Achieving High Dielectric Constant Relaxor Ferroelectric Nanocrystals via a Hybridization-Induced Nanodomain Approach

通过杂交诱导纳米域方法实现高介电常数弛豫铁电纳米晶体

• 批准号: 1709420
• 负责人: Zhiqun Lin
• 金额: $ 45万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-07-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1709420&HistoricalAwards=false
• 关键词: Achieving; Dielectric; Constant; Relaxor; Ferroelectric

Nontechnical Abstract:Nanostructured ferroelectric materials show great potential for future micro- and nano-electronic applications, including wearable medical sensors for human monitoring, non-volatile ferroelectric memory, piezoelectric/electrostrictive actuation, second harmonic generation imaging, energy harvesting and storage, electrocaloric cooling, and liquid crystal displays. Unfortunately, as the dimensions of ferroelectric materials decrease to a few tens of nanometers, their high dielectric property eventually disappears as a result of destabilization of the ferroelectric phase. Therefore, it is highly desirable to develop novel, high dielectric constant ferroelectric nanocrystals with stable ferroelectric phase and nanosized domains. The understanding of polymer defect-induced ferroelectric nanodomains within inorganic nanocrystals paves the way to create many other intriguing ferroelectric nanocrystals. Meanwhile, the research project is integrated with nanoscience education through close interactions among graduate students, undergraduate students, high school science teachers, and high school students in a multilevel learning experience inspired by the excitement of discovery at both Georgia Tech and Case Western Reserve University. The goals are to stimulate the interest of high school students in the area of science, technology, engineering, and mathematics (STEM), and better prepare undergraduate students for the STEM-related professions. To enhance the public awareness of nanoscience and nanotechnology, research findings are widely disseminated to multiple constituencies through publications in scientific journals, presentations at national conferences and workshops.Technical Abstract:This proposal aims to understand the effect of organic/inorganic hybridization on the nanoscopic ferroelectric phase and domain structures in polymer-tethered hybrid BaTiO3 nanocrystals, and extend the underlying mechanism to other lead-free relaxor ferroelectric systems to achieve high dielectric constants for various potential electrical applications. First, novel amphiphilic nonlinear block copolymers are rationally designed and synthesized. Subsequently, uniform polymer-tethered hybrid BaTiO3 nanocrystals with precisely tailored dimensions are crafted by employing amphiphilic nonlinear block copolymers as nanoreactors. The nanoscale ferroelectric phase and domain structures in polymer-tethered hybrid BaTiO3 nanocrystals are interrogated using high-resolution transmission electron microscopy, and the mechanism of their relaxor ferroelectric behavior can be unraveled. Finally, the underlying mechanism are extended to create other lead-free relaxor ferroelectric nanocrystals with even higher dielectric constants.

Nontechnical Abstract:Nanostructured ferroelectric materials show great potential for future micro- and nano-electronic applications, including wearable medical sensors for human monitoring, non-volatile ferroelectric memory, piezoelectric/electrostrictive actuation, second harmonic generation imaging, energy harvesting and storage, electrocaloric cooling和液晶显示。不幸的是，随着铁电材料的尺寸减小到几十纳米，由于铁电相的稳定，它们的高介电特性最终消失了。因此，高度希望开发具有稳定的铁电相和纳米域的新型高介电常数铁电晶体。对聚合物缺陷诱导的无机纳米晶体内的铁电纳米域的理解铺平了创造许多其他有趣的铁电纳米晶体的方式。同时，该研究项目通过研究生，本科生，高中科学老师和高中生之间的紧密互动与纳米科学教育相结合，这是在多层次学习经验中受到乔治亚理工大学和案例西部储备大学发现兴奋的启发的多层次学习经验。目标是刺激高中生在科学，技术，工程和数学（STEM）领域的兴趣，并更好地为与STEM相关的职业做好准备。为了提高公众对纳米科学和纳米技术的认识，通过科学期刊中的出版物，国家会议和讲习班的演讲，研究结果被广泛地传播到多个选区。聚合物螺旋型杂种BATIO3纳米晶中的相位和域结构，并将基本机理扩展到其他无铅宽松的铁电系统，以实现高介电常数，以实现各种潜在电气应用。首先，新型的两亲性非线性块共聚物是合理设计和合成的。随后，通过使用两亲性非线性块共聚物作为纳米反应器来精心制作具有精确定制尺寸的均匀聚合物混合动力BATIO3纳米晶体。使用高分辨率的透射电子显微镜询问聚合物螺旋型BATIO3纳米晶体中的纳米级铁电相和结构域结构，并且可以解开其宽松的铁电行为的机制。最后，扩展了基本机制以创建其他无铅宽松的铁电纳米晶体，具有更高的介电常数。

项目成果

Synthesis of Amphiphilic and Double Hydrophilic Star-like Block Copolymers and the Dual pH-Responsiveness of Unimolecular Micelle

两亲双亲水星状嵌段共聚物的合成及单分子胶束的双pH响应性

• DOI: 10.1021/acs.macromol.0c00918
• 发表时间: 2020
• 期刊: Macromolecules
• 影响因子: 5.5
• 作者: Harn, Yeu-Wei;He, Yanjie;Wang, Zewei;Chen, Yihuang;Liang, Shuang;Li, Zili;Li, Qiong;Zhu, Lei;Lin, Zhiqun
• 通讯作者: Lin, Zhiqun

From Precision Synthesis of Block Copolymers to Properties and Applications of Nanoparticles

从嵌段共聚物的精密合成到纳米粒子的性质和应用

• DOI: 10.1002/anie.201705019
• 发表时间: 2018-02-19
• 期刊: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
• 影响因子: 16.6
• 作者: Li, Xiao;Iocozzia, James;Lin, Zhiqun
• 通讯作者: Lin, Zhiqun

Enabling PIEZOpotential in PIEZOelectric Semiconductors for Enhanced Catalytic Activities

• DOI: 10.1002/anie.201811709
• 发表时间: 2019-06-03
• 期刊: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
• 影响因子: 16.6
• 作者: Wang, Mengye;Wang, Biao;Lin, Zhiqun
• 通讯作者: Lin, Zhiqun

Barium titanate at the nanoscale: controlled synthesis and dielectric and ferroelectric properties

• DOI: 10.1039/c8cs00583d
• 发表时间: 2019-02-21
• 期刊: CHEMICAL SOCIETY REVIEWS
• 影响因子: 46.2
• 作者: Jiang, Beibei;Iocozzia, James;Lin, Zhiqun
• 通讯作者: Lin, Zhiqun

Understanding the Mechanism of Star-Block Copolymers as Nanoreactors for Synthesis of Well-Defined Silver Nanoparticles

了解星块共聚物作为纳米反应器合成明确银纳米粒子的机制

• 发表时间: 2018
• 期刊: Journal of emerging investigators
• 作者: Zhu, Albert;Li, Qiong;Chen, Xiaoyi
• 通讯作者: Chen, Xiaoyi