Abstract
In this paper, we focus on current–voltage (I–V) characteristics in several kinds of quasi-one-dimensional (quasi-1D) nanofibers to investigate their electronic transport properties covering a wide temperature range from 300 down to 2 K. Since the complex structures composed of ordered conductive regions in series with disordered barriers in conducting polymer nanotubes/wires and CdS nanowires, all measured nonlinearI–Vcharacteristics show temperature and field-dependent features and are well fitted to the extended fluctuation-induced tunneling and thermal excitation model (Kaiser expression). However, we find that there are surprisingly similar deviations emerged between theI–Vdata and fitting curves at the low bias voltages and low temperatures, which can be possibly ascribed to the electron–electron interaction in such quasi-1D systems with inhomogeneous nanostructures.
Highlights
Low-dimensional materials especially nanowires and nanotubes have attracted considerable attention in view of their novel features and electronic device applications in future [1,2,3]
Kaiser et al [11, 12] recently proposed a generic expression (extended fluctuation-induced tunneling (FIT) [13] and thermal excitation model) for the nonlinear I–V characteristics based on numerical calculations for metallic conduction interrupted by small barriers and showed that the expression can give a very good description to the temperature and field-dependent nonlinearities of I–V curves in polyacetylene nanofibers, vanadium pentoxide nanofibers, etc
The electronic density of states (DOS) near the Fermi energy EF is known as an important physical quantity for understanding the electronic transport mechanism in strongly localized systems [14] where the electron–electron interaction (EEI) is first showed with created depletion in DOS near EF by Pollak [15] and Srinivasan [16]
Summary
Low-dimensional materials especially nanowires and nanotubes have attracted considerable attention in view of their novel features and electronic device applications in future [1,2,3]. The I–V characteristics of a series of doped polymer nanofibers and helically twisted CdS nanowire ropes are measured by a standard two-probe method covering a wide temperature range to investigate the transport behavior and figure out this open question We find all these I–V characteristics show similar nonlinear features and are well fitted to Kaiser expression. The nonlinearities at higher temperatures indicate larger barrier energies than that for the polypyrrole nanotube
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