20August2019

Nano-Micro Letters

Voltage-dependent Electronic Transport Properties of Reduced Graphene Oxide with Various Coverage Ratios

Serhan Yamacli*

Abstract
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Nano-Micro Letters, , Volume 7, Issue 1, pp 42-50

First Online: October 31, 2014 (Article)

DOI:10.1007/s40820-014-0017-1

 

Abstract

 


Considered rGO and intrinsic graphene structures: a Intrinsic graphene sheet, b, c, d, e:rGO structures with 6.25, 12.5, 25, and 50% coverages, respectively. Grey, red and white balls represent carbon, oxygen and hydrogen atoms, respectively.

Graphene is mainly implemented by these methods: exfoliating, unzipping of carbon nanotubes, chemical vapour deposition, epitaxial growth and the reduction of graphene oxide.The latter option has the advantage of low cost and precision. However reduced graphene oxide (rGO) contains hydrogen and/or oxygen atoms hence the structure and properties of the rGO and intrinsic graphene are different. Considering the advantages of the implementation and utilization of rGO, voltage-dependent electronic transport properties of severalrGO samples with various coverage ratios are investigated in this work.Ab initio simulations based on density functional theory combined with non-equilibrium Green’s function formalism are used to obtain the current-voltage characteristics and thevoltage-dependent transmission spectra of rGO samples. It is shown that the transport properties of rGO are strongly dependent on the coverage ratio. Obtained results indicate that some of the rGO samples have negative differential resistance characteristics while normally insulating rGO can behave asconducting beyond a certain threshold voltage. The reasons of the peculiarelectronic transport behaviour of rGO samples are further investigated taking the transmission eigenstates and their localization degree into consideration. The findings of this study are expected to be helpful for engineering the characteristics of rGO structures.

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