Layer-by-layer Assembly of Tungstophosphate and Alizarin Red Composite Film for Electrochromic Application

Abstract

A composite film based on Tungstophosphate and Alizarin Red (AR) was preparation on quartz and F-doped SnO2 substrates by the layer-by-layer selfassembly technique (LbL). The as-prepared film was investigated using UV-vis spectroscopy and electrochemical measurement. The electrochemical behavior was studies using cyclic voltammetry (CV) in HAc-NaAc buffer solution (pH = 4). The composite film exhibited high transmittance contrast of 29% and coloration efficiency of 66 cm2/C at 650 nm. Furthermore, the multilayer film shows adjustable color and undergoes transitions from red to dark purple-blue.