Abstract
The electronic and transport properties of the molecular devices of finite-sized carbon nanotubes (CNTs) have been studied by combining the density-functional theory and Green's function method. Different edge-passivated types are considered for the edge carbon atoms at the two open ends. It is shown that the electronic and transport properties of the finite-size CNTs are sensitive to the passivation types of edge atoms. An asymmetry passivation method which can tune the spin density of states of CNTs has been proposed. The electron transmission can be manipulated by modifying the CNTs, such as edge passivation types and concentrations.
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