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Nanomanufacturing of Atomically-Uniform Two-Dimensional Materials over Large Areas

大面积原子均匀二维材料的纳米制造

基本信息

批准号：
1760931
负责人：
Md Haque
金额：
$ 32.5万
依托单位：
Pennsylvania State Univ University Park
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：
2018-07-01 至 2022-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1760931&HistoricalAwards=false
关键词：
Nanomanufacturing Atomically Uniform Two Dimensional

项目摘要

This award supports research to overcome a challenge of mutual exclusiveness of the crystalline quality and lateral size in the manufacture of two-dimensional materials. Two-dimensional materials are atomically thin films with properties that can revolutionize low-power electronics, biological detection, multi-functional composites and energy storage applications that promise important benefits for the US society and economy. The roadblock to these applications is that, when grown in large size, the two-dimensional material's crystallinity is poor and conventional heat treatment does not improve the crystallinity because the materials are typically resistant to high temperatures. This award enables the investigation of a fundamentally different approach, where a two-dimensional material is grown over a large area with initially low quality, which is then greatly improved through the combination of electrical and mechanical treatments. This is a multi-disciplinary approach, which trains the graduate students in cutting edge aspects of nanomanufacturing, materials science and mechanical engineering. The project involves undergraduate, women and under-represented minority students in research to better train the diverse work force of the future.This award investigates the manufacture of atomically thin two-dimensional (2D) materials over large areas by atomic layer or pulsed layer deposition. The as-grown nanosteets are usually of low crystallinity. The crystallinity is enhanced with a combination of electron wind force and mechanical stress. The electrons transfer their momentum at the defects and grain boundaries to impart unprecedented atomic/defect mobility at lower temperatures. The role of mechanical stress is to accelerate the electrical annealing. The hypothesis is that the stress field around the defect can intensify the local strain energy, which is a driving force for crystallization and grain growth. Computational models, based on reactive empirical bond-order potential with the electron wind force imparted to individual atoms, are developed to guide the experimental research. Experiments are performed inside the transmission electron microscope to understand the synthesis of ultra-thin films and electro-mechanical annealing. The in-situ microscopy reveals the transformation from a low quality amorphous phase to a highly crystalline state. The research demonstrates that high crystallinity 2D atomic layer materials can be achieved by a novel electrical and mechanical treatment instead of conventional heat treatment. The research also investigates scaling up of this technique by wafer-scale synthesis on a substrate coated for high residual stress followed by electrical annealing.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.

该奖项支持研究，以克服在二维材料制造中晶体质量和横向尺寸相互排斥的挑战。二维材料是原子级薄膜，其特性可以彻底改变低功耗电子器件，生物检测，多功能复合材料和储能应用，为美国社会和经济带来重要利益。这些应用的障碍是，当以大尺寸生长时，二维材料的结晶度差，并且常规热处理不能改善结晶度，因为材料通常耐高温。该奖项使人们能够研究一种根本不同的方法，即在最初质量较低的大面积上生长二维材料，然后通过电气和机械处理的结合大大改善。这是一个多学科的方法，培养研究生在纳米制造，材料科学和机械工程的前沿方面。该项目涉及本科生、女性和少数民族学生的研究，以更好地培养未来的多样化劳动力。该奖项研究通过原子层或脉冲层沉积在大面积上制造原子级薄的二维（2D）材料。所生长的纳米钢通常具有低结晶度。电子风力和机械应力的组合提高了结晶度。电子在缺陷和晶界处转移其动量，以在较低温度下赋予前所未有的原子/缺陷迁移率。机械应力的作用是加速电退火。假设缺陷周围的应力场可以增强局部应变能，这是晶化和晶粒长大的驱动力。计算模型，基于反应经验键级势与电子风力赋予单个原子，发展到指导实验研究。在透射电子显微镜内进行实验，以了解超薄膜的合成和机电退火。原位显微镜揭示了从低质量的非晶相到高度结晶状态的转变。研究表明，高结晶度的二维原子层材料可以通过一种新的电气和机械处理，而不是传统的热处理。该研究还调查了通过在高残余应力涂层衬底上进行晶圆级合成，然后进行电退火，从而扩大该技术的规模。该奖项反映了NSF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（8）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Microstructural processing of steel at ambient surface temperature

DOI：
10.1016/j.msea.2021.141233
发表时间：
2021-04
期刊：
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
影响因子：
6.4
作者：
J. Kidd;Zahabul Islam;D. Waryoba;A. Haque
通讯作者：
J. Kidd;Zahabul Islam;D. Waryoba;A. Haque

Quality enhancement of low temperature metal organic chemical vapor deposited MoS2: an experimental and computational investigation