LEAPS-MPS: Electric field sensing with nitrogen vacancy centers and chemical tuning of the diamond host

LEAPS-MPS：利用氮空位中心的电场传感和金刚石主体的化学调谐

• 批准号: 2213520
• 负责人: Abraham Wolcott
• 金额: $ 23.17万
• 依托单位: San Jose State University Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2213520&HistoricalAwards=false
• 关键词: LEAPS; MPS; Electric; field; sensing

This award is funded in whole or in part under the American Rescue Plan Act of 2021 (Public Law 117-2). Non-technical Description. Diamond has many properties that make it valuable well beyond its use as a gemstone. Notably, diamond hosts a sensitive detector of magnetic and electric fields: the nitrogen vacancy (NV) center. Such NV centers can be used to sense magnetic objects and have potential for use as quantum bits (qubits) in the quantum computers of the future. Diamond’s chemical inertness, its reluctance to change or be modified, is both a challenge and an opportunity for materials chemists, physicists and engineers. Changing chemical bonds on the surface of diamond allows for the attachment of molecular groups and anchoring points for measurement and detection. In this LEAPS-MPS project, the PI and his team will explore the surface chemistry of diamond and investigate how the light given off by the NV center changes with an applied voltage. The surface chemistry of nanoscale diamonds and the behavior of the NV center will be simultaneously examined with the long-term aim of making a more advanced quantum sensor. Undergraduate students will learn advanced chemistry and spectroscopy techniques, including use of the Stanford Synchrotron Radiation Lightsource. Recruitment of talent is in collaboration with the Black Leadership and Opportunity Center (BLOC) and other student-based organizations at San Jose State University. This project will provide rigorous and wide-ranging research experiences to prepare scientists and engineers for a successful career by providing the skills to execute a research project, manage troubleshooting, prepare an impactful research presentation and build their resume for future success.Technical Description. In this LEAPS-MPS project, the PI will explore new routes to chemically activate the surface of nanoscale high-pressure high-temperature nanoscale diamonds 25 to 100 nm in size to generate new covalent bonds and examine the photophysics of NV centers. By tuning the surface dipole moment of the diamond host, researchers will investigate a largely unexplored space of NV voltage sensing with spectroelectrochemistry. Activation of the diamond surface will occur with wet chemistry under inert conditions and a series of nucleophiles are reacted with the “activated” diamond constructs. Confirmation of the atomic and molecular structure of the diamond constructs will occur with overlapping surface sensitive techniques including X-ray photoelectron spectroscopy and synchrotron-based X-ray spectroscopies at the Stanford Synchrotron Radiation Lightsource. The surface modified samples are deposited onto transparent conducting electrodes and NV center fluorescence is tracked as a function of applied voltage in a custom microscope. A series of voltage sweep parameters are modified to understand how the NV center can toggle between its fluorescent charge states. A working model is then generated to explain the NV center fluorescent properties as a function of surface dipole moment, charge density and charge identity. This diamond project is conducted by a highly diverse cohort of researchers from many disciplines including the physical sciences, life sciences and engineering disciplines. Researchers acquire an advanced skill set during the project cycle and will be able to successfully apply to PhD programs, work at national laboratories or enter into industrial positions upon graduation.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）全部或部分资助的。非技术描述。 Diamond拥有许多特性，使其具有远远超出其用作宝石的价值。值得注意的是，Diamond拥有磁场和电场的敏感探测器：氮空位（NV）中心。此类NV中心可用于感知磁对象，并具有未来量子计算机中用作量子位（Qubit）的潜力。钻石的化学惰性，不愿改变或修改，既是材料化学家，物理学家和工程师的挑战，也是一个机会。钻石表面上的化学键变化可以使分子基团的附着和锚定点进行测量和检测。在这个飞跃MPS项目中，PI和他的团队将探索钻石的地面化学，并调查NV中心发出的光线如何随施加电压而变化。纳米级钻石的表面化学和NV中心的行为将以制造更先进的量子传感器的长期目的进行检查。本科生将学习先进的化学和光谱技术，包括使用斯坦福同步辐射光线。招聘人才招募与黑人领导力和机会中心（BLOC）以及圣何塞州立大学的其他学生组织合作。该项目将提供严格而广泛的研究经验，以通过提供执行研究项目，管理故障排除，准备有影响力的研究演示文稿并为未来成功的简历而提供技能，为科学家和工程师提供成功的职业。在这个LEAP-MPS项目中，PI将探索新的途径，以化学激活纳米级高压高温纳米级钻石的表面25至100 nm的大小，以产生新的共价键并检查NV中心的光体物理。通过调整钻石宿主的表面偶极矩，研究人员将使用光谱电化学研究NV电压灵敏度的大型意外空间。钻石表面的激活将在惰性条件下与湿化学物发生发生，并且一系列核粉状物与“活化”的钻石构建体反应。在斯坦福同步辐射照明仪上的重叠表面敏感技术（包括X射线光电子光谱和基于同步加速器的X射线光谱）（包括X射线光电子光谱和基于同步加速器的X射线光谱），将出现钻石构建体的原子和分子结构的确认。表面修饰的样品沉积到透明导电电极上，并跟踪NV中心荧光作为自定义显微镜中施加电压的函数。修改了一系列电压扫描参数，以了解NV中心如何在其荧光电荷状态之间切换。然后生成一个工作模型，以解释NV中心荧光特性，这是表面偶极矩，电荷密度和电荷身份的函数。这个钻石项目是由来自许多学科的研究人员组成的，包括物理科学，生命科学和工程学科。研究人员在项目周期期间获得了高级技能，并将能够成功地申请博士学位课程，在国家实验室工作或毕业后进入工业职位。该奖项反映了NSF的法定任务，并通过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支持支持。