In:
Applied Physics Letters, AIP Publishing, Vol. 89, No. 15 ( 2006-10-09)
Abstract:
Regular microcoiled carbon fibers with a double helix structure have been synthesized by the catalytic pyrolysis of acetylene at 750–790°C using Ni powder as a catalyst and thiophene as a promotor. The measurements by a standard four-probe technique of resistance, I-V curves, and magnetoresistance of a single microcoiled fiber are presented. I-V curves and the temperature dependence of the resistance are in accordance with Mott-David [Electronic Processes in Noncrystalline Materials (Oxford University Press, Oxford, 1979), 2nd ed., p. 32] variable range hopping above 13K and Shklovskii-Efros [Electronic Properites of Doped Semiconductors (Spring er, Berlin, 1984), p. 202]; Pollak-Shklovshii [Hopping Transport in Solids, (North-Holland, Amsterdam, 1991), 273] variable range hopping below 13K. In addition, a positive magnetoresistance with H2-dependence behavior is observed at low temperature.
Type of Medium:
Online Resource
ISSN:
0003-6951
,
1077-3118
Language:
English
Publisher:
AIP Publishing
Publication Date:
2006
detail.hit.zdb_id:
211245-0
detail.hit.zdb_id:
1469436-0
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