Electrical Conductivity and Current--Voltage Characteristics of Individual Conducting Polymer PEDOT Nanowires
LONG Yun-Ze1, DUVAIL Jean-Luc2, CHEN Zhao-Jia3, JIN Ai-Zi3, GU Chang-Zhi3
1College of Physics Science, Qingdao University, Qingdao 2660712Institut des Matériaux Jean Rouxel, Université de Nantes, CNRS, 44322 Nantes, France3Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
Electrical Conductivity and Current--Voltage Characteristics of Individual Conducting Polymer PEDOT Nanowires
LONG Yun-Ze1, DUVAIL Jean-Luc2, CHEN Zhao-Jia3, JIN Ai-Zi3, GU Chang-Zhi3
1College of Physics Science, Qingdao University, Qingdao 2660712Institut des Matériaux Jean Rouxel, Université de Nantes, CNRS, 44322 Nantes, France3Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
摘要We report the current--voltage (I-V) characteristics and electrical conductivity of individual template-synthesized poly(3,4-ethylenedioxythiophene) (PEDOT) nanowires (190±6 nm in diameter and σRT= 11.2±2,Ω-1cm-1) over a wide temperature range from 300 to 10K. With lowering temperature, the I-V characteristics become nonlinear around 50K, and a clear Coulomb gap-like structure appears in the differential conductance (dI/dV) spectra. The temperature dependence of the resistance below 70K follows ln R ∝ T1/2, which can be interpreted as Efros--Shklovskii hopping conduction in the presence of a Coulomb gap. In addition, the influences of measurement methods such as the applied bias voltage magnitude, the two-probe and four-probe techniques used in the resistance measurements are also reported and discussed.
Abstract：We report the current--voltage (I-V) characteristics and electrical conductivity of individual template-synthesized poly(3,4-ethylenedioxythiophene) (PEDOT) nanowires (190±6 nm in diameter and σRT= 11.2±2,Ω-1cm-1) over a wide temperature range from 300 to 10K. With lowering temperature, the I-V characteristics become nonlinear around 50K, and a clear Coulomb gap-like structure appears in the differential conductance (dI/dV) spectra. The temperature dependence of the resistance below 70K follows ln R ∝ T1/2, which can be interpreted as Efros--Shklovskii hopping conduction in the presence of a Coulomb gap. In addition, the influences of measurement methods such as the applied bias voltage magnitude, the two-probe and four-probe techniques used in the resistance measurements are also reported and discussed.
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2008, Vol. 25 
