基于液晶剥离石墨构筑柔性透明导电薄膜及其光伏器件

项目名称： 基于液晶剥离石墨构筑柔性透明导电薄膜及其光伏器件

项目编号： No.51273057

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 杨应奎

作者单位： 湖北大学

项目金额： 80万元

中文摘要： 针对当前柔性透明导电薄膜面临电导率、透光率和稳定性偏低等问题，本项目拟结合液晶剥离石墨和功能化柔性衬底探求一条解决途径。利用液晶升温至清亮点形成低粘度液体，借助微波、超声"外场"作用，结合液晶与石墨之间的"内场"共轭作用，内外合力促进分子插层剥离石墨得到石墨烯；而降温至粘度增加的液晶态时，石墨烯片之间因受粘滞阻力和分子取向的空间限制而稳定分散。通过溶液法加工，分别以咪唑分子接枝PET基片、咪唑盐聚离子液体/PET电纺纤维为柔性衬底，构筑界面结合力强、抗挠曲性好的石墨烯透明导电薄膜，并以其为电极构建光伏电池。本项目将系统研究液晶分子结构、石墨剥离条件与石墨烯形态之间的相互关系；揭示纺丝条件、溶液参数与纳米纤维结构之间的调控规律；调节石墨烯溶液参数以调控薄膜电阻和透光率；阐明光伏电池的能量转换机制。本项目的实施将为制备高质量石墨烯、优化构筑透明导电薄膜和高性能光伏器件提供新的方法学和理论依据。

中文关键词： 石墨烯；液相剥离；纳米复合材料；电化学储能；新能源材料

英文摘要： Flexible transparent conductors are an extremely important component of modern electronic technology, and are generally fabricated from an inorganic conductive layer and an organic flexible substrate. They, however, have not been commercially used in the flexible electrics due to low transparence, electrical conductivity and interface stability in thin layers. The present project attempts to find an alternative way to solve this problem using a combined strategy. We try to prepare highly conductive materials based on graphene sheets. In the present work, graphene will be obtained by liquid-phase exfoliation of graphite in the isotropic liquid state of thermotropic liquid crystals upon heating up to over clear point, at which liquid crystals change into a clear, transparent liquid with low viscosity. At this point, graphite is easily exfoliated to give stable dispersions of mono- and few-layer graphene sheets due to the fact that the inter-graphene layers in graphite are intercalated by liquid molecules under microwave treatment followed by ultrasonication. However, liquid crystals will be recovered at low temperature to give an increased viscosity. The newly exfoliated graphene sheets are well stabilized and separated by the viscous resistance and steric hindrance arising from the local molecular alignment of li

英文关键词： Graphene；Liquid-phase exfoliation；Nanocomposites；Electrochemical energy storage；New energy materials