Yoon Hyeonseok, Hong Jin-Yong, Jang Jyongsik
Hyperstructured Organic Materials Research Center, School of Chemical and Biological Engineering, Seoul National University, Shinlimdong 56-1, Seoul 151-742, Korea.
Small. 2007 Oct;3(10):1774-83. doi: 10.1002/smll.200700245.
The charge-transport behavior in one-dimensional (1D) poly (3,4-ethylenedioxythiophene) (PEDOT) nanomaterials of three different shapes is described. Both intrinsic and extrinsic factors are considered from the viewpoint of a single nanoparticle and nanoparticle assembly. Intrinsically, the oxidation level of the 1D PEDOT nanomaterials becomes higher with increasing aspect ratio of the nanomaterials, which is closely linked to the conjugation length. This result implies that the transport properties of the nanomaterials are significantly dependent on their shape. Extrinsically, the 1D PEDOT nanomaterials make an ohmic contact with gold interdigitated microelectrodes. In addition, a strong correlation is observed between the interparticle contact resistance and the shape of the nanomaterials. Lastly, the intrinsic and extrinsic factors related to charge transport are further illustrated by the resistance changes of nanomaterial-based chemical sensors. As a result, judicious tailoring of the dimensional and geometrical characteristics of the conducting-polymer nanomaterials may enable precise control over their transport properties as well as the characteristics of the nanomaterial-based devices.
描述了三种不同形状的一维（1D）聚（3,4-乙撑二氧噻吩）（PEDOT）纳米材料中的电荷传输行为。从单个纳米颗粒和纳米颗粒组装体的角度考虑了内在因素和外在因素。从本质上讲，一维PEDOT纳米材料的氧化水平随着纳米材料长径比的增加而升高，这与共轭长度密切相关。这一结果表明，纳米材料的传输特性显著依赖于其形状。从外在因素来看，一维PEDOT纳米材料与金叉指微电极形成欧姆接触。此外，观察到颗粒间接触电阻与纳米材料形状之间存在很强的相关性。最后，基于纳米材料的化学传感器的电阻变化进一步说明了与电荷传输相关的内在和外在因素。因此，明智地调整导电聚合物纳米材料的尺寸和几何特征，可能能够精确控制其传输特性以及基于纳米材料的器件的特性。
