ELECTRODEPOSITION OF NICKEL OXYHYDROXIDE FILMS THROUGH POLYMER MASKS

Nickel oxyhydroxide films were electrodeposited through gelatin masks, whose thicknesses may control the optical transmittances of the depos ited electrochromic films. The difference of transmittance, Delta T-54 0, between bleaching and coloration states at wavelength of 540 nm had a linear relationship with the gelatin mask thickness. Delta T-540 in creased if nickel oxyhydroxide was prepared in agitated electrolyte. T he electrodeposited films, prepared with gelatin masks, may have highe r stability. These results showed the feasibility of fabricating an el ectrochromic device with a controlled image whose contrast and brightn ess are adjustable with potential or current.