Fe doped TiO2 nanofibers on the surface of graphene sheets for photovoltaics applications

Nasrin Farhangi; Yaocihuatl Medina-Gonzalez; Paul A. Charpentier

doi:10.1117/12.905671

8 September 2011 Fe doped TiO₂ nanofibers on the surface of graphene sheets for photovoltaics applications

Nasrin Farhangi, Yaocihuatl Medina-Gonzalez, Paul A. Charpentier

Proceedings Volume 8007, Photonics North 2011; 800721 (2011) https://doi.org/10.1117/12.905671
Event: Photonics North 2011, 2011, Ottawa, Canada

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.

Citation Download Citation

Nasrin Farhangi, Yaocihuatl Medina-Gonzalez, and Paul A. Charpentier "Fe doped TiO₂ nanofibers on the surface of graphene sheets for photovoltaics applications", Proc. SPIE 8007, Photonics North 2011, 800721 (8 September 2011); https://doi.org/10.1117/12.905671

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