纳米纤维素/聚3,4-乙撑二氧噻吩复合薄膜的制备及电致变色性能

以棉浆粕为原料,采用硫酸溶胀结合超声波处理的方法制备了纳米纤维素(NC).在纳米纤维素的水分散液中加入3,4-乙撑二氧噻吩单体,以过硫酸铵为氧化剂,采用原位化学氧化法制得了纳米纤维素/聚3,4-乙撑二氧噻吩(NC/PEDOT)纳米复合物.对NC和NC/PEDOT复合物进行扫描电镜、透射电镜和红外光谱分析.将纳米复合物的水分散液滴涂在氧化铟锡(ITO)玻璃表面形成复合薄膜,考察不同纳米纤维素含量对NC/PEDOT复合薄膜电致变色性能的影响.结果表明,NC呈棒状,平均直径为20 nm,长度为100~300nm;NC/PEDOT复合物中PEDOT均匀包覆在NC表面形成核壳结构,平均直径为30 nm;复合薄膜中当NC含量为60%时,其电致变色性能最好,具有最高的对比度(24.4%),最短的响应时间(1 s),最高的着色效率(51.8 cm~2/C).

Preparation and Electrochromic Properties of Nano Cellulose/Poly(3,4-ethylenedioxythiophene) Composite Films

Nano biomaterials based on renewable resources have been of growing interest due to the recent advances in the field of nano technological applications.Nano cellulose(NC) was extracted by swelling cotton pulp, following with the ultrasonic treatment.The composites of poly(3,4-ethylenedioxythiophene)(PEDOT) with NC inclusions at different loadings were prepared using in situ polymerization with ammonium peroxydisulfate(APS) as oxidant in nanocellulose aqueous suspension.NC and NC/PEDOT composites were characterized.The thin composite films were obtained by drop-coating the composites aqueous suspension to the surface of ITO conducting glass.The results showed that the original NC was rod-like, with average diameter of 20 nm and length range from 100 nm to 300 nm.The NC/PEDOT composites were core-shell structure with average diameter of about 30 nm and PEDOT was uniformly coated on the surface of NC.The electrochromic properties of NC/PEDOT composite films with different NC contents were studied by electrochemical test and spectrophotometery.The NC/PEDOT composite film containing 60% NC showed the highest contrast ratio of 24.4%, the shortest response time of 1 s, and the highest coloration efficiency of 51.8 cm2/C.