Figure 2

Schematic diagram of TiO ₂ pattern, images taken with optical microscopy and FE-SEM, and solid ¹⁹ F-NMR spectra. (a) Dimension of a TiO₂ pattern: the width (w), the distance (d), and the height (h) are 500, 500, and 2.5 μm, respectively. (b) The optical microscopic image of the TNP patterns on the FTO glass. (c) The FE-SEM image of the cross section of the patterned TNP layer of 2.5 μm thick. (d) The high-resolution FE-SEM image of the highly packed TNPs. The solid ¹⁹ F-NMR spectra of (e) an empty rotor and (f) a TNP layer after being treated with a fluorous solvent.