CAREER: Investigation of Thermal Transport in Moiré Pattern Structured Materials to Push the Extremes of Thermal Modulation

职业：研究莫尔图案结构材料中的热传输以推动热调制的极限

• 批准号: 2145417
• 负责人: Xian Zhang
• 金额: $ 50万
• 依托单位: Stevens Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-07-01 至 2027-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2145417&HistoricalAwards=false
• 关键词: CAREER; Investigation; Thermal; Transport; Moir

This award is funded in whole or in part under the American Rescue Plan Act of 2021 (Public Law 117-2).Wearable devices made of two-dimensional (2D) materials based on atomically thin crystals such as graphene promise to revolutionize modern microelectronics by enabling high flexibility, intrinsic thinness, and unprecedented device performance. However, one significant challenge to the advancement of diverse and transformative applications is gaining control over thermal transport. For example, thermal transport needs to be increased to compensate for the heating issue caused by the reduced thermal conductivity at high levels of stress and decreased for efficient thermoelectric energy conversion and thermal insulation devices. The overarching goal of this research is to achieve efficient, in-situ, and reversible thermal control via manipulating 2D materials’ Moiré patterns, which are created by adjusting the relative twist angle of mismatching crystal lattice between the two 2D materials. The knowledge learned will potentially push the thermal modulation limits in skin-like wearable devices made of atomically thin 2D materials, and enable modern devices from beyond-Si electronics and sensors to superconducting thermal switches. This project will tightly integrate research, education and outreach, with interactive games, workshops, novel curriculum, hands-on research mentoring, and research tool sharing to engage students in thermal technology.The proposed research aims to create new knowledge about crystal lattice order enabled thermal transport and develop twist angle tuning as a powerful strategy for thermal modulation. The twist angle tuning method applied to 2D Moiré pattern structured materials provides an in-situ, continuous and reversible tuning strategy without the need for changing the materials’ chemical composition, thereby bypassing the challenges associated with traditional wearable devices. Experimental approaches of materials synthesis, device nanofabrication and thermal characterization are emphasized and reinforced by analytical modeling. By systematically varying twist angle as well as the 2D Moiré patterns’ mechanical deformation and global geometry, in-depth understanding of lattice orders, lattice constants, geometry and thermal conductivity will be uncovered. Such knowledge will be a major leap in fundamental understanding of thermal physics, establish thermal modulation principles to achieve desired thermal transport outcomes, and revolutionize future wearable device platforms.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.

该奖项是根据2021年《美国救援计划法》（公法117-2）的全部或部分资助的。由基于原子上薄晶体（例如石墨烯）的二维（2D）材料制成的可校准设备，例如通过具有较高的灵活性，内在的薄度和未预防的设备性能来革新现代微电子。但是，对多样性和变革性应用的进步的一个重大挑战是对热运输的控制。例如，需要增加热运输，以补偿由于高压力下的热导率降低而引起的加热问题，并改善了有效的热电能量转换和热绝缘设备。这项研究的总体目标是通过操纵2D材料的Moiré模式来实现有效的，原位和可逆的热控制，这些模式是通过调整两种2D材料之间不匹配晶体晶格的相对扭曲角而创建的。学到的知识可能会推动由原子薄的2D材料制成的皮肤样可穿戴设备的热调节限制，并使现代设备从超越SI电子和传感器到超导热开关。该项目将将研究，教育和外展紧密整合，互动游戏，研讨会，新颖的课程，动手研究心理和研究工具共享，以吸引学生参与热技术。拟议的研究旨在创建有关水晶晶格订单的新知识，以实现热量运输和开发扭转角度，以开发扭转角度作为热量调节的强大策略。适用于2DMoiré图案结构材料的扭曲角度调整方法提供了原位，连续和可逆的调整策略，而无需更改材料的化学成分，从而绕开了与传统可穿戴设备相关的挑战。通过分析建模可以强调和加强材料合成，装置纳米化和热表征的实验方法。通过系统地变化的扭曲角以及2DMoiré模式的机械变形和全局几何形状，将发现对晶格订单，晶格常数，几何和导电性的深入了解。这种知识将是对热物理学的基本理解，建立热调制原则以实现所需的热运输成果的重大飞跃，并彻底改变了未来的可穿戴设备平台。这项奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响审查标准来通过评估来诚实地认为通过评估。

项目成果

On the role of crystal defects on the lattice thermal conductivity of monolayer WSe2 (P63/mmc) thermoelectric materials by DFT calculation

• DOI: 10.1016/j.spmi.2021.107057
• 发表时间: 2021-07
• 期刊: Superlattices and Microstructures
• 影响因子: 3.1
• 作者: Yingtao Wang;Xian Zhang