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Chin. Phys. B, 2009, Vol. 18(6): 02514    DOI: 10.1088/1674-1056/18/6/066

Current-voltage characteristics of individual conducting polymer nanotubes and nanowires

Long Yun-Zea, Yin Zhi-Huaa, Li Meng-Menga, Duvail Jean-Lucb, Wan Mei-Xiangc, Gu Chang-Zhid, Jin Ai-Zid
a College of Physics Science, Qingdao University, Qingdao 266071, China; b Institut des Mat '{eriaux Jean Rouxel, Universit '{e de Nantes, 44322 Nantes, CNRS, France; c Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; d Institute of Physics, 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.
Keywords:  nanotubes/wires      conducting polymers      I--V curves  
Received:  10 October 2008      Revised:  04 December 2008      Published:  20 June 2009
PACS:  73.63.Fg (Nanotubes)  
  66.70.-f (Nonelectronic thermal conduction and heat-pulse propagation in solids;thermal waves)  
  73.20.At (Surface states, band structure, electron density of states)  
  73.22.-f (Electronic structure of nanoscale materials and related systems)  
  73.23.Hk (Coulomb blockade; single-electron tunneling)  
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, Yin Zhi-Hua, Li Meng-Meng, Gu Chang-Zhi, Duvail Jean-Luc, Jin Ai-Zi, Wan Mei-Xiang Current-voltage characteristics of individual conducting polymer nanotubes and nanowires 2009 Chin. Phys. B 18 02514

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