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Ionic transport properties of template-synthesized gold nanotube membranes.

机译：模板合成的金纳米管膜的离子传输性能。

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摘要

Ionic transport in nanotubes exhibits unique properties due to the strong interactions between ions and the nanotube surface. The main objective of my research is to explore and regulate the ionic transport in gold nanotube membranes.;Chapter 1 overviews a versatile method of fabricating nanostructured materials, called the template synthesis. Important parameters of the template synthesis are introduced such as templates and deposition methods. The template synthesis method is used to prepare membranes used in this dissertation.;Chapter 2 describes a method to increase the ionic conductivity in membranes containing gold nanotubes with small diameter (4 nm). The gold nanotube membrane is prepared by the electroless plating of gold in a commercially available polycarbonate membrane. Voltages are applied to the gold nanotube membrane and fixed charges are injected on the gold nanotube walls. We show that ionic conductivity of the gold nanotube membrane can be enhanced in aqueous potassium chloride (KCl) solution at negative applied voltages. When the most negative voltage (-0.8 V vs. Ag/AgCl) is applied to the membrane, the ionic conductivity of the solution inside the gold nanotube (94 mS.cm-1) is comparable to that of 1 M aqueous KCl, over two orders of magnitude higher than that of the 0.01 M KCl contacting the membrane.;Chapter 3 explores another important transport property of the gold nanotube membrane -- ion permselectivity. When the permselective membrane separates two electrolyte solutions at different concentrations, a membrane potential is developed and measured by the potentiometric method. Surface charge density and the ion mobilities are estimated by fitting the experimental data with a pre-existing model. The surface charge density of the gold nanotube membrane in this research is estimated to be 2 muC/cm2.;Chapter 4 describes voltage-controlled ionic transport in a gold/polypyrrole membrane doped with sodium dodecylbenzene sulfonate (DBS). Polypyrrole (PPy) films doped with DBS are electropolymerized on both sides of a polycarbonate membrane template. The gold/PPy membrane is oxidized at 0.6 V (vs. Ag/AgCl) and reduced at -0.7 V. We show that the gold/PPy (DBS) membrane can be switched between dielectric-film characteristics in oxidized form and a high conductance state in reduced form.
机译：由于离子与纳米管表面之间的强相互作用，纳米管中的离子输运具有独特的性能。我研究的主要目的是探索和调节金纳米管膜中的离子迁移。第1章概述了一种制备纳米结构材料的通用方法，称为模板合成。介绍了模板合成的重要参数，例如模板和沉积方法。本文采用模板合成的方法制备膜。第二章介绍了一种提高包含小直径（4nm）金纳米管的膜中离子电导率的方法。通过在可商购的聚碳酸酯膜中化学镀金来制备金纳米管膜。将电压施加到金纳米管膜上，并在金纳米管壁上注入固定电荷。我们表明，在负电压下，在氯化钾水溶液（KCl）中可以提高金纳米管膜的离子电导率。当将最大负电压（-0.8 V vs. Ag / AgCl）施加到膜上时，金纳米管内部溶液的离子电导率（94 mS.cm-1）与1 M KCl水溶液的电导率相当。比接触该膜的0.01 M KCl高两个数量级。;第三章探讨了金纳米管膜的另一重要传输性质-离子渗透选择性。当渗透选择性膜将两种电解质溶液以不同的浓度分开时，膜电位会升高，并通过电位法进行测量。通过将实验数据与预先存在的模型进行拟合，可以估算表面电荷密度和离子迁移率。本研究中金纳米管膜的表面电荷密度估计为2μC/ cm2。;第4章介绍了十二烷基苯磺酸钠（DBS）掺杂的金/聚吡咯膜中的电压控制离子迁移。掺杂有DBS的聚吡咯（PPy）膜在聚碳酸酯膜模板的两侧进行电聚合。金/ PPy膜在0.6 V（vs. Ag / AgCl）时被氧化，并在-0.7 V时被还原。我们表明，金/ PPy（DBS）膜可以在氧化形式的介电膜特性和高电导率之间切换以简化形式陈述。

著录项

  • 作者

    Gao, Peng.;

  • 作者单位

    University of Florida.;

  • 授予单位 University of Florida.;
  • 学科 Analytical chemistry.;Nanotechnology.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 121 p.
  • 总页数 121
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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