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Imaging and spectroscopy of conducting polymer-fullerene composite materials.

机译：导电聚合物-富勒烯复合材料的成像和光谱学。

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Since the development and optical study of conjugated (conducting) polymers it has become apparent that chain conformation and aggregation at the molecular scale result in complex heterogeneous nanostructured bulk materials for which a detailed insight into morphological, spectroscopic as well as optoelectronic properties and mechanisms is overwhelmingly difficult to obtain. Nanoparticles composed of the conjugated polymer poly[2-methoxy-5-(2-ethylhexyl-oxy)-p-phenylenevinylene] (MEH-PPV) and nanocomposite nanoparticles consisting of MEH-PPV doped with 1-(3-methoxycarbonylpropyl)-1-phenyl-[6.6]C61 (PCBM) were prepared as model systems to study these materials at the length scale of one to a few domains. The MEH-PPV and PCBM doped nanoparticles were analyzed by single imaging/particle spectroscopy (SPS) and revealed molecular scale information on the structure-property relationships of these composite materials. The data obtained from SPS were investigated in terms of spectral difference between doped and undoped nanoparticles. The doped nanoparticles are blue shifted by approximately 5-10 nm, have an additional blue shoulder, and show different vibronic structure than the undoped nanoparticles. Specifically, relative intensity of the 0-1 transition is lower than for the undoped nanoparticles. These data are indicative of differences in molecular order between both nanoparticle systems, detected at the molecular scale. In addition, the effect of electrical fields present in devices on the interfacial charge transfer properties was evaluated. Furthermore, these nanoparticles were incorporated into the lipid nanotubes to study the diffusion process of the single MEH-PPV nanoparticles inside the lipid nanotubes. Our data shows a clear proof of concept that diffusion of nanoparticles inside the hollow lipid nanotubes can be studied on a single particle basis, which will allow us to study diffusion processes quantitatively and mechanistically within the framework of developing a biocompatible drug and gene delivery platform.
机译：自从共轭（导电）聚合物的开发和光学研究以来，很明显的是，分子规模的链构象和聚集导致了复杂的异质纳米结构体材料，其对形态学，光谱学以及光电特性和机理的详细了解很难获得。由共轭聚合物聚[2-甲氧基-5-（2-乙基己基-氧基）-对亚苯基亚乙烯基]（MEH-PPV）组成的纳米颗粒和由掺有1-（3-甲氧基羰基丙基）-1的MEH-PPV组成的纳米复合纳米颗粒制备了苯基-[6.6] C61（PCBM）作为模型系统，以一到几个域的长度尺度研究了这些材料。 MEH-PPV和PCBM掺杂的纳米粒子通过单次成像/粒子光谱（SPS）分析，并揭示了有关这些复合材料的结构性质关系的分子尺度信息。根据掺杂和未掺杂纳米粒子之间的光谱差异，研究了从SPS获得的数据。掺杂的纳米粒子蓝移了大约5-10 nm，具有一个额外的蓝肩，并且显示出与未掺杂的纳米粒子不同的振子结构。具体地，0-1过渡的相对强度低于未掺杂纳米颗粒的相对强度。这些数据表明在分子规模上检测到的两个纳米颗粒系统之间的分子顺序差异。此外，评估了设备中存在的电场对界面电荷转移性质的影响。此外，将这些纳米颗粒掺入脂质纳米管中以研究单个MEH-PPV纳米颗粒在脂质纳米管内部的扩散过程。我们的数据显示了一个清晰的概念证明，即可以在单个颗粒的基础上研究中空脂质纳米管内部纳米颗粒的扩散，这将使我们能够在开发生物相容性药物和基因传递平台的框架内定量和机械地研究扩散过程。

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  • 作者

    Tenery, Daeri.;

  • 作者单位

    University of Central Florida.;

  • 授予单位 University of Central Florida.;
  • 学科 Chemistry Physical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 168 p.
  • 总页数 168
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:38:19

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