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.

非技术摘要：纳米结构的铁电材料在未来的微型和纳米电源应用中显示出巨大的潜力，包括用于人体监测的可穿戴医疗传感器，非挥发性铁电记忆，压电/电击驱动性驱动，第二次和式高温产生，能源产生成像，液体式冷却，液态，以及液体透性，以及晶体的液体晶体，以及。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。目标是激发高中生在科学，技术，工程和数学（STEM）领域的兴趣，并更好地为本科生准备与STEM相关的职业。为了增强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，研究结果被广泛地分解为多个选区。技术摘要：该提案旨在了解有机/无机型纳米型型纳米型型纳米型型纳米型型纳米型型和构成型纳米型型的效果。纳米晶体，并将基本机制扩展到其他无铅宽松的铁电系统，以实现高介电常数以用于各种潜在的电气应用。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制定具有精确定制尺寸的均匀聚合物融合型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