%0 Journal Article %J Journal of Physical Chemistry C %D 2011 %T Influence of Steam Treatment on Dye-Titania Complex Formation and Photoelectric Conversion Property of Dye-Doped Titania Gel %A Nishikiori, H. %A Uesugi, Y. %A Takami, S. %A Setiawan, R. %A Fujii, T. %A Qian, Wei %A El-Sayed, Mostafa A %X 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. %B Journal of Physical Chemistry C %V 115 %P 2880-2887 %8 Feb %@ 1932-7447 %G eng %M WOS:000287065700034 %R 10.1021/jp109958z