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• W2318884034 startingPage "24189" @default.
• W2318884034 abstract "Photoluminescence spectroscopy was employed to observe electron transport between TiO2 particles. Ultraviolet (UV) irradiation (3.88 eV) was shown to positively enhance the photovoltage of TiO2 particles at the powder surface, causing an enhancement of their photoluminescence (PL) at 530 nm. The charging of the TiO2 particles on the powder surface by UV irradiation partially discharges in the dark, where the displaced bulk negative charge diffuses back toward the TiO2 surface. This charge flow partially restores upward band bending, causing the PL intensity to decrease. The rate of the discharging process was used to estimate the electron migration mobility (∼10–10 m2 V–1 s–1 at 300 K) between TiO2 particles in the TiO2 matrix. Electron migration between TiO2 particles is temperature-dependent with an activation energy of 0.015 ± 0.008 eV. In addition, it was found that the adsorption of an immobile electron-donor molecule (NH3), attracts negative charge on the TiO2 surface which does not exhibit mobility..." @default.
• W2318884034 created "2016-06-24" @default.
• W2318884034 creator A5030878088 @default.
• W2318884034 creator A5061083189 @default.
• W2318884034 date "2013-11-08" @default.
• W2318884034 modified "2023-10-04" @default.
• W2318884034 title "Electron Hopping through TiO₂ Powder: A Study by Photoluminescence Spectroscopy" @default.
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• W2318884034 doi "https://doi.org/10.1021/jp407765r" @default.
• W2318884034 hasPublicationYear "2013" @default.
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