All chemicals used in this paper were analytical grade without further purification. The synthesis of FTO was based on a modified method according to the previous report [27]. 4.513 g SnCl2H2O and 0.3 ml 40% HF were dissolved in 200 mL deionized water. A solution of 8 mL acetylacetone in 30 mL methanol was slowly added to the above mixed solution for 1 h with rapid stirring. 2 h later, aqueous ammonia solution was dropped into the mixed solutions until the PH reached 9.5 to get gel formation. The resulting gel product was filtered and washed several times with deionized water till removal of the entire Cl which could be checked by 0.1 M AgNO3 solution before being transferred to the oven for further drying at 50 C. Dried material was ground homogeneously with a given mass of PEG 10000 and deionized water at a ratio of m:m (PEG):m (H2O) = 1:1:1 in a ball grinding mill for 7 h and nanopowder of FTO were obtained by calcinating in furnace for 2 h at 600 C. After cooling down, a paste was achieved by grinding FTO nanopowder with PVDF and N-Methylpyrrolidi- none at a mass ratio of m (FTO):m (PVDF):m (N-Methylpyrroli- dinone) = 7:1:14. The FTO nanoparticulate film was prepared by doctor blading of a thin layer FTO nanoparticle paste on the FTO substrate and sintered at 450 C for 30 minutes