Pyrolysis temperature and time dependence of electrical conductivity evolution for electrostatically generated carbon nanofibers

Carbon nanofibers were produced from polyacrylonitrile/N, N-Dimethyl Formamide (PAN/DMF) precursor solution using electrospinning and vacuum pyrolysis at temperatures from 773-1273 K for 0.5, 2, and 5 h, respectively. Their conductance was determined from I-V curves. The length and cross-section are...

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Bibliographic Details
Published in:IEEE transactions on nanotechnology 2003-03, Vol.2 (1), p.39-43
Main Authors: Yu Wang, Santiago-Aviles, J.J., Furlan, R., Ramos, I.
Format: Article
Language:English
Subjects:
Carbon
Carbon fibers
Conductivity measurement
Contacts
Cross-disciplinary physics: materials science
rheology
Electrical conductivity
Electrical resistivity
Exact sciences and technology
Materials science
Nanofibers
Nanoscale materials and structures: fabrication and characterization
Nanotechnology
Optical fiber sensors
Optical microscopy
Physics
Probes
Pyrolysis
Resistivity
Silicon
Temperature dependence
Temperature measurement
Thermal conductivity
Volt-ampere characteristics
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Summary:Carbon nanofibers were produced from polyacrylonitrile/N, N-Dimethyl Formamide (PAN/DMF) precursor solution using electrospinning and vacuum pyrolysis at temperatures from 773-1273 K for 0.5, 2, and 5 h, respectively. Their conductance was determined from I-V curves. The length and cross-section area of the nanofibers were evaluated using optical microscope and scanning probe microscopes, respectively, and were used for their electrical conductivity calculation. It was found that the conductivity increases sharply with the pyrolysis temperature, and increases considerably with pyrolysis time at the lower pyrolysis temperatures of 873, 973, and 1073 K, but varies, less obviously, with pyrolysis time at the higher pyrolysis temperatures of 1173 and 1273 K. This dependence was attributed to the thermally activated transformation of disordered to graphitic carbon.
ISSN:1536-125X
1941-0085
DOI:10.1109/TNANO.2003.808510