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  Journal of Nanoscience Letters 2014, 4: 4
  Research Article
 
Current-voltage characteristics of individual conducting polypyrrole nanotubes: Space-charge-limited current and Coulomb blockade
  Gui-Feng Yua,b, Yun-Ze Longa,c,d, Hong-Di Zhanga,c, Bin Suna,e, Da-Peng Lina  
     
a College of Physics, Qingdao University, Qingdao 266071, China
b College of Science & Information, Qingdao Agricultural University, Qingdao 266109, China
c Key Laboratory of Photonics Materials & Technology in Universities of Shandong (Qingdao University), Qingdao 266071, China
d State Key Laboratory Cultivation Base of New Fiber Materials & Modern Textile, Qingdao University, Qingdao 266071, China
e College of Chemistry, Chemical Engineering & Environment, Qingdao University, Qingdao 266071, China

   
  Abstract  
  Current-voltage (I-V) characteristics of individual conducting polypyrrole nanotubes are studied covering a wide temperature range from 300 down to 10 K. With lowering temperature, a transition from linear to nonlinear I-V curves is observed. Space-charge-limited current (SCLC) theory and Coulomb blockade model are used to fit the temperature and electric-field dependent I-V curves. It is found that the I-V data measured at higher temperatures can be well fitted by the SCLC theory, and the corresponding transition voltage, carrier density and trap concentration are also calculated based on the SCLC theory. However, the low-temperature I-V data (<30 K) cannot be interpreted by this theory. The differential conductance (dI/dV) curves below 30 K show Coulomb gap-like structure around zero bias, which is possibly due to enhanced electron-electron interaction at low temperatures.
     
  Keywords  
  Conducting polymers; Polypyrrole; SCLC; I-V curve; Coulomb blockade  
     
   
   
   
   
     

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