National Science Library, Chinese Academy of Sciences
  登录 机构网站 ENGLISH
您当前的位置是: 首页-> 详细浏览
服务链接:
作者 : 宁静 ;  
答辩时间 : 2016-05-01
论文类型 : 博士
学位授予单位 : 中国科学院研究生院
论文总页码 : 101
中文关键词 : 石墨烯;;柔性;;透明导电薄膜;;化学气相沉积;;还原氧化石墨烯
英文关键词 : graphene;;flexible;;transparent conductive film;;chemical vapour deposition (CVD);;reduced graphene oxide
中文摘要 : 目前,随着电子器件的迅速发展,柔性可弯折器件由于具有便携、可穿戴、不易折损等优点,已经成为电子器件重要的发展方向。其中,柔性光电器件,如柔性太阳能电池、柔性液晶显示器、柔性触摸屏、柔性有机发光二极管等,也都受到了研究者以及产业界的极大关注。柔性光电器件中的核心组成部分之一是柔性透明导电薄膜。然而,目前商用的透明电极仍然是以氧化铟锡(ITO)材料为主。这类材料由于本身是金属氧化物,具有本征脆性,无法满足柔性器件的需求;同时所含的重要组分铟元素在地球上储量较少,价格较高,不利于降低工业生产成本。因此,寻找廉价、可大量制备并且性能优异的ITO替代材料仍然是此领域研究的重要方向。石墨烯由于其独特的二维结构和优异的物理化学性质,成为柔性透明导电薄膜材料的有力竞争者。本文主要针对石墨烯基透明导电薄膜材料的制备与性能优化进行研究,特别是对石墨烯基薄膜的廉价、可连续化大量制备方法与技术进行了探索。 本论文第一部分围绕化学气相沉积(CVD)方法生长石墨烯进行了系统的研究。先针对以氢气为主的生长条件对石墨烯生长质量和形貌的影响进行了系统研究。通过采用极端氢气流量的条件实验研究,深入认识了氢气在石墨烯生长过程中促进与刻蚀的双重作用,并通过这种生长刻蚀现象制备得到了新型的锯齿状和绒毛状石墨烯边缘结构。之后,论文针对大面积柔性石墨烯薄膜的制备中重要而又困难的转移步骤,发展了用柔性透明的纤维网作为石墨烯生长基底的思路,从而无转移地得到自支撑柔性透明石墨烯网薄膜。通过静电纺丝的方法,制备了含有金属以及二氧化硅的自支撑超薄纳米纤维网,并以此为基底生长石墨烯,首次无转移地直接得到了自支撑柔性透明的石墨烯网薄膜(透光率80%,方块电阻5-10 KΩ/sq),并组装了电致变色器件。 论文第二部分针对石墨烯基透明导电薄膜的低成本、连续化制备方法进行了研究。采用更廉价的还原氧化石墨烯方法,重点解决了该方法在连续化制备中还原步骤的安全性和效率问题。本论文先对氧化石墨烯原料进行了优化,通过考察氧化石墨烯的氧化程度和官能团种类,选择了破坏程度较低的氧化石墨烯作为原料。论文该部分重点发展了一种亚锡离子/乙醇的高效还原体系以及相应的连续化、快速还原工艺,该方法充分发挥了乙醇溶剂的优势,一方面便于在多种薄膜表面直接涂布,另一方面其易挥发性也使得加热蒸发带来的迅速水解形成了高pH、高浓缩还原剂离子以及高离子迁移速率的有利环境。因此,此方法能够快速(5分钟以内)实现氧化石墨烯薄膜的还原,且还原后得到的还原氧化石墨烯薄膜性能相对优异(透光率83~91%,方块电阻0.8~3.6 KΩ/sq)。此外,表征还发现金属离子在还原后同时形成的高价离子对石墨烯还具有一定掺杂作用。由于这种方法迅速且安全性高,可成功将其应用于石墨烯薄膜的卷对卷连续化制备,得到大面积的柔性石墨烯透明导电膜,并用其制备了柔性触摸屏器件以及柔性透明导线。 论文第三部分针对石墨烯基透明导电薄膜的制备研究进行了扩展。为了进一步提高其综合性能,使其能够更好地与应用对接,需要发展简便的石墨烯基复合透明导电薄膜和图案化石墨烯薄膜的制备方法。论文本部分在金属离子还原方法的基础上,巧妙地利用了还原产物形成的连续裂纹图案作为模板,通过金属沉积直接得到石墨烯/金属网格复合透明导电膜,此方法没有引入新杂质,也避免了在制备模板过程中对石墨烯薄膜的破坏,是一种简便地得到石墨烯复合薄膜的方法,得到的复合薄膜性能接近金属网格薄膜的性能而同时具有连续的平面导电性;另一方面发展了无刻蚀的图案化石墨烯薄膜的制备方法,解决了常见的模板结合刻蚀图案化方法中成本高且不利于连续化制备的问题。在上一部分的还原体系(亚锡离子/乙醇体系)基础上,进一步制备得到还原性“油墨”,将其直接印在氧化石墨烯膜上能够实现快速、灵活的图案化还原。本部分还将此方法结合丝网印刷方法成功实现了大面积、任意图案化还原氧化石墨烯薄膜的制备,有望将其用于石墨烯基微电子器件的制备中。
英文摘要 : With rapid development of electronic devices, flexible or bendable devices have become an important trend due to their advantages of portable, wearable and non-fragile nature,. Among them, flexible photoelectronic devices, such as flexible solar cells, flexible organic liquid crystal displays, flexible touch panels, flexible light-emitting diodes, all drew great attention of researchers and manufacturers. An important component of flexible photoelectronic device is the flexible transparent conductive films, which are still mainly fabricated with indium tin oxide(ITO) materials. However, as a kind of metal oxide, ITO suffers from its brittle nature, thus it can not meet the need of flexible applications. At the same time, as a rare element, indium is included in this material as a key component, whose price is quite high, thus not beneficial for lowering the production cost. Consequently, to search for a low-cost mass-productive and high-performance transparent conductive substitute material for ITO is still a vital issue in this research area. At present, some other transparent conductive materials, including conductive polymer (PEDOT:PSS), carbon nanotubes (CNTs), graphene, metal nanostructures (metal nanowires, metal thin films and metal nanogrids) and their hybrid materials are also under studying. Among them, graphene is one of the most competitive candidates for flexible transparent conductive films with its unique two-dimentional structure and outstanding chemical and physical properties. This thesis is mostly focused on the preparation of graphene-based flexible transparent conductive films, especially their low-cost and continuously mass productions. Firstly, chemical vapour deposition (CVD) method is applied to grow graphene on copper foil, and the influence of growth condition to the quality and appearance of graphene is systematically studied. Then several different substrates are used for the growth of graphene, and CVD growth conditions are comprehensively studied. To replace the complex transfer step within, a flexible transparent mesh substrate is directly used as the CVD substrate. Through electrospinning technique, self-standing ultrathin nanofiber mesh containing metal and silica are prepared as the CVD substrate. And after graphene deposition, flexible graphene nanofiber mesh films with T of 80% and Rs of 5-10 KΩ sq-1are obtained, and successfully applied into electrochromic devices. Secondly, a much cheaper route for roll-to-roll preparation of large-area high-quality reduced graphene oxide (rGO) thin films is developed. First, the GO material is optimized by selecting low oxidized GO for film fabrication. Then, a Sn2+/ethanol reduction system and a fast coating-drying reduction technique are developed, which can complete the reduction of GO film under mild condition in less than 5 minutes. The optical and conductive performances (T ~ 91% and Rs ~ 3.6 KΩ sq-1) are relatively superior compared with other rGO based thin films. It’s also observed that the lower valent metal ions can be transformed to higher valent metal ions after reduction, which works as p-type dopant for rGO films, and can also be one of the reasons for the superior conductive performances. Because this is a very fast and safe method , it is then applied into the roll-to-roll preparation of rGO film, and large-area rGO flexible transparent conductive films are successfully obtained. And these films are further been fabricated into flexible resistive touch panel devices and flexible transparent wires. Thirdly, graphene-based hybrid film and patterned graphene film are prepared. On the basis of the above method (Sn2+/ethanol reduction system) for preparing rGO film, it’s observed that if the metal oxide product on the rGO film is not removed, continuous crackles on the film surface form naturally after a short-time mild heating. And this can work as a metal deposition template to prepare rGO/metal mesh hybrid films, which further improv

相关文献推荐:

专利制度和财税政策对企业研发选煤和产业发展的影响分析:一个基于自主体学位论文

作者:刘涛著等 答辩时间:2007-6-6  

专利制度和财税政策对企业研发选煤和产业发展的影响分析:一个基于自主体学位论文

作者:刘涛著等 培养单位:[科技政策与管理科学研究所]  答辩时间:2007-6-6  

面向自主创新能力建设的高技术产业知识产权战略研究学位论文

作者:宋河发著等 答辩时间:2007-6-16  

面向自主创新能力建设的高技术产业知识产权战略研究学位论文

作者:宋河发著等 培养单位:[科技政策与管理科学研究所]  答辩时间:2007-6-16  

自然资源与社会经济发展:经济发展不同阶段与主要资源消费研究学位论文

作者:刘燕鹏等 培养单位:[中国科学院生态环境研究中心]  答辩时间:1998  总页码:40  

基于自主开发和商用RSoft软件的光子晶体模拟研究和器件设计学位论文

作者:江斌等 培养单位:[半导体研究所]  答辩时间:2012  

基于双向星间链路的自主时间同步仿真分析学位论文

作者:方 琳等 培养单位:[国家授时中心]  答辩时间:2013-5  

初中生完美主义发展及其与自尊的关系学位论文

作者:王龙等 培养单位:[中国科学院研究生院]  答辩时间:2011-5-16  总页码:34  

基于自主开发和商用RSoft软件的光子晶体模拟研究和器件设计学位论文

作者:江斌等 培养单位:[中国科学院研究生院]  答辩时间:2012-6-2  

全球价值链背景下我国高新技术企业自主品牌发展研究学位论文

作者:黃贵蓮等 培养单位:[中国科学院科技政策与管理科学研究所]  答辩时间:2008  总页码:58  

问图书管理员更多图书管理员

学科咨询馆员
学科馆员

电话:
邮件:
问图书馆员

图标说明

在线获取原文 原文传递 详细信息 图书在架状态 图书馆际互借 问图书馆员

常见问题

图书馆开放时间 图书馆位置 借阅要求 您在使用中发现的任何错误,都可以向我们 【报告错误】,非常感谢!

作者信息:×