Negative differential resistance in oxidized zigzag graphene nanoribbons

Abstract

A theoretical study of zigzag graphene nanoribbons (ZGNRs) with an epoxy-pair chain (ZGO) is performed. The electronic transport properties are mainly evaluated by non-equilibrium Green's functions using the TRANSIESTA package. The results indicate that the graphene oxide can have a negative differential resistance (NDR) phenomenon, supported by bias-dependent transmission curves of different spin orientations. Applying non-zero bias voltages makes the density of states (DOS) of the right electrodes shift down. Due to an energy gap between the LUMO and LUMO+1 in ZGOs, with a certain bias, the conduction band of the right electrode cannot match the LUMO of the scattering region, then NDR occurs. With a larger bias, NDR ends when the second conduction band of the right electrode's DOS covers the LUMO of the scattering region. Since most of proposed ZGO systems possess such a gap between the LUMO and LUMO+1, NDR can be widely observed and this discovery may provide great potential applications in NDR-based nanoelectronics by using modified graphene materials.

A New Facile Synthesis of Tungsten Oxide from Tungsten Disulfide: Structure Dependent Supercapacitor and Negative Differential Resistance Properties

“…Because of reversible change in oxidation state, there is a possibility of generation of a new band which may govern the NDR property. In an attempt to explain the NDR property a density of states (DOS) model of the two electrodes is used under different bias voltages ( Figure ) . Here we have considered the samples at positive potential region only.…”

Negative differential resistance behavior in phosphorus-doped armchair graphene nanoribbon junctions

“…1 Several GNR-based prototype devices have been fabricated, 2 and more theoretical investigations regarding its transport properties have been reported, e.g., field-effect transistors (FETs), 3,4 negative differential resistance (NDR) behavior, [5][6][7][8] and gas sensors. 9,10 In order to determine their transport properties, the electronic band structure of GNRs has been subject of great interest for a long time. GNRs show distinct electronic properties which depend upon their edge symmetry.…”

Printable Giant Magnetoresistive Devices

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