4.5 Article

Contact potential barriers and characterization of Ag-doped composite TiO2 nanotubes

期刊

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
卷 75, 期 4, 页码 505-511

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2013.12.011

关键词

A. Nanostructures; C. Ab initio calculations; D. Microstructure; D. Surface properties; D. Transport properties

资金

  1. National Natural Science Foundation of China [50971043, 51171046]
  2. National Innovation Experiment Program for University Students of China [091038628]
  3. Natural Science Foundation of Fujian Province [2009J01239, 2010J01278]
  4. Scientific Research Foundation for the Returned Overseas Chinese Scholars, Chinese Ministry of Education [LXKQ0805]
  5. Fujian Industrial Technology Development, the Development and Reform Commission of Fujian Province
  6. Department of Education of Fujian Province [JA08164, JK2011039]

向作者/读者索取更多资源

Ag-doping TiO2 composite nanotubes (Ag-TNTs) were synthesized by alkaline fusion followed by hydrothermal treatment. The microstructure and morphology of the materials were characterized by XRD, TEM, XPS, SPS (surface photovoltage spectroscopy), FISPS (electric field-induced surface photovoltage spectroscopy) and Raman spectroscopy. First-principles calculations based on density-functional theory (DFT) showed the formation of several impurity levels near the top of the valence band in the band gap (E-g) of rutile TiO2 due to Ag doping. A double junction is proposed, involving a Schottky junction and p-n junction (denoted as Ag-p-n junction) occurring between the Ag particles and the nanotube surface, as well as forming inside TiO2 nanotubes, respectively. The strongly built-in electric field of the junctions promotes the separation of photo-holes and photoelectrons, enhancing the photocatalytic efficiency. XRD results indicated that the composite Ag-TNTs exist as a mixture of anatase and rutile phases. XPS results showed that Ti4+ is the primary state of Ti. Raman spectral analysis of Ag-TNTs revealed the presence of a new peak at 271 cm(-1). The red-shift of the absorption light wavelength of Ag-TNTs was 0.16 eV (20 nm) due to a considerable narrowing of E-g by the existing impurity levels. (C) 2013 Elsevier Ltd. All rights reserved.

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