Influence of Steam Treatment on Dye-Titania Complex Formation and Photoelectric Conversion Property of Dye-Doped Titania Gel

TitleInfluence of Steam Treatment on Dye-Titania Complex Formation and Photoelectric Conversion Property of Dye-Doped Titania Gel
Publication TypeJournal Article
Year of Publication2011
AuthorsNishikiori, H, Uesugi, Y, Takami, S, Setiawan, R, Fujii, T, Qian, W, EL-Sayed, MA
JournalJournal of Physical Chemistry C
Volume115
Pagination2880-2887
Date PublishedFeb
ISBN Number1932-7447
Accession NumberWOS:000287065700034
Abstract

Xanthene dye molecules form a chelate complex with the titanium species on the titania surface in dye-titania systems. The complex formation causes a fast electron injection into the titania conduction band. In this study, simple spectroscopic and photocurrent measurements of the xanthene dye-doped titania gels prepared by the sol-gel method were conducted in order to clarify the influence of a steam treatment on the dye-titania interaction and electron transfer. The photocurrent quantum efficiency of the fluorescein-doped electrode was remarkably increased by the steam treatment compared to that of the untreated electrode consisting of an amorphous titania gel. The photocurrent action spectrum was red-shifted, and the short circuit photocurrent and open circuit voltage values increased with the steam treatment time. The steam treatment promoted the dye-titania complex formation, a negative shift in the conduction band potential of the titania, and the electron injection from the dye to the titania.

DOI10.1021/jp109958z