NDLI: Characterization of the photoactivity of nanotube layers grown on Ti–35Nb and Ti–35Nb

Content Provider	Springer Nature Link
Author	Veríssimo, Nathalia Carolina Figueiredo, Raul Sebastião Oliveira, Haroldo Gregório Rodrigues, Christiane Arruda Caram, Rubens Bertazzoli, Rodnei
Copyright Year	2016
Abstract	TiO$_{2}$ nanotube arrays, grown on titanium metal by anodizing, have been widely used as a photoelectrode. Titanium alloys have also been anodized to obtain doped TiO$_{2}$ nanotubes or as oxide heterojunctions with enhanced photoactivity, in some cases with absorption extending over the region of visible light. In this paper, samples of Ti–35Nb and Ti–35Nb–4Sn (wt%) alloys were anodized in a dilute HF electrolyte to grow a self-ordered nanotube layer and were heat treated for crystallization of anatase phase of TiO$_{2}$. Characterization by X-ray diffraction and photoelectron spectroscopy revealed that the oxide layers were composed of anatase-TiO$_{2}$/Nb$_{2}$O$_{5}$ and anatase-TiO$_{2}$/Nb$_{2}$O$_{5}$/SnO$_{2}$ phases. TiO$_{2}$/Nb$_{2}$O$_{5}$ nanotubes showed a photoresponse compared with TiO$_{2}$ nanotube arrays, with photoactivity extending to the region of visible light as a consequence of a band gap energy lower than that of TiO$_{2}$. A band gap energy of 2.5 eV was calculated by fitting data from the diffuse reflectance spectroscopy (Tauc plot) using the Kubelka–Munk function.
Starting Page	9384
Ending Page	9393
Page Count	10
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	51
Issue Number	20
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2016-07-07
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Materials Science Characterization and Evaluation of Materials Polymer Sciences Continuum Mechanics and Mechanics of Materials Crystallography Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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