Supercritical Fluid Deposition of High-Density Nanoparticles of Photocatalytic TiO2 on Carbon Nanowalls

Nanoparticles of the anatase phase of TiO2 (2.7 +/- 0.7 nm) with a high density of 10(12) cm(-2) were supported on the entire surface of carbon nanowalls (CNWs) by employing metal organic chemical fluid deposition in supercritical carbon dioxide at a substrate temperature of 180 degrees C. For decomposing methylene blue under ultraviolet irradiation, a high photocatalytic decomposition rate of 6 mg/h was obtained for 1 mg of TiO2 supported on CNWs. (C) 2013 The Japan Society of Applied Physics