Current-voltage nanofiber

A novel route to pure and composite fibers of polypyrrole was recently reported by Han and Shi [42]. An organic salt (FeAOT) was synthesized by the reaction of sodium l,4-bis(2-ethyUiexyl)sulfosuccinate (AOT) and ferric chloride. It was fabricated into nanofibers by manual drawing and electrospinning. Long PPy fibers were obtained for the first time by a vapor deposition reaction of pyrrole on the FeAOT fibers, and this technique was extended to the synthesis of PPy composite fibers with multiwalled carbon nanotubes (PPy-MWCNT fibers). The PPy and PPy-MWCNT fibers had a nanoporous morphology, a conductivity of 10-15 S cm and a tensile strength of 12—43 MPa. Studies of the electrochemistry and current-voltage characteristics of the PPy fibers were also reported. 

Figure 10.43 Current-voltage characteristics of individual polyacetylene nanofibers. (Reprinted with permission from Synthetic Metals, Current-voltage characteristics of conducting polymers and carbon nanotubes by A. B. Kaiser and Y. W. Park, 152, 1-3. Copyright (2005)...

Figure 4. (a) Current-voltage curve for a single 50 wt% HCSA-PANI/PEO nanofiber. (b) Temperature-dependence of the conductivity for a single 72wt% HCSA-PANI/PEO nanofiber (4). 

Current-voltage characteristics at 300 K of a PAN/PEO nanofiber diode. The two curves (squares and circles, respectively) are obtained by inverting the polarization of the applied bias. Inset Semilog plot of the forward bias current v. forward bias voltage for the case when the positive terminal of the apphed bias is connected to an Au electrode in contact with the nanofiber. The linear behavior at low voltage bias values is described by Equation (6.5). Reproduced with permission from Ref. 97, Appl. Phys. Lett., 2006, 89, 033505. Doi 10.1063/1.2227758. Copyright 2006, American Institute of Physics. 

Fig. 27 a Nanofibers composed of Cu prepared via the precursor route and b single fiber current/voltage characteristics [118]... 

Electrospinning based on the application of a static electric field on a polymer solution or melt through a spinneret appears to be a simple and well-controllable technique able to produce polymeric nanofibers. A typical experimental setup is based on a capillary injection tip, a high-voltage source able to apply electric fields of 100-500 KVm , and a metallic collector, or counter electrode. Electric current in electrospinning experiments is usually in the order of a few milliamperes. ... 

Graphitic nanofibers with herringbone structure (for description and preparation method see [279]) were also employed as supports for PtRu (1 1) [280]. The total metal eontent was 42 wt% and the catalyst particle size was 6 nm. DMFC polarization experiments showed an approximately 50% improvement in superficial current density at constant cell voltage for the supported vs. unsupported catalyst over the entire polarization curve [280]. 

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