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θΪF Dispersion and Current-Voltage Characteristics of
Helical Polyacetylene Single Fiber
utF Prof. Yung Woo Park@
Chief Scientist of the Nano
Systems Institute National Core Research Center,
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The synthesis and electronic properties of conducting polymer nanowires are the subject of intense interest in recent years due to potential applications in semiconductor nanotechnology. Many of these applications in nano-scale have been limited because of the lack of the method for obtaining one single fiber. The developing of effective dispersion methods is crucial for substantial applications of conducting polymer fibers in the same manner as it was done for single-walled carbon nanotubes. Only the problem of transport in a polymer fiber attracted a significant attention mainly related to polyaniline fibers.
Polyacetylene (PA) is the model conducting polymer showing an extremely high conductivity after doping. Recently, a novel helical PA was introduced by Akagi et al. Since it has planar chiral structures the unique magnetic and optical properties were expected in this material such as molecular solenoid. Despite of the helical structure of chiral bulk film, the solenoidal current without coating with any insulator layer is hardly produced because the helical bulk material is composed of tightly entangled ropes consisting of several fibers. However, on molecular level or nanometer-scale the electric current of doped helical PA single fiber might raise an induced magnetic field. In order to study the properties of a single fiber, it is necessary to extract single helical PA fiber.
Here, we report a new method designed to obtain well-dispersed helical PA single fibers. We use the organic solution with a non-ionic surfactant. Atomic force microscopy (AFM) imaging was performed to monitor the helical fibrillar structures of extracted single fiber, and the current-voltage (I-V) characteristics of iodine doped helical PA single fiber were investigated.
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E-mailFakagi@ims.tsukuba.ac.jp