Mid-infrared absorption of trapped electrons in titanium(iv) oxide particles using a photoacoustic FTIR technique

Naoya Murakami; Tatsuki Shinoda

doi:10.1039/c8cp04885a

Mid-infrared absorption of trapped electrons in titanium(iv) oxide particles using a photoacoustic FTIR technique

Phys Chem Chem Phys. 2018 Oct 3;20(38):24519-24522. doi: 10.1039/c8cp04885a.

Authors

Naoya Murakami¹, Tatsuki Shinoda

Affiliation

¹ Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensuicho, Tobata, Kitakyushu 804-8550, Japan. murakami@life.kyutech.ac.jp.

PMID: 30226232
DOI: 10.1039/c8cp04885a

Abstract

Mid-infrared absorption of titanium(iv) oxide (TiO2) under ultraviolet (UV) irradiation was studied by Fourier transform infrared spectroscopy using a photoacoustic (PA) technique. UV irradiation induced an upward shift of the PA spectra, which is due to the trivalent titanium (Ti3+) species produced by electron accumulation. The PA spectra under UV irradiation mainly depend on the crystal structure, indicating that the energy levels of Ti3+ are largely determined by crystal structures.