不同工艺对PANI/PAA复合薄膜的电致变色性能影响

Influence of Synthetic Method on the Electrochromic Properties of PANI/PAA Composite Films

采用直接聚合法与逐层镀膜法分别成功制备了聚苯胺(PANI)/聚丙烯酸(PAA)复合薄膜,通过SEM、FTIR考察了两种工艺制备的薄膜的形貌和微结构,并测定了两种复合薄膜的循环伏安性能(CV)、电流响应特性(CA)及电致变色性能。结果表明,SEM与FTIR证实了两种方法制备的PANI/PAA复合薄膜仅在材料结构上有所不同;直接聚合法制备的PANI/PAA复合薄膜(PANI/PAA-DP)表面具有较大颗粒,两对明显的氧化还原峰,氧化态和还原态的响应时间分别为120 ms和226 ms,在600～700 nm波长处的透过率调制幅度为10%;逐层镀膜法制备的PANI/PAA复合薄膜(PANI/PAA-LP)具有多孔的网络结构,3对氧化还原峰,氧化还原反应更明显,电致变色性能更优异,其氧化态和还原态的响应时间分别为45 ms和67 ms,在600～700 nm波长处的透过率调制幅度可达40%。

The preparation of PANI/PAA composite films was carried out respectively by the direct polymerization method and by the layer by layer method. The surface structure and the composition of the composite films were characterized by means of scanning electron microscope （SEM） and fourier transform infrared spectroscopy （FTIR）;the cyclic vohammetry （CV）, the current response characterization （CA） and the electrochromic characterization were also measurated. The SEM and FTIR results show that there exists difference between the PANI/PAA composite films synthesized by the two methods only in terms of material structure;the PANI/PAA composite film synthesized through the direct polymerization method（PANI/PAA-DP） had a larger particle size and two obvious oxidation and reduction peaks ,the response time for oxidation and reduction were respectively 120 ms and 226 ms,and the transmittance modulation of the PANI/PAA composite films reached 10% at 600 - 700 nm;the PANI/PAA composite film synthesized through the layer by layer method（PANI/PAA-LP） had a porous network structure, three obvious oxidation and reduction peaks, stable electrochemical property, and improved eleetrochromic performance, the response time for oxidation and reduction were respectively 45 ms and 67 ms, and the transmittance modulation of the PANI/PAA composite filmsreached 40% at 600 - 700 nm.