Further Understanding of the Adsorption Mechanism of N719 Sensitizer on Anatase TiO2 Films for DSSC Applications Using Vibrational Spectroscopy and Confocal Raman Imaging

Vibrational spectroscopic studies of N719 dye-adsorbed TiO2 films have been carried out by using SERRS, ATR-FTIR, and confocal Raman imaging. The high wavenumber region (3000−4000 cm−1) of dye adsorbed TiO2 is analyzed via Raman and IR spectroscopy to investigate the role of surface hydroxyl groups...

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Published in:Langmuir 2010-06, Vol.26 (12), p.9575-9583
Main Authors: Lee, Kee Eun, Gomez, Mario A, Elouatik, Samir, Demopoulos, George P
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Language:English
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Chemistry
Exact sciences and technology
General and physical chemistry
Interfaces: Adsorption, Reactions, Films, Forces
Surface physical chemistry
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Gomez, Mario A
Elouatik, Samir
Demopoulos, George P
description Vibrational spectroscopic studies of N719 dye-adsorbed TiO2 films have been carried out by using SERRS, ATR-FTIR, and confocal Raman imaging. The high wavenumber region (3000−4000 cm−1) of dye adsorbed TiO2 is analyzed via Raman and IR spectroscopy to investigate the role of surface hydroxyl groups in the anchoring mode. As a complementary technique, confocal Raman imaging is employed to study the distribution features of key dye groups (COO-, bipyridine, and CO) on the anatase surface. Sensitized TiO2 films made from two different nanocrystalline anatase powders are investigated: a commercial one (Dyesol) and our synthetic variety produced through aqueous synthesis. It is proposed the binding of the N719 dye to TiO2 to occur through two neighboring carboxylic acid/carboxylate groups via a combination of bidentate-bridging and H-bonding involving a donating group from the N719 (and/or Ti-OH) units and acceptor from the Ti-OH (and/or N719) groups. The Raman imaging distribution of COO− sym on TiO2 was used to show the covalent bonding, while the distribution of CO mode was applied to observe the electrostatically bonded groups.
doi_str_mv 10.1021/la100137u
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subjects Chemistry
Exact sciences and technology
General and physical chemistry
Interfaces: Adsorption, Reactions, Films, Forces
Surface physical chemistry
title Further Understanding of the Adsorption Mechanism of N719 Sensitizer on Anatase TiO2 Films for DSSC Applications Using Vibrational Spectroscopy and Confocal Raman Imaging
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