There are many practical difficulties in direct adsorption of polymers onto nanocrystalline inorganic oxide surface such as Al 2O 3 and TiO 2 mainly due to the insolubility of polymers in solvents or polymer agglomeration during adsorption process. As an alternative approach to the direct polymer adsorption, we propose surface-bound polymerization of pre-adsorbed monomers. 6-(3-Thienyl)hexanoic acid (THA) was used as a monomer for poly[3-(5- carboxypentyl)thiophene-2,5-diyl] (PTHA). PTHA-coated nanocrystalline TiO 2/FTO glass electrodes were prepared by immersing THA-adsorbed electrodes in FeCl 3 oxidant solution. Characterization by ultraviolet/visible/infrared spectroscopy and thermal analysis showed that the monolayer of regiorandom-structured PTHA was successfully formed from intermolecular bonding between neighbored THA surface-bound to TiO 2. The anchoring functional groups (-COOH) of the surface-crawling PTHA were completely utilized for strong bonding to the surface of TiO 2.
- Nanocrystalline TiO
- Surface-bound polymerization