Surface structure and field emission properties of few-layer graphene flakesстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Thermionic and field electron emissions governed by Richardson–
Dushman and Fowler–Nordheim equations, respectively,
normally coexist under typical experimental conditions.
However, some carbon-based cathodes demonstrate deviations
of temperature dependencies of the current–voltage characteristics
from those predicted by these equations. The nature of
deviations cannot be ascribed to insufficient variations of work
function or surface topology, which result from temperature
variations. In this work, the temperature dependencies of
the electron emission characteristics were experimentally
investigated for the nanographite film cathodes obtained by a
chemical vapor deposition method. It was found that selfconsistent
explanation of the experimental observations of the
thermionic and field electron emissions from the nanocarbon
cathodes may be given by taking into account the temperature
dependence of free carrier density.