Nanojunctions in conducting polypyrrole single nanowire made by focused electron beam: Charge transport characteristics
- Department of Physics, Korea University, Seoul 136-713 (Korea, Republic of)
A focused electron (E)-beam with various doses was irradiated on the intended positions of conducting polypyrrole (PPy) single nanowire (NW) to fabricate nanojunctions. The current-voltage characteristics and their temperature dependence of the PPy single NW with nanojunctions were measured and analyzed. By increasing the E-beam dose and the number of nanojunctions, the current level of the single NW was dramatically decreased, and the conductance gap became more severe as the temperature decreased. The charge transport behavior varied from three-dimensional variable range hopping to fluctuation induced tunneling models, depending on the dose of focused E-beam. From micro-Raman spectra, the focused E-beam irradiation induced the de-doped states and conformational modification of polymer chains in the nanojunctions. The results suggest that the nanojunctions made by focused E-beam acted as a quasi-potential barrier for charge conduction in the conducting PPy single NW.
- OSTI ID:
- 22036667
- Journal Information:
- Journal of Applied Physics, Vol. 110, Issue 2; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
CHARGE TRANSPORT
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRON BEAMS
ELECTRONS
FLUCTUATIONS
IRRADIATION
ORGANIC POLYMERS
PHYSICAL RADIATION EFFECTS
POLYMERS
PYRROLES
QUANTUM WIRES
RAMAN SPECTRA
TEMPERATURE DEPENDENCE
THREE-DIMENSIONAL CALCULATIONS
TUNNEL EFFECT