微纳米纤维表面分子铁电晶态材料的结构调控与性能研究

项目名称： 微纳米纤维表面分子铁电晶态材料的结构调控与性能研究

项目编号： No.51502208

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 刘瑞娜

作者单位： 武汉纺织大学

项目金额： 21万元

中文摘要： 针对分子内部结构与铁电性能关系不明确，晶体形态不利于在器件上应用的难题，本项目以结构可调性极强的手性氮氧自由基、β-二酮配体和金属离子构筑分子铁电晶体，从分子水平上阐明配体手性、功能取代基团、金属离子配位场环境、分子内及分子间作用力等结构因素与铁电性能之间的内在联系。并在聚偏氟乙烯、聚（偏氟-三氟乙烯）微纳米多孔纤维（包括多孔纤维膜和纳米孔结构的单根纤维）基底上可控制备分子铁电晶态薄膜，满足各种功能器件上的使用形态。通过纤维基底的方向性、多孔结构和形态的多样性进一步调控晶态薄膜的生长、形貌及内部偶极子的取向排列；研究薄膜组成、结构、形貌及厚度对铁电性能的影响；揭示分子铁电材料与基底材料间的相互影响机制；阐明分子铁电晶态薄膜的形成机理与组装规律。研究结果能够为分子铁电晶态材料的开发提供新思路；为分子铁电材料达到实际应用水平提供理论指导与实验例证。

中文关键词： 手性氮氧自由基；金属离子；多孔纤维；分子铁电晶体；晶态薄膜

英文摘要： There exist the problems that the relationship between the internal structure of molecules and ferroelectric properties is not clear, and the form of crystals can not be used in device well. In this research, molecular ferroelectric crystals will be constructed by using chiral nitronyl nitroxide, β-diketonate which both have strong structural controllability and metal ions. The relationship between chirality, functional substituents, ligand field environment of metal ions, intra/inter-molecular forces and ferroelectric properties can be clarified at the molecular level. The molecular ferroelectric crystalline thin films will also be obtained with controllable preparation on PVDF/P(VDF-TrFE) micro/nano porous fiber substrates (including the porous fiber films and the single fiber with nanoporous structures). The ferroelectric thin films can be used in kinds of functional devices. The growth, morphology of crystalline thin films and the orientation of internal dipoles can be regulated and controlled through the directivities, porous structures and diversities of fibers. The effect of component, structure, morphology and thickness of the films on ferroelectric properties will be studied. The interaction mechanism between molecular ferroelectric materials and substrates will be explained. The formation mechanism and assembling rule of the molecular ferroelectric crystalline thin films can also be clarified. The results can provide new ideas for developing of molecular ferroelectric crystalline materials, and theoretical guidance and experimental examples for achieving practical utilization level of the molecular ferroelectric materials.

英文关键词： Chiral Nitronyl Nitroxide;Metal Ions;Porous Fibers;Molecular Ferroelectric Crystals;Crystalline Thin Films