【作者】 李娟；

【导师】 严虎；

【作者基本信息】 郑州大学 ， 物理化学， 2016， 硕士

【摘要】 导电高分子使用方便、易加工、导电性可调、耐腐蚀等,近年来逐渐发展成为一门物理、化学和生物交叉的新兴学科的研究对象。其中,聚(3,4-乙烯二氧噻吩)/聚对苯乙烯磺酸(PEDOT/PSS)是一种集高导电性(掺杂之后)、高透光性、优良环境稳定性以及可溶液加工等优良性能于一体的导电高分子。利用其可溶液加工性制备的PEDOT/PSS透明导电薄膜有望取代氧化铟锡(ITO)应用于透明电极、触摸屏等领域,是近年来研究的一大热点。然而,目前研究最多、最成熟的薄膜制备方法—旋涂法,其无法大面积制备的缺点大大限制了PEDOT/PSS透明导电膜的应用。线棒涂布法是一种经验证可大面积均匀制备薄膜的方法,但是对于在高分子薄膜制备方面各种有可能的影响因素没有具体报道。因此,本论文有必要在这方面进行深入研究。在制备出大面积的导电透明薄膜基础上,又对薄膜进行处理,以期得到大面积的自支撑薄膜,然而,由于PEDOT/PSS自身的柔软性,致使制备的自支撑膜机械性能不足。埃洛石纳米管(HNTs)是一种具有特殊中空管状结构、力学强度好、无毒无害、储量丰富的天然矿石,且经本实验室前期工作验证,埃洛石纳米管和PEDOT/PSS可以完美混合,进行PEDOT/PSS-HNTs复合材料的研究。因此本论文选择加入HNTs,以期提高PEDOT/PSS透明导电薄膜的机械性能。本课题研究的内容主要分以下三部分:利用线棒涂布法制备大面积的透明导电薄膜;对有支撑薄膜进行脱离基板和干燥处理,尝试得到自支撑PEDOT/PSS超薄膜;在PEDOT/PSS分散液中加入埃洛石纳米管,制备自支撑的PEDOT/PSS-HNTs超薄膜并表征。首先,利用线棒涂布法,通过对线棒型号、涂布速度、所用表面活性剂浓度、乙二醇浓度、薄膜热处理温度等一系列因素的优化,在最佳制膜条件下,作者制备出了大面积的方块电阻为230Ωsq-1,550 nm处的透光率为84.5%的透明导电薄膜。其次,在前期制备的有支撑薄膜的基础上,对薄膜进行处理使其脱离基板,并干燥处理,尝试制备自支撑薄膜,对制备的自支撑薄膜进行了表征分析。研究发现,制备的薄膜方块电阻在173Ωsq-1左右,550 nm处的透光率在75%以上。但薄膜机械性能非常弱,保存、移动困难。最后,采取在PEDOT/PSS分散液中加入埃洛石纳米管,用来提高自支撑PEDOT/PSS薄膜的机械性能。研究发现,HNTs的加入确实能增加自支撑薄膜的机械性能,自支撑薄膜制备更容易,且保存、转移均比较方便。但相应的透光性能有所下降,在55%左右;方块电阻为213Ωsq-1左右,和没添加HNTs的薄膜相比,变化不大。更多还原

【Abstract】 Conducting polymers have gathered great attention because of its nice performance such as tunability of conductivity, flexibility, easy synthesis and low cost. Particularly, poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate)(PEDOT/PSS), has already been one of the most broadly researched conducting polymers because of its specialties of high conductivity, high transparency for visible region, fine stability and nice processing performance. PEDOT/PSS thin films are expected to be used in the fields of transparent electrode of touch screens and solar cells. Spin-coating is the most investigated method for preparation of the PEDOT/PSS thin films, however, some drawbacks have affected its use in the preparation of the thin films with large area. Bar-coating, a preparation method of films with large-area on flexible substrates, has revealed a considerably fine prospect of application. Therefore, a systematic investigation on coating condition is considerably necessary. Free-standing PEDOT/PSS thin films also have their high potential to applications. Halloysite nanotubes(HNTs) have a high aspect ratio and high mechanical strength, and also environment-friendy and resource-rich, expecting to improve mechanical properties of the free-standing PEDOT/PSS thin films.This paper consists of three parts. Firstly, PEDOT/PSS thin films with large area were prepared on PET substrates by bar-coating method through optimizing various parameters of coating condition. Secondly, free-standing PEDOT/PSS films were successfully prepared and characterized. Lastly, investigations were made to improve the mechanical properties of the free-standing PEDOT/PSS films by addition of the HNTs.更多还原