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Moire Patterns and the Mechanics of Defects and Interfaces in 2D Materials

二维材料中的莫尔图案以及缺陷和界面的力学

基本信息

批准号：
1825300
负责人：
Harley Johnson
金额：
$ 38.71万
依托单位：
University of Illinois at Urbana-Champaign
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-09-01 至 2022-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1825300&HistoricalAwards=false
关键词：
Moire Patterns Mechanics Defects Interfaces

项目摘要

Graphene and other atomically thin, two-dimensional layered materials can be used as surface additives to tailor the mechanical properties of materials, despite their extreme thinness. For example, coating the surface of a metal with single layer of graphene can effectively stiffen and strengthen the underlying material, as well as enable unusual friction and wear properties. The organized stacking of a graphene layer on another surface, each having different atomic arrangements, results in what is called a heterostructure. Moire patterns form as a result of periodic arrangements of aligned and misaligned atomic stacking in the layers. These Moire patterns are the signature of modifications of the electric and mechanical properties of the stacked materials, and the origin of new heterostructure behavior. This study will advance the science of two-dimensional materials by creating new theoretical and experimental tools to: probe the mechanics of the Moire patterns at the atomic scale, discover new useful material behavior, and reveal strategies to leverage these properties at larger scales. The success of the project will advance the national health, prosperity, and welfare by facilitating design and fabrication of advanced materials with superior properties. As part of the project, a Science, Technology, Engineering, Art and Math (STEAM) activity on the Art of Moire will be created for middle and high school girls through an extensive collaboration with the School of Arts+Design. This will be an annual summer camps to excite and motivate female students about engineering by connecting art and design to the mechanics of materials.Heterostructures of 2D materials are a unique space for engineering design, both for discovering new emergent phenomena and for developing novel devices. The objective of the study is to explore the mechanics of Moire patterns observed in vertical, or stacked, interfaces between 2D materials and their defects. The study is driven by the hypothesis that defects in stacked 2D materials endow heterostructures with unusual mechanical and electronic properties. A grand-canonical minimum hopping (GCMH) computational method will be applied within the LAMMPS molecular dynamics framework to resolve defect structure and motion in 2D material layers and their heterostructures. Mechanical Atomic Force Microscopy (AFM) techniques will be used to measure the mechanics of the Moire patterns of graphene on various crystalline substrates. The use of calibrated multi-frequency and lateral force AFM to observe the Moire will give information on the local modulation of elastic, plastic, and frictional properties. These complementary studies will be used to uncover the energetics of partial dislocation reconstructions unique to 2D materials, defect interactions, and coupling to out-of-plane deformation.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.

石墨烯和其他原子级薄的二维层状材料可以用作表面添加剂来调整材料的机械性能，尽管它们非常薄。例如，在金属表面涂上单层石墨烯可以有效地增强底层材料的硬度，并具有不同寻常的摩擦和磨损性能。在另一个表面上有组织地堆叠石墨烯层，每一层都有不同的原子排列，形成所谓的异质结构。云纹图案的形成是层中排列和不排列的原子堆叠的周期性排列的结果。这些云纹图案是堆叠材料电学和力学性能变化的标志，也是新的异质结构行为的起源。这项研究将通过创造新的理论和实验工具来推进二维材料的科学：在原子尺度上探测云纹图案的力学，发现新的有用的材料行为，并揭示在更大尺度上利用这些特性的策略。该项目的成功将促进具有优越性能的先进材料的设计和制造，从而促进国家的健康、繁荣和福祉。作为该项目的一部分，通过与艺术与设计学院的广泛合作，将为初中和高中女生创建一个关于龟纹艺术的科学、技术、工程、艺术和数学（STEAM）活动。这将是一个年度夏令营，通过将艺术和设计与材料力学联系起来，激发和激励女学生对工程的兴趣。二维材料的异质结构是一个独特的工程设计空间，无论是发现新的突发现象还是开发新的器件。该研究的目的是探索在二维材料及其缺陷之间的垂直或堆叠界面中观察到的云纹图案的力学。这项研究是由这样的假设驱动的：堆积的二维材料中的缺陷赋予异质结构不同寻常的机械和电子性能。在LAMMPS分子动力学框架内，采用一种大规范最小跳变（GCMH）计算方法来求解二维材料层及其异质结构中的缺陷结构和运动。机械原子力显微镜（AFM）技术将用于测量石墨烯在各种晶体基底上的云纹图案的力学性质。使用校准的多频率和侧向力AFM来观察云纹将提供有关弹性，塑性和摩擦特性的局部调制的信息。这些互补研究将用于揭示二维材料特有的部分位错重建、缺陷相互作用和面外变形耦合的能量学。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

期刊论文数量（7）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Elastic modulus scaling in graphene-metal composite nanoribbons

DOI：
10.1088/1361-6463/ab7329
发表时间：
2020-03
期刊：
Journal of Physics D: Applied Physics
影响因子：
0
作者：
Kaihao Zhang;Mitisha Surana;R. Haasch;S. Tawfick
通讯作者：
Kaihao Zhang;Mitisha Surana;R. Haasch;S. Tawfick

Selection rules of twistronic angles in two-dimensional material flakes via dislocation theory

基于位错理论的二维材料片中扭转角的选择规则

DOI：
10.1103/physrevb.103.115427
发表时间：
2021
期刊：
Physical Review B
影响因子：
3.7
作者：
Zhu, Shuze;Annevelink, Emil;Pochet, Pascal;Johnson, Harley T.
通讯作者：
Johnson, Harley T.

Rotational stability of twisted bilayer graphene

DOI：
10.1103/physrevb.101.054109
发表时间：
2020-02-25
期刊：
PHYSICAL REVIEW B
影响因子：
3.7
作者：
Bagchi, S.;Johnson, H. T.;Chew, H. B.
通讯作者：
Chew, H. B.

Graphene-mediated stabilization of surface facets on metal substrates

DOI：
10.1063/5.0065107
发表时间：
2021-10-28
期刊：
JOURNAL OF APPLIED PHYSICS
影响因子：
3.2
作者：
Ananthakrishnan, Ganesh;Surana, Mitisha;Johnson, Harley T.
通讯作者：
Johnson, Harley T.

Crowd-Sourced Data and Analysis Tools for Advancing the Chemical Vapor Deposition of Graphene: Implications for Manufacturing

促进石墨烯化学气相沉积的众包数据和分析工具：对制造业的影响

DOI：
10.1021/acsanm.0c02018
发表时间：
2020
期刊：
ACS Applied Nano Materials
影响因子：
5.9
作者：
Schiller, Joshua A.;Toro, Ricardo;Shah, Aagam;Surana, Mitisha;Zhang, Kaihao;Robertson, Matthew;Miller, Kristina;Cruse, Kevin;Liu, Kevin;Seong, Bomsaerah
通讯作者：
Seong, Bomsaerah