Fabrication of nanostructured titanium dioxides by nanotemplates of block copolymers

We fabricated vertically aligned nanostructures of semiconductor TiO2 which can be utilized for various optoelectronic devices such as solar cells. We first prepared perpendicularly-ordered lamellar nanostructures of block copolymers on the substrate, followed by selective removal of microdomains to obtain block copolymer nanotemplates. With the sol-gel process, anatase TiO2 nanostructures were effectively produced over the whole substrate. Furthermore, we were able to adjust the size of TiO2 nanostructures by varying the molecular weight of copolymers.