Title :
Multishell Carrier Transport in Multiwalled Carbon Nanotubes
Author :
Agrawal, Saurabh ; Raghuveer, Makala S. ; Ramprasad, Rampi ; Ramanath, Ganapathiraman
Author_Institution :
Rensselaer Polytech. Inst., Troy
Abstract :
Understanding carrier transport in carbon nanotubes (CNTs) and their networks is important for harnessing CNTs for device applications. Here, we report multishell carrier transport in individual multiwalled CNTs, and films of randomly dispersed multiwalled CNTs, as a function of electric field and temperature. Electrical measurements and first-principles density functional theory calculations indicate transport across CNT shells. Intershell conduction occurs across an energy barrier range of 60-250 meV in individual CNTs, and ~ 60 meV in CNT networks. In both cases, the conductance behavior can be explained based upon field-enhanced carrier injection and defect-enhanced transport, as described by the Poole-Frenkel model.
Keywords :
Poole-Frenkel effect; ab initio calculations; carbon nanotubes; carrier mobility; charge injection; density functional theory; disperse systems; electrical conductivity; noncrystalline defects; thin films; C; Poole-Frenkel model; defect-enhanced transport; energy barrier; field-enhanced carrier injection; first-principles density functional theory; intershell conduction; multishell carrier transport; multiwalled carbon nanotubes; randomly dispersed multiwalled CNTs films; Carbon Nanotubes; Carbon nanotubes; Electrical Characteristics; Multishell Conduction; electrical characteristics; multishell conduction;
Journal_Title :
Nanotechnology, IEEE Transactions on
DOI :
10.1109/TNANO.2007.907798
