Open Access Nano Express

Current–Voltage Characteristics in Individual Polypyrrole Nanotube, Poly(3,4-ethylenedioxythiophene) Nanowire, Polyaniline Nanotube, and CdS Nanorope

Zhi-Hua Yin1, Yun-Ze Long1*, Chang-Zhi Gu2, Mei-Xiang Wan3 and Jean-Luc Duvail4

Author Affiliations

1 College of Physics Science, Qingdao University, Qingdao, 266071, China

2 Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China

3 Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China

4 Institut des Matériaux Jean Rouxel, Université de Nantes, CNRS, Nantes, 44322, France

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Nanoscale Research Letters 2008, 4:63-69  doi:10.1007/s11671-008-9203-8

Published: 20 November 2008

Abstract

In this paper, we focus on current–voltage (I–V) characteristics in several kinds of quasi-one-dimensional (quasi-1D) nanofibers to investigate their electronic transport properties covering a wide temperature range from 300 down to 2 K. Since the complex structures composed of ordered conductive regions in series with disordered barriers in conducting polymer nanotubes/wires and CdS nanowires, all measured nonlinearI–Vcharacteristics show temperature and field-dependent features and are well fitted to the extended fluctuation-induced tunneling and thermal excitation model (Kaiser expression). However, we find that there are surprisingly similar deviations emerged between theI–Vdata and fitting curves at the low bias voltages and low temperatures, which can be possibly ascribed to the electron–electron interaction in such quasi-1D systems with inhomogeneous nanostructures.

Keywords:
Conducting polymers; I–Vcharacteristics; FIT model; Nanowires/tubes