A simple chemical method for deposition of electrochromic Prussian blue thin films

Abstract This paper is about a recently developed new chemical method for deposition of Prussian blue thin films. The films are easily prepared by successive immersion of the substrates into an acidic aqueous solution of Fe 2 (SO 4 ) 3 and K 4 [Fe(CN) 6 ]. It is calculated of the results from AFM analysis that the growth in the film thickness by one immersion cycle corresponds to an average increase of 6 nm. The characterization of the films with X-ray diffraction, SEM–EDS analysis and FTIR spectroscopy shows that the deposited material is amorphous hydrated Fe 4 [Fe(CN) 6 ] 3 . The electrochromic properties are characterized by cyclic voltammetry and VIS spectrophotometry. The PB thin films exhibit stability and excellent reversibility, which make these films favorable for electrochromic devices.