V. Yu. Osipov, D. Hao, K. Takai, T. Uchikoshi, H. Ogata, T. Ishigaki, “Titanium dioxide nanoparticles heavily doped with niobium: A light-induced electron paramagnetic resonance study”, Mendeleev Commun., 2023, Volume 33, Issue 3,Pages <nobr>349

This article is cited in 4 papers

Communications

Titanium dioxide nanoparticles heavily doped with niobium: A light-induced electron paramagnetic resonance study

V. Yu. Osipov^ab, D. Hao^cd, K. Takai^b, T. Uchikoshi^de, H. Ogata^bd, T. Ishigaki^bd

^a Ioffe Institute, St. Petersburg, Russian Federation
^b Department of Chemical Science and Technology, Hosei University, Tokyo, Japan
^c Ceramic Research Center, Saga University, Arita, Saga, Japan
^d Research Center for Micro-Nano Technology, Hosei University, Koganei, Tokyo, Japan
^e Research Center for Functional Materials, National Institute for Material Science, Tsukuba, Ibaraki, Japan

Abstract: Light-induced electron paramagnetic resonance (EPR) spectra of titanium dioxide nanoparticles heavily doped with niobium(v) are studied. At low temperatures, the EPR signal caused by interband illumination is associated with paramagnetic Ti³⁺ sites in anatase, which, as the temperature rises above 210 K, are discharged to the non-paramagnetic Ti⁴⁺ state due to the escape of trapped photoelectrons and their recombination with holes. The temperature dependence of the integral EPR signal has a non-Curie character, especially in the temperature range where the discharge of Ti³⁺ centers is already significant.

Keywords: titanium dioxide, niobium, photocatalysts, electron paramagnetic resonance, electron and hole traps, charge transfer.

Language: English

DOI: 10.1016/j.mencom.2023.04.017

	*Supplementary materials:*
		Supplementary_data_1.pdf	798.4 Kb