[20a-P02-1~25] 6.3 Oxide electronics

[20a-P02-14] Nano flower-like WO₃ film deposited on FTO substrates and its photocatalytic properties

〇Ryota Uchida¹, Kosei Ito¹, Ibuki Koizumi¹, Kei Noda¹ (1.Keio Univ.)

Keywords:

photocatalyst,tungsten trioxide

WO₃, one of visible-light-responsive photocatalysts, was deposited directly on FTO substrates by a hydrothermal method in which the amount of oxalic acid and solution pH were adjusted. The WO₃ films have a unique nanoflower-like structure consisting mainly of hexagonal phase WO3 and exhibit typical physical properties of WO₃, such as a flat band potential of 0.26 V (vs. Ag/AgCl) and an electron density at the order of 10¹⁹ cm^-3. The strong photo-oxidation ability of WO₃ was confirmed through photoluminescence measurements using terephthalic acid as a trapping reagent for hydroxyl radicals.