Defect complex formation in TiO2 nanoparticles by sub-band excitation

2021/10/20 by Neha Luhakhra, Luhakhra, Neha, Sanjiv Kumar Tiwari +1
Energy · Materials Science · #Catalytic Processes in Materials Science #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #TiO2 Photocatalysis and Solar Cells #Transition Metal Oxide Nanomaterials

paper · pdf · doi:10.48550/arxiv.2110.10399

openalex publication_date 2021/10/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Anatase TiO2 is an indirect band-gap material with large degree of sub-stoichiometry, selective excitation of its native defect reveals polychromatic emission in blue, green and red spectral regions due to self trapped excitons and singlet-singlet transition of defect states. Electron spin resonance measurement in dark shows presence of isolated Ti+3, deep lying, and surface lying VO at 1.986, 2.04 and 2.023 g values respectively, whereas , on exposure with visible light in situ ESR measurement reveals the formation of defect complex of Ti+3-VO and Ti+4-V+O.

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