Scanning Electrochemical Microscopy and Ultramicroelectrode Studies: Electrochemistry of Single Molecules and Nanoparticles

扫描电化学显微镜和超微电极研究：单分子和纳米颗粒的电化学

• 批准号: 1707384
• 负责人: Allen Bard
• 金额: $ 41.43万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-01 至 2022-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1707384&HistoricalAwards=false
• 关键词: Scanning; Electrochemical; Microscopy; Ultramicroelectrode; Studies

This project is funded by the Chemical Measurement and Imaging Program of the Division of Chemistry. Professor Bard and his team at the University of Texas at Austin further develop scanning electrochemical microscopy (SECM) and ultramicroelectrodes to include new applications at lower concentrations (fM), and improved sensitivity. The work shifts the approach of chemical analysis for measurements of signals that arise from a very large number of molecules (ensembles) to measurements of single molecules, one at a time. Properties of single entities and effects of composition and structure can be investigated on an individual basis. The goal is to push the limits of single-entity electrochemistry to a regime of unprecedented sensitivity. The activities also contribute to the development of a diverse, globally competitive STEM workforce. Programs address training and technology transfer with the goal of training students and professional researchers to apply the new methods and approach to their own research problems. Young chemists participate in hands-on, multidisciplinary scientific research in areas of national importance. These researchers gain valuable experience, working closely with the PI and visiting scientists. In these fundamental studies, digital electrochemistry allows for single analyte species and single entities to be counted and specifically detected one at a time. The central thrust is the improved understanding of nanoparticle collision responses that is being extended to the area of detection of single atoms and potentially to single electron-transfer events. The approach is unique in focusing on: 1) understanding the detailed electrochemical responses during collision events at electrodes, 2) detecting and selectively identifying single small ions, molecules, and atoms, and 3) developing methods of detecting very small amounts of charge using nanoelectrodes (less than 10 electrons, perhaps single electron-transfer events). Young chemists are trained in advanced techniques, interact through group meetings, seminars, teaching, publishing, and conference presentations.

该项目由化学部的化学测量和成像计划资助。德克萨斯大学奥斯汀分校的Bard教授和他的团队进一步开发了扫描电化学显微镜（SECM）和超微电极，以包括低浓度（fM）的新应用和提高的灵敏度。这项工作将测量大量分子（集合）产生的信号的化学分析方法转移到测量单个分子，一次一个。单个实体的性质以及组成和结构的影响可以在个体的基础上进行研究。我们的目标是将单一实体电化学的极限推向前所未有的灵敏度。这些活动还有助于发展多元化，具有全球竞争力的STEM劳动力。该计划旨在培训学生和专业研究人员将新方法和方法应用于自己的研究问题。年轻的化学家参与国家重要领域的实践，多学科科学研究。这些研究人员获得宝贵的经验，与PI和访问科学家密切合作。在这些基础研究中，数字电化学允许对单个分析物种类和单个实体进行计数，并且一次一个地进行特异性检测。中心推力是纳米粒子碰撞反应的理解，正在扩展到检测单原子和潜在的单电子转移事件的领域。该方法的独特之处在于：1）了解电极碰撞事件期间的详细电化学响应，2）检测和选择性识别单个小离子，分子和原子，以及3）开发使用纳米电极检测非常少量电荷（少于10个电子，可能是单个电子转移事件）的方法。年轻的化学家接受先进技术的培训，通过小组会议，研讨会，教学，出版和会议演示进行互动。

项目成果

Atom-by-atom electrodeposition of single isolated cobalt oxide molecules and clusters for studying the oxygen evolution reaction

• DOI: 10.1073/pnas.2002168117
• 发表时间: 2020-06-09
• 期刊: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• 影响因子: 11.1
• 作者: Jin, Zhaoyu;Bard, Allen J.
• 通讯作者: Bard, Allen J.

Extraordinary Dielectric Properties at Heterojunctions of Amorphous Ferroelectrics

• DOI: 10.1021/jacs.8b09603
• 发表时间: 2018-12-26
• 期刊: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
• 影响因子: 15
• 作者: Braga, M. Helena;Oliveira, Joana E.;Goodenough, John B.
• 通讯作者: Goodenough, John B.