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Metal-conductive polymer hybrid nanostructures: preparation and electrical properties of palladium-polyimidazole nanowires

机译：金属导电聚合物杂化纳米结构：钯-聚咪唑纳米线的制备和电性能

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摘要

A simple, convenient method for the formation of hybrid metal/conductive polymer nanostructures is described. Polyimidazole (PIm) has been templated on lambda-DNA via oxidative polymerisation of imidazole using FeCl3 to produce conductive PIm/DNA nanowires. The PIm/DNA nanowires were decorated with Pd (Pd/PIm/DNA) by electroless reduction of PdCl42- with NaBH4 in the presence of PIm/DNA; the choice of imidazole was motivated by the potential Pd(II) binding site at the pyridinic N atom. The formation of PIm/DNA and the presence of metallic Pd on Pd/PIm/DNA nanowires were verified by FTIR, UV-vis and XPS spectroscopy techniques. AFM studies show that the nanowires have diameters in the range 5-45 nm with a slightly greater mean diameter (17.1 +/- 0.75 nm) for the Pd-decorated nanowires than the PIm/DNA nanowires (14.5 +/- 0.89 nm). After incubation for 24 h in the polymerisation solution, the PIm/DNA nanowires show a smooth, uniform morphology, which is retained after decoration with Pd. Using a combination of scanned conductance microscopy, conductive AFM and two-terminal measurements we show that both types of nanowire are conductive and that it is possible to discriminate different possible mechanisms of transport. The conductivity of the Pd/PIm/DNA nanowires, (0.1-1.4 S cm(-1)), is comparable to the PIm/DNA nanowires (0.37 +/- 0.029 S cm(-1)). In addition, the conductance of Pd/PIm/DNA nanowires exhibits Arrhenius behaviour (E-a = 0.43 +/- 0.02 eV) as a function of temperature in contrast to simple Pd/DNA nanowires. These results indicate that although the Pd crystallites on Pd/PIm/DNA nanowires decorate the PIm polymer, the major current pathway is through the polymer rather than the Pd.
机译：描述了一种用于形成杂化金属/导电聚合物纳米结构的简单方便的方法。聚咪唑（PIm）已​​通过使用FeCl3的咪唑氧化聚合在lambda-DNA上进行模板化，以生产导电PIm / DNA纳米线。通过在PIm / DNA的存在下用NaBH4化学还原PdCl42-，用Pd（Pd / PIm / DNA）装饰PIm / DNA纳米线;咪唑N原子上潜在的Pd（II）结合位点推动了咪唑的选择。通过FTIR，UV-vis和XPS光谱技术验证了PIm / DNA的形成以及Pd / PIm / DNA纳米线上金属Pd的存在。 AFM研究表明，纳米线的直径在5-45 nm范围内，Pd修饰的纳米线的平均直径（17.1 +/- 0.75 nm）比PIm / DNA纳米线（14.5 +/- 0.89 nm）稍大。在聚合溶液中孵育24小时后，PIm / DNA纳米线显示出​​光滑均匀的形态，并在用Pd装饰后得以保留。结合使用扫描电导显微镜，导电原子力显微镜和两端测量，我们表明两种类型的纳米线都是导电的，并且有可能区分不同的可能的传输机制。 Pd / PIm / DNA纳米线（0.1-1.4 S cm（-1））的电导率可与PIm / DNA纳米线（0.37 +/- 0.029 S cm（-1））相媲美。此外，与简单的Pd / DNA纳米线相比，Pd / PIm / DNA纳米线的电导随温度表现出Arrhenius行为（E-a = 0.43 +/- 0.02 eV）。这些结果表明，尽管Pd / PIm / DNA纳米线上的Pd微晶装饰了PIm聚合物，但主要的电流途径是通过聚合物而不是Pd。

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