Architecture, optical absorption, and photocurrent response of TiO2-SrTiO3 and TiO2-CeO2 nanostructured composites

Chun-Hsien Chen; Jay Shieh; Jing-Jong Shyue

doi:10.1117/12.2026761

9 August 2013 Architecture, optical absorption, and photocurrent response of TiO₂-SrTiO₃ and TiO₂-CeO₂ nanostructured composites

Chun-Hsien Chen, Jay Shieh, Jing-Jong Shyue

Author Affiliations +

Proceedings Volume 8793, Fourth International Conference on Smart Materials and Nanotechnology in Engineering; 87931E (2013) https://doi.org/10.1117/12.2026761
Event: Fourth International Conference on Smart Materials and Nanotechnology in Engineering, 2013, Gold Coast, Australia

Abstract

This study investigates the microstructure, optical absorption and photoelectric properties of nanostructured composites of TiO₂ nanotube arrays and SrTiO₃ or CeO₂ nanoparticles. The composites were fabricated by anodization and hydrothermal methods and their UV-visible and ultraviolet photoelectron spectra (UV-Vis and UPS) were measured to determine the band structures of the TiO₂-SrTiO₃ and TiO₂-CeO₂ heterojunctions. The heterojunctions are designed to promote the separation of photo-induced electron and hole (e-/h+) pairs when the nanostructured composites are adopted in photocatalytic or photoelectrode applications. Approximately 1.0 and 0.8 eV shifts in conduction band position were determined for the TiO₂-SrTiO₃ and TiO₂-CeO₂ heterojunctions, respectively. The photocurrent densities of the TiO₂- SrTiO₃ and TiO₂-CeO₂ composites were about 20 to 40% larger than that of the TiO₂ nanotube arrays under identical irradiation conditions. The size of the SrTiO₃ and CeO₂ nanoparticles, which could be controlled by the hydrothermal temperature and time, and the concentration of oxygen vacancies within the TiO₂ nanotubes were identified to be the key factors governing the photocurrent densities of the nanostructured composites.

Citation Download Citation

Chun-Hsien Chen, Jay Shieh, and Jing-Jong Shyue "Architecture, optical absorption, and photocurrent response of TiO₂-SrTiO₃ and TiO₂-CeO₂ nanostructured composites", Proc. SPIE 8793, Fourth International Conference on Smart Materials and Nanotechnology in Engineering, 87931E (9 August 2013); https://doi.org/10.1117/12.2026761

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KEYWORDS

Titanium dioxide

Composites

Nanostructuring

Heterojunctions

Absorption

Nanoparticles

Ultraviolet radiation

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