 nanomaterial calcined at 100 °C are conducted as an example to examine the thermal stability of as-synthesized N-doped TiO2. It has been found that, as the calcination temperature rises, the initial nanotubular morphology of STN is transformed to the final nanoscale granular one, accompanied by a phase transformation from orthorhombic crystalline system to anatase TiO2. The N content in N-doped TiO2 is 7.04%, 6.22%, 3.20%, 1.14%, 0.61%, and 0.40% (atomic percentage), depending on calcination temperature rising from 100 to 600 °C. Moreover, N-doped TiO2 samples experience three stages of weight losses, and that calcinated at 300 °C and above have strong visible light absorption, due to the formation of Ti–O–N bonds thereat.

Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 18 , 28 September 2012 , pp. 2408 - 2416
Copyright
Copyright © Materials Research Society 2012

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