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Journal of Materials Science: Materials in Electronics
Published in: Journal of Materials Science: Materials in Electronics 23/2020

16-10-2020

Improving charge separation, photocurrent and photocatalytic activities of Dy-doped TiO2 by surface modification with salicylic acid

Authors: Chaima Ouled Amor, Kais Elghniji, Elimame Elaloui

Published in: Journal of Materials Science: Materials in Electronics | Issue 23/2020

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Abstract

Salicylic acid-modified Dy-TiO2 (Dy-TiO2/SA), novel visible light-sensitive material was synthesized via a sol–gel followed by impregnation method. Salicylic acid (SA) molecules are mixed with the TiO2 and Dy-TiO2 samples in hexane which promotes their direct adsorption. SA-modified TiO2 particles (TiO2/SA and Dy-TiO2/SA) were finally obtained after drying at 120 °C. FTIR spectroscopy shows the formation of a fairly stable complex between Ti4+ surface ions and salicylic acid. In Dy-TiO2/SA complex, a ligand-to-metal charge transfer (LMCT) is active giving light absorption in the visible region (500–600 nm) indicating a bandgap of ~ 2.24 eV, lower than unmodified TiO2 samples. Electron paramagnetic resonance (EPR) and photoluminescence analyses demonstrate that LMCT process stabilizes the defect states within TiO2 bandgap, suppressing the electron–hole recombination process. The charge separation of SA-modified TiO2 complexes was evaluated through the photocurrent and the photocatalytic performances of Dy-TiO2/SA under visible light irradiation.
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Metadata
Title
Improving charge separation, photocurrent and photocatalytic activities of Dy-doped TiO2 by surface modification with salicylic acid
Authors
Chaima Ouled Amor
Kais Elghniji
Elimame Elaloui
Publication date
16-10-2020
Publisher
Springer US
Published in
Journal of Materials Science: Materials in Electronics / Issue 23/2020
Print ISSN: 0957-4522
Electronic ISSN: 1573-482X
DOI
https://doi.org/10.1007/s10854-020-04606-x

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