In-Situ Transmission Electron Microscopy of the Electrochemical Deposition of Functionalized Poly(thiophenes)

功能化聚噻吩电化学沉积的原位透射电子显微镜

• 批准号: 1505144
• 负责人: David Martin
• 金额: $ 42万
• 依托单位: University of Delaware
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-05-01 至 2018-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1505144&HistoricalAwards=false
• 关键词: Situ; Transmission; Electron; Microscopy; Electrochemical

PART 1: NON-TECHNICAL SUMMARY This project will directly monitor the formation of solid electrically conducted polymers (also known as "synthetic metals") from liquid solutions using a special high-resolution electron microscope which allows direct observation of the cyrstallization process as it takes place. These organic materials are used in many advanced applications including flexible batteries, solar cells, and biomedical devices. However, the way their complicated structures actually form at the molecular level is not well understood scientifically. The project will examine the formation and growth of these complex materials during an electrochemical reaction. The experiments will use a special sample stage that will make it possible to watch and monitor within the electron microscope what happens as the materials change from liquid to solid. The research project will teach students in materials science and engineering how to establish a detailed understanding about the relationship between microstructure and properties of electrically active polymers, as well as contribute to their broader interdisciplinary education. PART 2: TECHNICAL SUMMARY This research project will investigate the electrochemical deposition of functionalized poly(thiophenes) using in-situ transmission electron microscopy (TEM). Conjugated poly(thiophenes), including poly(3,4-ethylenedioxythiophene) (PEDOT) and poly(3,4-propylenedioxythiophene) (PProDOT), are of considerable scientific and commercial interest, but the detailed mechanisms of electrochemical deposition are not yet known. An in-situ sample holder will be used to examine the deposition from liquid monomer solution to solid polymer directly in a TEM. These experiments will make it possible to monitor the oxidative polymerization of thiophene monomers in the region of the electrode-electrolyte interface, providing detailed information about the structural evolution of the resulting polymer films as a function of total charge delivered to the electrode. The results will be correlated with measurements of charge transport properties using impedance spectroscopy and cyclic voltammetry. Correlations will also be made with images obtained by complementary imaging techniques including optical and scanning electron microscopy.

第1部分：非技术摘要该项目将直接监视使用特殊的高分辨率电子显微镜从液体溶液中形成固体导电的聚合物（也称为“合成金属”），该显微镜可以直接观察到发生在发生时的环化过程。 这些有机材料用于许多高级应用中，包括柔性电池，太阳能电池和生物医学设备。 但是，它们的复杂结构在分子水平上实际形成的方式尚未得到科学理解。 该项目将在电化学反应期间检查这些复杂材料的形成和生长。 实验将使用一个特殊的样品阶段，这将使您可以在电子显微镜中观察和监视，因为材料从液体变为固体会发生什么。 该研究项目将教学材料科学和工程学的学生如何建立对微积极聚合物的微观结构与特性之间关系的详细理解，并为其更广泛的跨学科教育做出贡献。 第2部分：技术摘要该研究项目将使用原位传输电子显微镜（TEM）研究功能化聚（硫烯）的电化学沉积。 共轭聚（硫代），包括聚（3,4-乙二基二苯乙烯）（PEDOT）和聚（3,4-丙二甲基二苯乙烯）（PproDot）（PproDot），具有相当大的科学和商业兴趣，但尚不清楚电化学分离的详细机制。 原位样品持有人将用于检查直接在TEM中的液体单体溶液到固体聚合物的沉积。 这些实验将使在电极 - 电解质界面区域中监测硫烯单体的氧化聚合，从而提供有关所得聚合物膜的结构演化的详细信息，这是传递给电极的总电荷的功能。 结果将与使用阻抗光谱和环状伏安法的测量与电荷传输性能的测量相关。 相关性也将与通过包括光学和扫描电子显微镜在内的互补成像技术获得的图像制成。