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Proceedings Paper

Fe doped TiO2 nanofibers on the surface of graphene sheets for photovoltaics applications
Author(s): Nasrin Farhangi; Yaocihuatl Medina-Gonzalez; Paul A. Charpentier
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Paper Abstract

Highly ordered, visible light driven TiO2 nanowire arrays doped with Fe photocatalysts were grown on the surface of functionalized graphene sheets (FGSs) using a sol-gel method with titanium isopropoxide (TIP) monomer, acetic acid (HAc) as the polycondensation agent and iron chloride in the green solvent, supercritical carbon dioxide (scCO2). The morphology of the synthesized materials was studied by SEM and TEM, which showed uniform formation of Fe doped TiO2 nanofibers on the surface of graphene sheets, which acted as a template for nanowire growth through surface -COOH functionalities. Increasing Fe content in the nanowires did not change the morphology significantly. Optical properties of the synthesized composites were examined by UV spectroscopy which showed a significant reduction in band gap with increasing Fe content, i.e. 2.25 eV at 0.6% Fe. The enhancement of the optical properties of synthesized materials was confirmed by photocurrent measurement. The optimum sample containing 0.6% Fe doped TiO2 on the graphene sheets increased the power conversation efficiency by 6-fold in comparison to TiO2 alone.

Paper Details

Date Published: 8 September 2011
PDF: 8 pages
Proc. SPIE 8007, Photonics North 2011, 800721 (8 September 2011); doi: 10.1117/12.905671
Show Author Affiliations
Nasrin Farhangi, The Univ. of Western Ontario (Canada)
Yaocihuatl Medina-Gonzalez, The Univ. of Western Ontario (Canada)
Paul A. Charpentier, The Univ. of Western Ontario (Canada)

Published in SPIE Proceedings Vol. 8007:
Photonics North 2011
Raman Kashyap; Michel Têtu; Rafael N. Kleiman, Editor(s)

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