基于水滑石限域效应的铁电复合薄膜构筑及性能研究

In the demand of exploring new eco-friendly energy/data harvesting and storage resources, ferroelectrics, especially for ferroelectric films, have attracted great attention. Design of ferroelectric film with modified structure and oriented arrangement is significant to achieve reliable signal and energy conversion efficiency. In this project, we focus on the configuration manipulation and performance enhancement for ferroelectric molecules induced by layered double hydroxides (LDHs). The composite film exhibits excellent energy conversion (improved piezoelectric performance) and storage ability (promoted dielectric constant), as well as great potential in data memory device (prominent ferroelectric property). On the other hand, through the adjustment of host layer composition, charge density, morphology and confinement environment, we plan to research the mechanisms of the structrue-directed polarization switching ability and ferroelectric performances of LDHs-based ferroelectric composite films, and the confinement effect of LDHs will be deeply studied. The project may provide opportunities and inspirations for the manipulation on molecular orientation and domain configuration for ferroelectrics, which also exhibit great significances in basic theory study and analytical applications for layered nanomaterial and ferroelectrics.

铁电薄膜因能实现能量和信息的存储与转换而受到广泛关注。在铁电分子成膜过程实现微观形态调控，是优化铁电性能、构筑电子元器件的重要基础。本项目基于水滑石（LDHs）的层状结构和二维限域效应，以LDHs为结构模板诱导铁电分子偶极有序排列、构型优化，提高铁电客体自发极化程度，构筑复合薄膜材料并有效实现信息记载（铁电性能提升）、能量转换（压电性优异）及能量存储（介电性能好）。通过进一步调控LDHs层板组成、电荷密度、形貌及限域环境，研究LDHs及其限域效应对铁电分子微观状态的调控机制以及对宏观性能的关键影响。本项目将层状纳米材料作为结构优化基元应用于铁电领域，为新型铁电复合薄膜的设计和研究提供了新思路和新方法，对层状纳米材料及铁电分子的基础理论和应用研究具有重要意义。

本项目以构筑性能优异的LDHs基铁电复合材料为目标，研究LDHs二维限域效应对铁电客体分子的微观调控机制，设计不同结构、形貌的LDHs基铁电复合材料。项目从插层组装方法设计、LDHs基铁电复合材料构筑与调控、LDHs基复合材料的构效关系研究、复合材料在能量转换及存储中的应用四个方面展开，取得了如下成果：①采用多种插层组装方法，设计并构筑结构有序、形貌均匀的复合薄膜；②实现对客体分子的调控，揭示LDHs二维限域效应在影响客体铁电分子分散状态、形貌、构型以及取向中的关键作用；③优化LDHs基铁电复合材料铁电、压电、热电、介电等性能，构筑薄膜器件，探索其实际应用。