High-aspect ratio titania three-dimensional (TiO<sub>2</sub>) nanostructures: fabrication and applications

In this paper, the fabrication of high aspect ratio 3-dimensional titania (TiO₂) nanostructures based on costeffectively hydrothermal synthesis method is presented. A novel patterning method to overcome the tradeoff between tall trunks (nanorods) and large spacing is addressed. Polydimethylsiloxane (PDMS) was adopted to restrain the growth of the trunks (nanorods) of nanoforests to well control the morphology and surface area of TiO₂ nanoforests.