Understanding Redox Reaction Mechanism and Dynamics at Single Nanoparticles Using ECL and Scanning Nanoelectrode with Improved Spatial and Spectral Resolution

在这项由美国国家科学基金会化学部化学测量和成像计划资助的项目中，阿拉巴马大学的潘尚林教授正在开发电化学和光谱技术，以帮助解决在纳米尺度上研究氧化还原事件的传统电化学方法的技术和科学挑战。将使用光学光谱、纳米电化学和成像技术的组合方法来应对这些挑战。通过注重将研究项目与高中教师的教育和培训以及教育单元的开发相结合的外联工作，解决了更广泛的影响。从事这个项目的学生将成为一个跨学科团队的一部分，并将在光谱电化学和材料科学领域进行交叉培训。这些技能将在他们未来的职业生涯中很好地帮助他们。拟议的教育活动将有助于加强阿拉巴马州地区少数民族学生和教师的招聘和留用。该提案旨在解决利用改进的光谱电化学技术了解单个金属纳米颗粒(NPs)的详细氧化还原反应机理和等离子体与电致化学发光(ECL)相互作用的科学和技术挑战。该提案的任务-1涉及使用单一金属NPs的ECL研究局部电化学反应及其时间和空间异质性。TASK-2是为了解决单个NPs局部电化学事件与形状的关系而设计的扫描纳米电极探针法，该方法具有超空间分辨率，超越了光学衍射极限，并且对于探测局部界面电荷转移事件具有可靠的光谱分辨率。

In this project funded by the Chemical Measurement & Imaging Program of the Chemistry Division of the NSF, Professor Shanlin Pan of The University of Alabama is developing electrochemistry and spectroscopy techniques to help address technical and scientific challenges of conventional electrochemistry methods for studying redox events at the nanometer scale. Combined methods of optical spectroscopy, nanoelectrochemistry, and imaging techniques will be used to address these challenges. The broader impacts are addressed in through outreach efforts focus on integrating the research project with education and training of high school teachers as well as education module development. The students working on this project will be part of an interdisciplinary team, and will be cross-trained in the areas of spectroelectrochemistry and material science. These skills will serve them well in their future careers. The proposed educational activities will help enhance the recruitment and retention of minority students and faculties in the Alabama area. The proposal is designed to address both scientific and technical challenges for understanding detailed redox reaction mechanism and plasmon interaction with electrogenerated chemiluminescence (ECL) at single metallic nanoparticles (NPs) using improved spectroelectrochemistry techniques. Task-1 of the proposal involves the study of local electrochemical reaction and its temporal and spatial heterogeneities using ECL at single metallic NPs. Task-2 is designed to resolve the shape dependence of single NPs local electrochemical events with a scanning nanoelectrode probe method that has super-spatial resolution, beyond the optical diffraction limit, and reliable spectral resolution for probing local interfacial charge transfer events.