Nanoporous Titania by Embossing with PMMA Nanopoles Made from Nanoporous Alumina Template
We produced highly uniform nanoporous thin films of the dense array of titania (TiO2) pores of 70~80 nm in diameter with nanoimprinting method. Titania in HCl and 2-propanol solution was coated on an indium tin oxide (ITO) surface and embossed with an array of PMMA nanopoles which was produced using a nanoporous alumina (Al2O3) template. Two-step anodization was introduced to produce highly uniform and dense nanopores on the aluminum surface. The polymethyl methacrylate (PMMA) was poured onto and infiltrated into the nanoporous alumina surface which was heated at 150 oC. The alumina nanopores and aluminum plate were removed by wet-etching leaving an array of PMMA nanopoles. These highly uniform nanostructured titania films will be very useful for photovoltaic and photocatalytic applications where nanostructuring of surface with controlled dimensions are essential.
Hyungsun Kim, Junichi Hojo and Soo Wohn Lee
H. J. Her et al., "Nanoporous Titania by Embossing with PMMA Nanopoles Made from Nanoporous Alumina Template", Materials Science Forum, Vols. 544-545, pp. 1017-1020, 2007