Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 177, Issue 1, Pages 19-26Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mseb.2011.09.024
Keywords
Titanium oxide; Nanotubes; Nanoparticles; Nanorods; Hydrothermal synthesis; Dye sensitized solar cells
Funding
- Government of Aragon and La Caixa [GA-LC-041/2008]
- Spanish MICINN [EUI2008-00152, ENE2008-04373]
- Spanish National Research Council (CSIC)
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Mono-dimensional titanium oxide nanostructures (multi-walled nanotubes and nanorods) were synthesized by the hydrothermal method and applied to the construction of dye sensitized solar cells (DSCs). First, nanotubes (TiNTs) and nanotubes loaded with titanium oxide nanoparticles (TiNT/NPs) were synthesized with specific surface areas of 253 m(2)/g and 304 m(2)/g, respectively. After that, thermal treatment of the nanotubes at 500 degrees C resulted in their transformation into the corresponding anatase nanorods (TiNT-Delta and TiNT/NPs-Delta samples). X-ray diffraction and Raman spectroscopy data indicated that titanium oxide in the pristine TINT and TINT/NP samples was converted into anatase phase TiO2 during the heating. Additionally, specific surface areas and water adsorption capacities decreased after the heat treatment due to the sample agglomeration and the collapse of the inner nanotube channels. DSCs were fabricated with the nanotube TiNT and TINT/NP samples and with the anatase nanorod TiNT-Delta and TiNT/NPs-Delta samples as well. The highest power conversion efficiency of eta = 3.12% was obtained for the TINT sample, despite its lower specific surface compared with the corresponding nanoparticle-loaded sample (TINT/NP). (C) 2011 Elsevier B.V. All rights reserved.
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