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arXiv · 2110.10399

Defect complex formation in TiO2 nanoparticles by sub-band excitation

Neha Luhakhra·Sanjiv Kumar Tiwari
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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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Neha Luhakhra, Sanjiv Kumar Tiwari. 2021-10-20. Defect complex formation in TiO2 nanoparticles by sub-band excitation. https://arxiv.org/abs/2110.10399

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