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.

在国家科学基金会化学部的大分子，超分子和纳米化学（MSN）计划的支持下，马里兰大学帕克分校的Taylor Woehl将对金属纳米颗粒合成中涉及的化学过程进行基础研究，这些纳米颗粒是十亿分之一米大小的小颗粒，含有不同金属的混合物。金属纳米粒子在化学传感器、光学材料、化学催化剂等方面具有潜在的应用前景。 更好地理解合成过程对于控制金属纳米颗粒的性质是重要的。 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粒子的经验。该职业奖将支持科幻小说中的纳米科学（NS2F）计划，该计划将向高中生介绍通常不会寻求校外STEM（科学，技术，工程和数学）活动，包括那些代表性不足的少数群体，通过科幻小说的窗口了解纳米科学的概念。该项目旨在提高高中生的科学素养，并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可控地驱动溶液化学的方法，利用电子束辐解来探测由金属硫醇盐前体溶液相合成多金属纳米颗粒过程中形成的反应中间体。相关的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，金属纳米团簇和晶核，在单一实体规模。通过这些实验，研究小组旨在阐明连接分子尺度的反应机制（例如，纳米团簇化学）和纳米级化学（例如，晶体成核和生长），并开发新的结晶形成理论，以解释“非经典”效应，从而能够利用反应中间体来控制多金属纳米颗粒的性质。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

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.