Current-voltage characteristics of individual conducting polymer nanotubes and nanowires
Long Yun-Ze(龙云泽)a)†, Yin Zhi-Hua(尹志华)a), Li Meng-Meng(李蒙蒙)a), Gu Chang-Zhi(顾长志)b), Duvail Jean-Lucc), Jin Ai-Zi(金爱子)b), and Wan Mei-Xiang(万梅香)d)
a College of Physics Science, Qingdao University, Qingdao 266071, China; bInstitute of Physics, Chinese Academy of Sciences, Beijing 100190, China; cInstitut des Matériaux Jean Rouxel, Université de Nantes, 44322 Nantes, CNRS, France; dInstitute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Abstract We report the current-voltage (I--V) characteristics of individual polypyrrole nanotubes and poly(3,4-ethylenedioxythiophene) (PEDOT) nanowires in a temperature range from 300 K to 2 K. Considering the complex structures of such quasi-one-dimensional systems with an array of ordered conductive regions separated by disordered barriers, we use the extended fluctuation-induced tunneling (FIT) and thermal excitation model (Kaiser expression) to fit the temperature and electric-field dependent I--V curves. It is found that the I--V data measured at higher temperatures or higher voltages can be well fitted by the Kaiser expression. However, the low-temperature data around the zero bias clearly deviate from those obtained from this model. The deviation (or zero-bias conductance suppression) could be possibly ascribed to the occurrence of the Coulomb-gap in the density of states near the Femi level and/or the enhancement of electron-electron interaction resulting from nanosize effects, which have been revealed in the previous studies on low-temperature electronic transport in conducting polymer films, pellets and nanostructures. In addition, similar I--V characteristics and deviation are also observed in an isolated K0.27MnO2 nanowire.
Received: 10 October 2008
Revised: 04 December 2008
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 10604038) and the
Program for New Century Excellent Talents in University of China
(Grant No NCET-07-0472).
Cite this article:
Long Yun-Ze(龙云泽), Yin Zhi-Hua(尹志华), Li Meng-Meng(李蒙蒙), Gu Chang-Zhi(顾长志), Duvail Jean-Luc, Jin Ai-Zi(金爱子), and Wan Mei-Xiang(万梅香) Current-voltage characteristics of individual conducting polymer nanotubes and nanowires 2009 Chin. Phys. B 18 2514
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