Further Understanding of the Adsorption Mechanism of N719 Sensitizer on Anatase TiO2 Films for DSSC Applications Using Vibrational Spectroscopy and Confocal Raman Imaging
In: Langmuir, Jg. 26 (2010), Heft 12, S. 9575-9583
academicJournal
- print, 59 ref
Zugriff:
Vibrational spectroscopic studies of N719 dye-adsorbed TiO, 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 ofbidentate-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.
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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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Autor/in / Beteiligte Person: | KEE EUN, LEE ; GOMEZ, Mario A ; ELOUATIK, Samir ; DEMOPOULOS, George P |
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Zeitschrift: | Langmuir, Jg. 26 (2010), Heft 12, S. 9575-9583 |
Veröffentlichung: | Washington, DC: American Chemical Society, 2010 |
Medientyp: | academicJournal |
Umfang: | print, 59 ref |
ISSN: | 0743-7463 (print) |
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