Electronic transport through crossed conducting polymer nanowires
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Jean-Luc Duvail Institut des Mate´riaux Jean Rouxel (IMN), Universite´ de Nantes, 44322 Nantes, CNRS, France
Qing-Tao Wang and Meng-Meng Li College of Physics Science, Qingdao University, Qingdao 266071, People’s Republic of China
Chang-Zhi Gu Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China (Received 11 November 2008; accepted 22 January 2009)
In order to study the electronic properties of conjugated polymer nanowire junctions, we have fabricated two devices consisting of two crossed poly(3,4-ethylenedioxythiophene) (PEDOT) nanowires with platinum microleads attached to each end of each nanowire. We find that the junction resistance of the crossed nanowires is much larger than the intrinsic resistance of the individual PEDOT nanowire, and increases with decreasing temperature, which can be described by a thermal fluctuation-induced tunneling conduction model. In addition, the crossed junctions show linear current-voltage characteristics at room temperature. I. INTRODUCTION
Conjugated polymers, especially as nanowires and nanotubes, are very promising materials for future applications in nanoscale and molecular electronics. This is due to the materials’ adjustable conductivity ranging from 1010 to 104 O–1cm1, quasi-one-dimensionality, and good processability. In the past 10 years, there has been intense investigation of the electronic transport properties of nanoscale devices based on individual nanotubes and nanowires made of conjugated polymers such as polyacetylene, polyaniline, polypyrrole, poly (3,4-ethylenedioxythiophene) (PEDOT), and others.1–10 For instance, a single polymer nanofiber field-effect transistor1,4 and polypyrrole nanofiber array devices as switching diode and nano-rectifiers5 have been reported. The use of individual polypyrrole microwires/nanowires as pH sensors6 and polyaniline nanofibers as NH3 sensors7 has been demonstrated. Besides individual polymer nanofiber devices, self-assembled nanotube junctions and dendrites of conducting polyaniline and polypyrrole were also reported.9 Long et al.10 found that the intrinsic resistance of an individual polyaniline nanotube (30 kO) is much smaller than the contact resistance of crossed polyaniline nanotubes (500 kO). However, among these numerous publications, only a few papers cover threeterminal nanoscale junctions of conjugated polymer nanotubes/nanowires, which may offer an advanced pathway a)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/JMR.2009.0371
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http://journals.cambridge.org
J. Mater. Res., Vol. 24, No. 10, Oct 2009 Downloaded: 02 Apr 2015
toward nanoelectronics. For carbon nanotubes, it has been reported that crossed carbon nanotubes11 and carbon nanotube Y-junctions12,13 are excellent candidates to develop three-terminal nanoelectronic devices. PEDOT, a promising conducting polymer with excellent electrical and optical properties, has drawn intensive interest in recent years. PEDOT nanotubes and nanowires can be prepared by different methods
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