石墨烯-ITO复合电极对聚苯胺薄膜电致变色性质的影响  

Electrochromic Properties of Polyaniline Films on Graphene-ITO Composite Electrode

作　　者：吕晓静[1] 于朋飞[1] 欧阳密[1] 钱亮[1] 闫拴马 金晓强[1] 张诚[1] 

机构地区：[1]浙江工业大学化学工程学院,杭州310014

出　　处：《高等学校化学学报》2017年第4期694-700,共7页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:51673174;51573165);浙江省自然科学基金(批准号:LY15E030006);浙江工业大学校基金重点项目(批准号:1401101002408)资助~~

摘　　要：采用改进的Hummers法制备氧化石墨烯(GO),首先,石墨与浓硫酸、过硫酸钾和五氧化二磷反应制得强氧化产物,随后将其与浓硫酸、硝酸钠、高锰酸钾反应,经双氧水发泡、酸洗、超声等合成氧化石墨烯水溶液,再通过金属箔还原和基底转移过程制备GO-氧化铟锡(ITO)复合电极材料.通过金属箔还原和基底转移过程制备GO-氧化铟锡(ITO)复合电极材料.利用电化学聚合法在GO-ITO复合电极上制备聚苯胺(PANI)薄膜,并对其形貌结构、电化学及电致变色性质进行表征.结果表明,与ITO电极相比,采用GO-ITO复合电极制备的PANI的成膜性得到明显改善,复合电极具有更加均匀细致的颗粒表面,增大了聚合物与电解液之间的接触面积,为电致变色过程中平衡离子的注入/脱出提供了更多的通道,因而PANI薄膜在700nm处的光学对比度提高了约13%,响应速度缩短了约2.6 s,着色效率高达169.6 cm2/C.GO的引入保持了PANI良好的电化学稳定性.GO-ITO复合电极有效改善了聚合物的综合性能,对于聚合物电致变色材料及器件的开发具有潜在的应用前景.Graphene oxide（ GO） aqueous solution was synthesized by modified Hummers method. Graphites reacted with concentrated sulfuric acid,potassium persulfate and phosphorus pentoxide to get strong oxidized products,then reacted with concentrated sulfuric acid,sodium nitrate and potassium permanganate. GO solution was obtained through the foaming of hydrogen peroxide,pickling and ultrasonic. After the reduction of metal copper and substrate transformation process,GO-indium tin oxide（ ITO） composite electrode was prepared. Then,polyaniline（ PANI） film was prepared on the composite electrode by electropolymerization technique and further characterized. Compared to that on ITO electrode,PANI film on GO-ITO composite electrode showed a more homogeneous and uniform nanoparticle morphology and better film-forming character,providing larger interface area between the polymer and electrolyte and more transport channel for counterions. The result showed that PANI film exhibited higher optical contrast with increasing by 13% at 700 nm,faster switching speed with reducing by 2. 6 s,high coloration efficiency of 169. 6 cm2/C and still remained the original good electrochemical stability. In summary,GO-ITO composite electrode can effectively improve electrochromic performance,endowing the potential applications on electrochromic materials and devices.

关 键 词：电致变色 聚苯胺 石墨烯 复合电极 电化学聚合 

分 类 号：O631[理学—高分子化学] O646[理学—化学]