Preparation And Charactereation Water-soluble Conductive Polyaniline Complex Electrochromic Film

Electrochromism can be defined as the phenomenon of the electrochromic material to undergo color reversible change upon oxidation or reduction, which was ensued from changing the potential applied. The reversible changes of the performances of the transmission, reflection and color of the electrochromic materials can be showed in appearance. The electrochromic materials can be classified as anodically colored and cathodically colored materials by electrochemical reaction modes. Electrochromic (EC) materials are one of new functional materials, which have very good application future. It can be used widely in large-area display, light switch, unglaring viewfinder, deposited devices, building glass and smart windows. Early studies of EC materials were focused on inorganic and small-molecule organic EC materials, which suffered from processing, compatibility, and performance problems. More recently, electrochromics research has focused heavily on thin electrochromic polymer films. New advances in this area have led to the synthesis of these novel electrochromic polymers with extremely high contrast and coloration efficiency.In this paper, sulfonated poly(styrene-acrylic acid) (SPSA) as template , water-soluble, conducting polyaniline (PANI) was synthesized by ammonium persulfate. Then, the films were deposited on ITO/glass by spin-coating method. The influence of the components of SPSA on formation and stability of films was investigated. The performance of electrochemistry, responding time, optical transmittance and open circuit memory time were tested by cyclic voltammetry, constant voltage and UV-vis spectrometer.From the experiment, it is found that the prepared PANI/SPSA complex is very stable which can be stored for a very long time at temperature, and it does not easy to loses its dopant even treated by base or base solution. At low potential, IV Electrochromin device assembled with this film could be made to reflect green-primrose yellow- blue color even without solid electrolyte. Responding time and open circuit memory time of the film was 1s and 4h, separately. The thin films showed excellent electrochromic performance.