EAGER: Enhancement of Piezoelectric Properties in two-dimensional materials and its application

EAGER：二维材料压电性能的增强及其应用

• 批准号: 2033044
• 负责人: Mona Zaghloul
• 金额: $ 15万
• 依托单位: George Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-08-01 至 2023-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2033044&HistoricalAwards=false
• 关键词: EAGER; Enhancement; Piezoelectric; Properties; two

Non-technical:Piezoelectricity was discovered in 1880 by Jacques and Pierre Curie. This property allows materials to convert mechanical stress into electrical signals and vice versa. Piezoelectric devices have important applications in medicine, aerospace, transportation and consumer electronics. For example, piezoelectric elements are used as pressure sensors mobile phones and to monitor combustion in internal combustion engines. For future applications, sensors should operate at nanoscale or microscale level, be flexible and transparent, and easy to integrate with conventional electronics. This project will investigate piezoelectricity in novel two-dimensional (2D) materials, with the aim of realizing next generation devices. 2D materials are atomically thick and have unique optical and electrical properties. Their piezoelectric properties could be used realize mechanically powered transparent flexible charge-generating devices. This project will enable the fabrication of innovative devices at the microscale and nanoscale with unprecedented applications in medicine, industry, environmental engineering, and consumer electronics.Technical:Piezoelectric properties in materials are due to non-centrosymmetric structure of the material crystal structure. It is also known that some materials are non-piezoelectric in their bulk structure. However, when they are thinned in monolayer or several layers, they show piezoelectricity properties. In this work the piezoelectric properties for 2D materials are studied. It presents a novel technique for enhancement of piezoelectric properties in weak piezoelectric two-dimensional materials. Surface Acoustic Waves (SAW) are used to enhance the piezoelectric properties of 2D materials. The SAW device will be built on an island of strong Piezoelectric material. The traveling acoustic wave would cause stress and strain on the two-dimensional materials placed on the substrate, which would increase the piezoelectric properties of the two-dimensional materials. The technique of using Surface Acoustic Waves (SAW) to activate acoustic waves that couple to the weak piezoelectric material and cause changes in the piezoelectric coefficient of the weak piezoelectric material is novel. In this work we are planning to apply this technique to several two-dimensional materials and measure improved piezoelectric coefficients and their applications, such as in sensors. The proposed method in this research greatly enhances the piezoelectric effect of 2D materials and eliminates the disadvantages of other techniques reported in the literature. The drawbacks in current methods include high demand of fabrication complexity and precision, high cost, and the limitation of the number of stacked layers of 2D materials. Different 2D materials such as molybdenum disulfide (MoS2) and indium selenide (InSe) will be tested and evaluated, including those commonly used and less-studied ones. The outcome of this proposed work will largely extend the utilization range of piezoelectricity of 2D materials, and will turn into more practical and novel devices in electronic, electromechanical, sensors, and optoelectronic fields.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术性：压电是1880年由雅克和皮埃尔·居里发现的。这种特性允许材料将机械应力转换为电信号，反之亦然。压电器件在医学、航空航天、交通运输和消费电子领域有着重要的应用。例如，压电元件被用作移动电话的压力传感器和监测内燃机的燃烧情况。对于未来的应用，传感器应该在纳米级或微尺度上工作，灵活透明，易于与传统电子设备集成。该项目将研究新型二维（2D）材料中的压电性，目的是实现下一代设备。二维材料具有原子厚度，具有独特的光学和电学特性。它们的压电特性可以用来实现机械驱动的透明柔性电荷产生装置。该项目将使创新设备在微尺度和纳米尺度上的制造成为可能，在医学、工业、环境工程和消费电子领域有着前所未有的应用。技术：材料中的压电特性是由于材料晶体结构的非中心对称结构。我们还知道，有些材料的体结构是非压电的。然而，当它们被薄化成单层或多层时，它们表现出压电特性。本文对二维材料的压电特性进行了研究。提出了一种增强二维弱压电材料压电性能的新方法。表面声波（SAW）被用来提高二维材料的压电性能。SAW装置将建在一个由坚固的压电材料构成的岛屿上。声波的传播会对放置在基板上的二维材料产生应力和应变，从而提高二维材料的压电性能。利用表面声波激发声波与弱压电材料耦合，引起弱压电材料压电系数变化的技术是一种新颖的技术。在这项工作中，我们计划将这项技术应用于几种二维材料，并测量改进的压电系数及其应用，例如在传感器中。本研究提出的方法大大增强了二维材料的压电效应，消除了文献中其他技术的缺点。现有方法的缺点是对制造的复杂性和精度要求高，成本高，以及二维材料堆叠层数的限制。不同的二维材料，如二硫化钼（MoS2）和硒化铟（InSe）将被测试和评估，包括那些常用的和研究较少的材料。本文的研究成果将极大地扩展二维材料压电性的应用范围，并将在电子、机电、传感器、光电等领域成为更加实用和新颖的器件。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

"Piezoelectric Coefficient and Permittivity Changes in Piezoelectric Material ZnO as Functions of Applied Electric Field

“压电材料 ZnO 的压电系数和介电常数随外加电场的变化

• DOI: 10.23919/ursigass51995.2021.9560514
• 发表时间: 2021
• 期刊: Italy
• 作者: You Zhou, Mona Zaghloul