Synthesis and characterization of glassy carbon nanowires

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Abstract

The advent of carbon-based micro-and nanoelectromechanical systems has revived the interest in glassy carbon, whose properties are relatively unknown at lower dimensions. In this paper, electrical conductivity of individual glassy carbon nanowires was measured as a function of microstructure (controlled by heat treatment temperature) and ambient temperature. The semiconducting nanowires with average diameter of 150nm were synthesized from polyfurfuryl alcohol precursors and characterized using transmission electron and Raman microscopy. DC electrical measurements made at 90K to 450K show very strong dependence of temperature, following mixed modes of activation energy and hopping-based conduction. Copyright © 2011 C. M. Lentz et al.

Figures

  • Figure 1: Anodized alumina template-based synthesis of poly-furfuryl alcohol nanowires. The glassy carbon nanowires are obtained by pyrolyzing the polymeric precursor nanowires and then heat treating them at desired temperatures.
  • Figure 2: TEM bright field and diffraction patterns for glassy carbon nanowires treated at (a) 600◦C and (b) 2000◦C showing evolution of graphitic nanostructures.
  • Figure 3: Raman spectra for nanowires heat treated at 600◦C and 2000◦C. The peak sharpening at 2000◦C agrees very well with the TEM analysis.
  • Figure 4: (a) Scanning electron micrograph of a single nanowire manipulated across interdigitated microelectrodes. (b) DC electrical conductivity of a nanowire.
  • Figure 5: Electrical conductivity versus temperature plots for different heat treated specimens.
  • Figure 6: Progressive changes in the trend of conductivity with surface temperature as pyrolysis temperature is increased.
  • Figure 7: Fitting of the low temperature (<250 K) conductivity data to the hopping transport model.
  • Table 1: Parameters from the low temperature DC conductivity data fitted to both a hopping-based energy transport mechanism and a thermally activated conduction mechanism.

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Lentz, C. M., Haque, M. A., Foley, H. C., & Samuel, B. A. (2011). Synthesis and characterization of glassy carbon nanowires. Journal of Nanomaterials, 2011. https://doi.org/10.1155/2011/129298

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