CAREER: Single Particle Visualization of Chemical Processes During Multimetallic Nanocrystal Synthesis

职业：多金属纳米晶体合成过程中化学过程的单粒子可视化

• 批准号: 2045258
• 负责人: Taylor Woehl
• 金额: $ 65.63万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-08-01 至 2026-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2045258&HistoricalAwards=false
• 关键词: CAREER; Single; Particle; Visualization; Chemical

With the support of the Macromolecular, Supramolecular, and Nanochemistry (MSN) Program of the Division of Chemistry at the National Science Foundation, Taylor Woehl at the University of Maryland-College Park will conduct fundamental research on the chemical processes involved in the synthesis of metal nanoparticles, small particles one billionth of a meter in size containing a mixture of different metals. Metal nanoparticles have potential applications as chemical sensors, optical materials, and catalysts in accelerating chemical reactions. A better understanding of the synthetic processes is important for controlling the properties of metal nanoparticles. Students working on this project will gain experience synthesizing and characterizing nanoparticles using state of the art instruments. This CAREER award will support The Nanoscience in Science Fiction (NS2F) program, which will introduce high school students that would not normally seek out extramural STEM (science, technology, engineering and mathematics) activities, including those from under-represented minority groups, to concepts in nanoscience through the window of science fiction. The program aims to improve science literacy of high school students and provide them with positive science role models.In this project, Dr. Taylor Woehl and his team will establish methods to controllably drive solution chemistry with electron beam radiolysis to probe the reaction intermediates formed during solution phase synthesis of multi-metallic nanoparticles from metal thiolate precursors. Correlative liquid phase electron microscopy and mass spectrometry will be used to delineate and visualize molecular and nanoscale reaction intermediates, including metal-ligand complexes, metal nanoclusters, and crystal nuclei, on the single entity scale. Through these experiments, the research team aims to elucidate reaction mechanisms connecting molecular scale (e.g., nanocluster chemistry) and nanoscale chemistry (e.g., crystal nucleation and growth) and to develop new nanocrystal formation theories to account for ‘non-classical’ effects that will enable harnessing reaction intermediates to control the properties of multimetallic nanoparticles.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.

在美国国家科学基金会化学部高分子、超分子和纳米化学（MSN）项目的支持下，马里兰大学帕克分校的泰勒·沃尔（Taylor Woehl）将对金属合成所涉及的化学过程进行基础研究纳米颗粒，十亿分之一米大小的小颗粒，含有不同金属的混合物，具有作为化学传感器、光学材料和加速化学反应的催化剂的潜在应用。了解合成过程对于控制金属纳米颗粒的特性非常重要，从事该项目的学生将获得使用最先进的仪器合成和表征纳米颗粒的经验。该职业奖将支持科幻小说中的纳米科学 (NS2F) 计划。该项目旨在通过科幻小说的窗口向那些通常不会寻求校外 STEM（科学、技术、工程和数学）活动的高中生（包括来自代表性不足的少数群体的学生）介绍纳米科学的概念。提高高中生的科学素养，为他们提供积极的科学榜样。在这个项目中，Taylor Woehl 博士和他的团队将建立通过电子束辐射分解可控驱动溶液化学的方法，以探测溶液相合成过程中形成的反应中间体来自金属硫醇盐前体的多金属纳米颗粒的相关液相电子显微镜和质谱将用于描绘和可视化分子和纳米级反应中间体，包括金属-配体络合物、金属。通过这些实验，研究小组旨在阐明连接分子尺度（例如纳米团簇化学）和纳米尺度化学（例如晶体成核和生长）的反应机制，并开发新的纳米晶体形成。解释“非经典”效应的理论，这些效应将能够利用反应中间体反射来控制多金属纳米粒子的性能。该奖项是 NSF 的法定使命，并被视为值得通过使用基金会的智力优点和更广泛的影响审查标准进行评估来支持。

项目成果

Noble Metal Ion‐Directed Assembly of 2D Materials for Heterostructured Catalysts and Metallic Micro‐Texturing

• DOI: 10.1002/adfm.202215222
• 发表时间: 2023-05
• 期刊: Advanced Functional Materials
• 影响因子: 19
• 作者: Joshua M. Little;Jia-yue Sun;A. Kamali;Amy Chen;A. Leff;Yang Li;Leah K. Borden;T. Dissanayake;Deborah Essumang;Benita O. Oseleononmen;Dongxia Liu;T. Woehl;Po‐Yen Chen

Real-time imaging of metallic supraparticle assembly during nanoparticle synthesis

纳米粒子合成过程中金属超粒子组装体的实时成像

• DOI: 10.1039/d1nr05416c
• 发表时间: 2022
• 期刊: Nanoscale
• 影响因子: 6.7
• 作者: Wang, Mei;Park, Chiwoo;Woehl, Taylor J.
• 通讯作者: Woehl, Taylor J.