Charge transfer between carbon nanotubes on surfaces.
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2015
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The charge transfer between neighboring single-walled carbon
nanotubes (SWNTs) on a silicon oxide surface was investigated as a
function of both the SWNT nature (metallic or semiconducting)
and the anode/cathode distance using scanning probe techniques.
Two main mechanisms were observed: a direct electron tunneling
described by the typical Fowler–Nordheim model, and indirect
electron transfer (hopping) mediated by functional groups on the
supporting surface. Both mechanisms depend on the SWNT nature
and on the anode/cathode separation: direct electron tunneling
dominates the charge transfer process for metallic SWNTs,
especially for large distances, while both mechanisms compete
with each other for semiconducting SWNTs, prevailing one over
the other depending on the anode/cathode separation. These
mechanisms may significantly influence the design and operation
of SWNT-based electronic devices.
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ARAUJO, K. A. de S. et al. Charge transfer between carbon nanotubes on surfaces. Nanoscale, v. 7, p. 16175-16181, 2015. Disponível em: <https://pubs.rsc.org/en/content/articlelanding/2015/nr/c5nr03547c#!divAbstract>. Acesso em: 16 jan. 2018.