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：压电现象由雅克·居里和皮埃尔·居里于 1880 年发现。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，压电元件用作移动电话的压力传感器以及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米级运行，灵活透明，并且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，目标是实现下一代器件。二维材料的厚度为原子级，具有独特的光学和电学特性。它们的压电特性可用于实现机械驱动的透明柔性电荷产生装置。 该项目将实现微米级和纳米级创新器件的制造，并在医学、工业、环境工程和消费电子产品方面具有前所未有的应用。技术：材料的压电特性是由于材料晶体结构的非中心对称结构造成的。还已知一些材料的体结构是非压电的。然而，当它们被减薄为单层或多层时，它们表现出压电特性。在这项工作中，研究了二维材料的压电特性。它提出了一种增强弱压电二维材料压电性能的新技术。声表面波 (SAW) 用于增强 2D 材料的压电性能。 SAW 装置将构建在强压电材料岛上。行进的声波会对放置在基板上的二维材料产生应力和应变，这会增加二维材料的压电性能。使用声表面波（SAW）来激活与弱压电材料耦合的声波并引起弱压电材料的压电系数变化的技术是新颖的。在这项工作中，我们计划将该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。本研究中提出的方法极大地增强了二维材料的压电效应，并消除了文献中报道的其他技术的缺点。现有方法的缺点包括制造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。将测试和评估不同的二维材料，例如二硫化钼（MoS2）和硒化铟（InSe），包括那些常用的和研究较少的材料。这项工作的成果将大大扩展二维材料压电性的利用范围，并将成为电子、机电、传感器和光电领域更实用和新颖的器件。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，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