Design, Manufacturing and Optimization of Ferroelectric Polymer Based Nanocomposite Films Using Langmuir-Blodgett Deposition

利用 Langmuir-Blodgett 沉积设计、制造和优化基于铁电聚合物的纳米复合薄膜

• 批准号: 0613060
• 负责人: Jiangyu Li
• 金额: --
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-04-12 至 2007-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0613060&HistoricalAwards=false
• 关键词: Design; Manufacturing; Optimization; Ferroelectric; Polymer

Nanostructured ferroelectrics are envisioned to possess novel and superior functional properties, yet the apparent existence of a size limit under which perovskites lose ferroelectricity severely limits the development of ferroelectric nanostructures. To overcome the difficulty, this project seeks to develop novel ferroelectric polymer based nanocomposite films using Langmuir-Blodgett (LB) deposition. The multilayer composite films will be built up by alternating at nanoscale the ferroelectric polymer films with other dielectric or ferroelectric layers made by various methods including standard solvent-deposition and nanoparticle dispersion techniques. The in-plane nanostructures will be constructed based on the formation of positive and negative nanomesa templates in LB films, with nanoparticles screen printed onto the substrate between the nanomesas or in the nanoholes. As such, ferroelectric nanocomposite films with one-, two- and three-dimensional heterogeneity will be fabricated. The fabrication will be tightly coupled with our modeling effort, where the microstructure evolution in ferroelectric nanocomposites will be simulated by energy-minimization approach and phase field theory, and their macroscopic properties will be analyzed by micromechanics models. The modeling of structure-property relationship will lead to an optimization scheme for a series of functional properties, including electrostriction and piezoelectric effect, pyroelectric coefficients, and dielectric tunability, which will be applied to guide the processing and fabrication of nanostructured ferroelectric devices.The knowledge derived from this research will enable the design and optimization of ferroelectric polymer based nanocomposite films possessing novel and unique functional properties, with direct impact on the manufacturing of nanostructured ferroelectric devices such as microsensors and microactuators, infrared detectors and microwave devices. The project will provide the opportunity to two graduate students to get involved in the interdisciplinary research dealing with the modeling, fabrication, and characterization of nanostructured ferroelectric polymer films. It will also draw undergraduates into science and engineering via the unique interaction between design, manufacturing, and characterization of ferroelectric nanocomposites through the Undergraduate Creative Activities & Research Experiences program (UCARE) at University of Nebraska-Lincoln. Results from this research will be incroporated in the content of an active materials course developed by the PI, which currently addreses only bulk ferroelectric behavior. Interactive, web-based tutorials and database will also be devoped to ensure broad dissemination of our scientific and technological finding.

纳米结构铁电材料被认为具有新颖和优异的功能特性，然而，钙钛矿失去铁电性的尺寸限制的存在严重限制了铁电纳米结构的发展。为了克服这一困难，本项目试图利用Langmuir-Blodgett(LB)沉积技术来开发新型的铁电聚合物基纳米复合薄膜。多层复合薄膜是将铁电聚合物薄膜与其他介电或铁电层在纳米尺度上交替，通过各种方法，包括标准溶剂沉积和纳米粒子分散技术制备而成的。平面内纳米结构将基于在LB膜中形成正负纳米颗粒模板，纳米颗粒屏幕印刷在纳米颗粒之间或纳米孔内的衬底上。因此，将制备具有一维、二维和三维异质的铁电纳米复合薄膜。制备将与我们的建模工作紧密地结合在一起，其中铁电纳米复合材料的微结构演化将采用能量最小化方法和相场理论进行模拟，其宏观性质将通过细观力学模型进行分析。结构-性能关系的建模将导致一系列功能特性的优化方案，包括电致伸缩和压电效应、热释电系数和介电可调谐，并将用于指导纳米结构铁电器件的加工和制备。本研究获得的知识将使具有新颖和独特功能特性的铁电聚合物基纳米复合薄膜的设计和优化成为可能，直接影响到微传感器和微执行器、红外探测器和微波器件等纳米结构铁电器件的制造。该项目将为两名研究生提供参与有关纳米结构铁电聚合物薄膜的建模、制造和表征的跨学科研究的机会。它还将通过设计、制造和表征铁电纳米复合材料之间的独特互动，通过内布拉斯加-林肯大学的本科生创新活动和研究体验项目(UCARE)吸引本科生进入科学和工程领域。这项研究的结果将被纳入由PI开发的一门活性材料课程的内容中，该课程目前仅涉及块状铁电行为。还将开发基于网络的交互式教程和数据库，以确保广泛传播我们的科学和技术成果。