Schematic diagram of TiO2 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.
Cho et al. Nanoscale Research Letters 2013 8:491 doi:10.1186/1556-276X-8-491