Collaborative Research: RUI: Patterned Doping of Layered Materials

合作研究：RUI：层状材料的图案化掺杂

• 批准号: 2300639
• 负责人: Andrew Stollenwerk
• 金额: $ 24.48万
• 依托单位: University of Northern Iowa
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-08-01 至 2026-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2300639&HistoricalAwards=false
• 关键词: Collaborative; Research; RUI; Patterned; Doping

Non-Technical Abstract: The research team has developed a method to incorporate impurities into layered materials, such as graphite, on the micrometer and nanometer scale. These impurities modify the physical, electronic, and optical properties of the layered materials. These properties have applications in solar cells, light emitting diodes (LEDs), and quantum computers to name a few. The ability to control impurities at the nanometer scale enables scientists and engineers to reduce the size of current devices, and possibly even discover new applications. The goal of this research is to use a multidisciplinary approach to obtain a more complete understanding of these samples. The University of Northern Iowa leads the fabrication efforts of impurity samples as well as characterization of their physical and electronic properties. Optical properties will be characterized at Texas Tech University. This research involves undergraduate students trained on a wide variety of techniques and technologies. Such an environment results in well-rounded students ready for careers in either industry or academia. As a leader in K-12 education, the University of Northern Iowa provides an excellent opportunity for this project to have a positive impact on elementary, middle, and high school students from diverse backgrounds. Regular contact with high school science teachers allows faculty research activities and student opportunities to be showcased directly. Such efforts encourage students to explore careers in STEM (science, technology, engineering, and mathematics) fields. Technical Abstract: Layered crystals exhibit a rich variety of phases such as magnetism, spin-glass behavior, superconductivity, and charge density waves. These phases can occur naturally in pure systems or be induced, disrupted, or modified via doping. Intercalation is a form of doping, in which atoms or molecules are inserted between the molecular layers. The research team has discovered a new method to locally intercalate layered crystals using a focused high energy electron beam. The goal of this research is to explore the ability to control phases in layered crystals on the micrometer and nanometer scale. The ability to create localized phase changes permits an exploration of a range of boundary conditions between different electronic or magnetic phases, as well as tunneling between them. This technique can be used in finite layer systems to reduce interlayer coupling and perhaps create new opportunities for entirely new two-dimensional behaviors.The collaborative effort between the University of Northern Iowa and Texas Tech University has the combined capabilities of atomic force microscopy, scanning tunneling microscopy, and Raman spectroscopy to characterize the local physical, electrical, and optical properties of these materials. The PIs work with a diverse group of research assistants and attract undergraduates from a variety of backgrounds and majors. An additional benefit of this collaborative work is the opportunity for undergraduate students from Iowa to work with graduate students from Texas Tech University. Lubbock, TX, has a very different culture and population than Cedar Falls, IA, which will benefit all students in learning to work with individuals from diverse backgrounds as is necessary in modern research.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.

非技术摘要：研究团队已经开发了一种将杂质在微米和纳米尺度上纳入石墨等分层材料中的方法。这些杂质改变了分层材料的物理，电子和光学特性。这些属性在太阳能电池，发射二极管（LED）和量子计算机中具有应用。在纳米尺度上控制杂质的能力使科学家和工程师能够减少当前设备的大小，甚至可能发现新的应用程序。这项研究的目的是使用多学科方法来获得对这些样本的更完整了解。爱荷华州北部领导着杂质样本的制造工作以及其物理和电子特性的表征。德克萨斯理工大学的光学特性将被描述。这项研究涉及接受各种技术和技术培训的本科生。这样的环境导致全面的学生准备在行业或学术界的职业。作为K-12教育的领导者，爱荷华州北部为该项目提供了一个极好的机会，可以对来自不同背景的小学，中学和高中生产生积极影响。与高中科学老师的定期联系可以直接展示教师研究活动和学生机会。这样的努力鼓励学生探索STEM（科学，技术，工程和数学）领域的职业。技术摘要：分层晶体表现出各种各样的阶段，例如磁力，旋转玻璃行为，超导性和电荷密度波。这些阶段可以自然发生在纯系统中，也可以通过掺杂诱导，破坏或修饰。插入是掺杂的一种形式，其中原子或分子在分子层之间插入。研究团队发现了一种使用聚焦高能电子束的新方法来局部间层状晶体。这项研究的目的是探索在微米和纳米尺度上控制分层晶体中的相位的能力。创建局部相变的能力允许探索不同电子或磁相之间的一系列边界条件以及它们之间的隧道。该技术可用于有限层系统来减少层间耦合，并可能为全新的二维行为创造新的机会。爱荷华大学北部大学与德克萨斯理工大学的协作努力具有原子力显微镜的结合功能，扫描了隧道显微镜，以及Raman Spectrospoppy，以及将物质绘制物质，以及属性的属性，以及这些材料，并将其特性化。 PI与各种各样的研究助理一起工作，并吸引了来自各种背景和专业的大学生。这项合作工作的另一个好处是，来自爱荷华州的本科生与得克萨斯理工大学的研究生合作的机会。德克萨斯州拉伯克（Lubbock，TX）的文化和人口与IA的雪松瀑布（Cedar Falls）具有截然不同的文化和人口，这将使所有学生在现代研究中有必要与来自不同背景的个人合作。该奖项反映了NSF的法定任务，并被视为值得通过基金会的知识分子和更广泛影响的评估来审查审查审查的审查标准。