Field Emission Spectroscopy Evidence for Dual-Barrier Electron Tunnelling in Nanographiteстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 11 августа 2015 г.
Аннотация:Nanocarbon films with upstanding flake-like graphite crystallites of nanometre thickness were fabricated
by carbon condensation from a methane–hydrogen gas mixture activated by a direct-current
discharge. The nanographite (NG) crystallites are composed of a few graphene layers. The adjacent
atomic layers are connected partially at the edges of the crystallites to form strongly curved graphene
structures. The extraordinary field emission (FE) properties were revealed for the NG films with an
average current density of a few mA/cm2, reproducibly obtained at a macroscopic applied field of
about 1V/lm. The integral FE current–voltage curves and electron spectra (FEES) of NG cathodes
with multiple emitters were measured in a triode configuration. Most remarkably, above a threshold
field, two peaks were revealed in FEES with different field-dependent shifts to lower energies. This
behaviour evidences electron emission through a dual potential barrier, corresponding to carbon–carbon
heterostructure formed as a result of the graphene bending.