用于柔性和图案化电致变色器件的二维聚苯胺的喷墨打印研究

Inkjet printing of 2D polyaniline for fabricating flexible and patterned electrochromic devices

基于有机共轭聚合物的电致变色器件(ECD)在数字和彩色显示器中具有广阔的应用前景.然而,制备兼具优异电致变色性能、柔韧性和定制化图案的ECD仍然是一个挑战.本文报道了利用喷墨打印技术制备二维层状聚苯胺(PANI)基柔性图案化ECD的方法.层状PANI均匀分散在甲酸中,能够实现高精度、稳定的喷墨打印.同时,层状PANI的纳米级厚度、适当的掺杂比例,以及无添加剂的墨水成分,使得打印后的PANI电极和器件保持较高的电致变色性能和电化学特性.喷墨打印所得电极不仅表现出优异的光学对比度(76%,750 nm波长)、良好的着色效率(259.1 cm^(2)C^(-1))、较短的着色/褪色时间(1.8/2.4 s),而且具有赝电容特性与机械柔韧性.此外,本文所开发的二维层状PANI墨水可以定制化设计并打印成各种图案,并以此制备电化学控制的可寻址电致变色显示器.这种二维层状PANI电致变色材料可进一步用于柔性和图案化ECD,在新型光电显示领域具有较好的应用前景.

Conjugated organic polymer(COP)-based electrochromic devices(ECDs)exhibit promising applications in digital and color displays.However,fabricating COP-based ECDs integrated with excellent electrochromic performance,customized patterns,and flexibility remains challenging.In this study,we report inkjet-printed,flexible,and patterned ECDs based on two-dimensional(2 D)polyaniline(PANI)sheets,which are evenly dispersed in formic acid(FA)enabling high-precision,stable inkjet printing.The pristine lamellar structure of PANI sheets,which combine nanoscale thickness and an appropriate doping ratio,and the additive-free ink composition endow the printed PANI electrodes and ECDs with high performance.The fabricated PANI electrode exhibits a high optical contrast(76%at a wavelength of 750 nm),a good coloration efficiency(CE)of 259.1 cm^(2) C^(-1),and a short coloration/bleaching time(1.8/2.4 s),simultaneously integrated with pseudocapacitance and mechanical flexibility.Moreover,the 2 D lamellar PANI ink developed in this study can be printed into various designed patterns,particularly for electrochemically controlled,addressable electrochromic displays.This work highlights 2 D lamellar PANI as a promising electrochromic material for flexible and patterned ECDs.