Electrochemiluminescence Cell Fabrication Using TiO_2 Nanotube Produced by Anodic Oxidation

摘要

Electrochemiluminescence (ECL) cell using the electrode of TiO_2 nanotube (NT) and Ru(II) complex Ru(bpy)_3(PF_6)_2 as a luminacence substance was fabricated. TiO_2 NT were produced from the membrane of TiO_2 NT arrays fabricated by anodic oxidation of ～100 μm thick Ti-plate. TiO_2 NT arrays inject increasing number of electrons to the Ru(II) complex at the interface of TiO_2 NTs. It allows the increasing exergonic oxidation/reduction reaction of Ru(II) complex. The ECL cell emits ～600 nm light in orange color. The cell structure is composed of a glass/F-doped SnO_2(FTO)/TiO_2 NT/Ru(II) complex in propylene carbonate/FTO/glass. The ECL efficiency of the cell consisting of the layer of TiO_2 NT was ～255 cd/m~2 at a bias of 4 V. The use of TiO_2 NT increases ECL intensities by 5 times compared to the typical ECL cell without the use of TiO_2 NT.