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Size related transport mechanisms in hybrid metal–polymer nanowires
Author(s) -
Gence L.,
Callegari V.,
Faniel S.,
Vlad A.,
Dutu C.,
Melinte S.,
DemoustierChampagne S.,
Bayot V.
Publication year - 2008
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200778139
Subject(s) - nanowire , variable range hopping , materials science , polycarbonate , metal , plateau (mathematics) , condensed matter physics , polymer , nanotechnology , thermal conduction , atmospheric temperature range , composite material , thermodynamics , physics , mathematical analysis , mathematics , metallurgy
Electrical transport data for hybrid metal‐polypyrrole nanowires of various diameters are presented and analyzed. Measurements were performed on both multiple nanowires – embedded within polycarbonate templates – and single nanowires down to low temperature T = 4 K. All samples exhibit symmetrical and linear current–voltage ( I – V ) characteristics at room temperature. Below 77 K, all samples with diameters above 40 nm present nonlinear I–V characteristics and a zero‐current plateau at 4 K. The three‐dimensional Mott variable‐range‐hopping model provides a complete framework for the understanding of their behavior. In contrast, the transport mechanism changes for the 40 nm nanowire samples which exhibit a power‐law T ‐dependence of the resistance, indicative of the critical regime of disorder‐induced metal‐insulator transitions. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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