The effect of modified polyaniline on electrochromism

• Main Authors: Pao- Chuan Su, 蘇寶川
• Other Authors: Shi-Shiun Cheng
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/43145138356448092471

碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系 === 97 === To proceed adding with different amount of surfactant(Brij56) in the aniline monomer/H2SO4 solution, by electrochemical polymerization to synthesis polymer film in this study. Due to the amount of surfactant in acidic solution, it was found that the morphology and structure of PANI film is quite different, the optimal amount of surfactant is 2 wt %. All electrochemical studies were performed with a three-electrode system. The PANI film were deposited on the ITO glass by electrodeposition in the acid solution . we adopt cyclic voltammetry method to test the colouring and bleaching transition and cycle life of PANI film. The UV-vis spectroscopy (region from 300 nm to 800 nm) was carried out on the process of colouring and bleaching; the morphology of PANI film was observed by SEM, it was found that the difference of morphology between adding and without adding surfactant, it was also the key to find out the optimal conditions for the preparation of PANI film. In order to obtain a better colouring and bleaching film on the optical property, and an optimal route for electron transition on the PANI film by passing current. This work has been focused on the effect of the surfactant added in the acidic solution. There are three directions in this study: Firstly, to maintain the same amount of surfactant in the acid solution, and adopt different electrodeposition temperature (0 0C,10 0C, room temperature, and 50 0C) of ANI. A smooth PANI film would be formed at the lower temperature (0 0C and 10 0C). Secondly, to maintain the same ratio of ANI monomer/ H2SO4 solution, the same amount of surfactant, and H2SO4 solution was replaced to various acid (such as HNO3 and HCl), electrodeposited at R.T.; there is a better reversibility on the coluring and bleaching transition of PANI film in the H2SO4 solution. Finally, to change the concentration of H2SO4 solution (1 M，2 M，3 M，and 4 M), under the same electrodeposited condition, the thickness of PANI film increased as the concentration of H2SO4 solution rose. In this work, by adding with 2 wt % surfactant (Brij56) in the 1 M H2SO4 deposition solution, not only modified the morphology of PANI film but also improved the electrochemical, optical properties, and its cycle life.