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Proceedings Paper

Electronic transport properties of incipient graphitic domain formation in PAN-derived carbon nanofibers
Author(s): Wang Yu; Idalia Ramos; Rogerio Furlan; Jorge J Santiago-Aviles
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Paper Abstract

We have measured the electronic transport properties of PAN based nano-fibers obtained by electrostatic deposition from 1.9 K to room temperature and carefully fitted the temperature and magnetic field dependence of these measurements to pertinent theoretical models It is noteworthy that the anomalous temperature and magnetic field dependence of conductivity have been found in carbon fibers with diameter larger than 10 microns, and mostly, carbonized at heat treatment temperature (HTT) higher than 1000°C. It is interesting to evaluate the scaling of such effects that is, if similar effects exist after the diameter is reduced into the nano scale. This paper reports such an attempt after the authors obtained carbon nano-fibers by electro-spinning and measured their electronic transport properties. Single carbon nano-fibers were deposited on silicon oxide coated silicon wafer, and with a lithographed gold contact pattern array. The length and cross-section area of the fibers was measured using an optical microscope and a scanning probe microscope (SPM) operated in tapping mode. Four-probe resistance measurement was conducted continuously 300K down to 1.9K, without any applied magnetic field. Resistance was also measured at 1.9, 3, 5 and 10K when the applied magnetic field, perpendicular to the fiber, increasing and decreasing continuously between -9 and 9 Tesla twice. To suppress the possible heating effect, the total measuring power was limited to 5nW. At all the four investigated temperatures, MR is negative. Its magnitude increase with B and decrease with T. It is noteworthy that MR=-0.75 at T=1.9K and B=9T, the highest MR for such system as far as the authors knowledge.

Paper Details

Date Published: 29 April 2003
PDF: 10 pages
Proc. SPIE 5118, Nanotechnology, (29 April 2003); doi: 10.1117/12.501401
Show Author Affiliations
Wang Yu, Univ. of Pennsylvania (United States)
Idalia Ramos, Univ. de Puerto Rico/Humacao (Puerto Rico)
Rogerio Furlan, Univ. de Puerto Rico/Humacao (Puerto Rico)
Jorge J Santiago-Aviles, Univ. of Pennsylvania (United States)


Published in SPIE Proceedings Vol. 5118:
Nanotechnology
Robert Vajtai; Xavier Aymerich; Laszlo B. Kish; Angel Rubio, Editor(s)

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