Abstract
We dispersed nanoparticles of Prussian blue (PB) in water using surface modification of the PB nanoparticles. Using spin-coating method, a thin film is easily fabricated with water dispersible ink of PB nanoparticles. The PB film thickness was estimated as 40–430 nm. The PB nanoparticle film on an indium tin oxide glass substrate showed a stable electrochromic response: the color changed repeatedly between blue and colorless without any post-treatment.