2024-03-29T11:32:02Z
https://soar-ir.repo.nii.ac.jp/oai
oai:soar-ir.repo.nii.ac.jp:00018003
2022-12-14T04:12:28Z
1221:1222
Influences of Acid on Molecular Forms of Fluorescein and Photoinduced Electron Transfer in Fluorescein-Dispersing Sol-Gel Titania Films
Nishikiori, Hiromasa
Setiawan, Rudi Agus
Miyashita, Kyohei
Teshima, Katsuya
Fujii, Tsuneo
Fluorescein-dispersing titania gel films were prepared by the acid-catalyzed sol-gel reaction using a titanium alkoxide solution containing fluorescein. The molecular forms of fluorescein in the films, depending on its acid-base equilibria, and the complex formation and photoinduced electron transfer process between the dye and titania surface were investigated by fluorescence and photoelectric measurements. The titanium species were coordinated to the carboxylate and phenolate-like groups of the fluorescein species. The quantum efficiencies of the fluorescence quenching and photoelectric conversion were higher upon excitation of the dianion species interacting with the titania, i.e. the dye-titania complex. This result indicated that the dianion form was the most favorable for formation of the dye-titania complex exhibiting the highest electron transfer efficiency. Using nitric acid as the catalyst, the titania surface bonded to the fluorescein instead of the adsorbed nitrate ion during the steam treatment. The dye-titania complex formation played an important role in the electron injection from the dye to the titania conduction band.
Article
PHOTOCHEMISTRY AND PHOTOBIOLOGY. 90(4):747-759 (2014)
journal article
WILEY-BLACKWELL
2014-07-02
application/pdf
PHOTOCHEMISTRY AND PHOTOBIOLOGY
4
90
747
759
0031-8655
AA00773103
https://soar-ir.repo.nii.ac.jp/record/18003/files/Influences_Acid_Molecular_Forms_Fluorescein.pdf
eng
24502447
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?CMD=search&DB=pubmed&term=24502447
10.1111/php.12254
https://doi.org/10.1111/php.12254
Copyright © 2015 The American Society of Photobiology<br/>This is the peer reviewed version of the following article: PHOTOCHEMISTRY AND PHOTOBIOLOGY. 90(4):747-759 (2014), which has been published in final form at https://doi.org/10.1111/php.12254 . This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.