Layer-by-layer synthesis of nano Prussian blue electrochromic thin film modified electrodes

Abstract

A novel simple non-electrical fully controlled method has been developed for synthesis of modified electrodes by Prussian blue thin film on indium tin oxide substrates. The method comprises a tiny spot of silver as a sacrificed anode applied on one corner of the substrate by using layer-by-layer method for deposition nano Prussian blue thin film layers of electrodes (LBL/Ag), from a solution of equal concentrations of ferric chloride and potassium ferricyanide. The morphology of Prussian blue nanoparticles has been investigated by scanning electron microscopy and atomic force microscopy. The Prussian blue thin film thickness has been calculated. The Prussian blue film exhibits linear increase in the UV-vis light absorbance with the number of deposited layers, indicating that well organized lamellar systems are involved, which is consistent with the results based on the cyclic voltammetry measurements. These results show excellent electrochemical and reversible stable thin films, favorable for various applications such as electrochromic devices.