High carrier density and capacitance in TiO2 Nanotube arrays induced by electrochemical doping
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Altres documents de l'autoria: Fabregat-Santiago, Francisco; Barea, Eva M; Bisquert, Juan; Mor, Gopal K.; Shankar, Karthik; Grimes, Craig A.
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Mostra el registre complet de l'elementcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/2507
comunitat-uji-handle3:10234/6973
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http://dx.doi.org/10.1021/ja710899q |
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Títol
High carrier density and capacitance in TiO2 Nanotube arrays induced by electrochemical dopingAutoria
Data de publicació
2008Editor
American Chemical SocietyISSN
0002-7863Cita bibliogràfica
Journal of the American Chemical Society, 130, 34, p. 11312–11316Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://pubs.acs.org/doi/abs/10.1021/ja710899qVersió
info:eu-repo/semantics/publishedVersionParaules clau / Matèries
Resum
The paper describes the electronic charging and conducting properties of vertically oriented TiO2 nanotube arrays formed by anodization of Ti foil samples. The resulting films, composed of vertically oriented nanotubes ... [+]
The paper describes the electronic charging and conducting properties of vertically oriented TiO2 nanotube arrays formed by anodization of Ti foil samples. The resulting films, composed of vertically oriented nanotubes approximately 10 μm long, wall thickness 22 nm, and pore diameter 56 nm, are analyzed using impedance spectroscopy and cyclic voltammetry. Depending on the electrochemical conditions two rather different electronic behaviors are observed. Nanotube array samples in basic medium show behavior analogous to that of nanoparticulate TiO2 films used in dye-sensitized solar cells: a chemical capacitance and electronic conductivity that increase exponentially with bias potential indicating a displacement of the Fermi level. Nanotube array samples in acidic medium, or samples in a basic medium submitted to a strong negative bias, exhibit a large increase in capacitance and conductivity indicating Fermi level pinning. The contrasting behaviors are ascribed to proton intercalation of the TiO2. Our results suggest a route for controlling the electronic properties of the ordered metal-oxide nanostructures for their use in applications including supercapacitors, dye-sensitized solar cells, and gas sensing. [-]
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Copyright © 2008 American Chemical Society
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