Intrinsic electronic and transport properties of graphene nanoribbons with different widths

Zhang, Liuyue; Zhao, Jianwei; Cheng, Na; Chen, Zhidong

doi:10.1039/c9cp06461c

Cited by 19 publications

(13 citation statements)

References 53 publications

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“…When the Fermi energy of graphene and highest occupied molecular orbitals/lowest unoccupied molecular orbitals of organic materials matches, it facilitates electrostatic gating as a result of reduced screening compared to that of massive metallic electrodes. Owing to the planar honeycomb-type hexagonal structure and edge effects, the ballistic transport of electrons in graphene is significantly affected by the local environment (including the chemical and bond environment), electron density, hydrophobicity, and electronegativity . For the labeling of DNA nucleotides, we use glycine (Gly) molecules.…”

Section: Introductionmentioning

confidence: 99%

“…Owing to the planar honeycomb-type hexagonal structure and edge effects, the ballistic transport of electrons in graphene is significantly affected by the local environment (including the chemical and bond environment), electron density, hydrophobicity, and electronegativity. 25 For the labeling of DNA nucleotides, we use glycine (Gly) molecules. The motivation behind choosing Gly as a label has been drawn from the following aspects: Gly-labeled DNA has been experimentally realized for sensing through the biological pore, 26 and Gly is the smallest (neutral) amino acid, so it would not affect the translocation of negatively charged DNA under the effect of electrophoresis.…”

Section: Introductionmentioning

confidence: 99%

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Amplifying Quantum Tunneling Current Sensitivity through Labeling Nucleotides Using Graphene Nanogap Electrodes

Mittal

Jena

Pathak

2022

ACS Appl. Nano Mater.

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Recent advances in cost-effective, ultra-rapid, and efficient DNA sequencing are in the saddle of the advancement of the personalization of medicines for understanding and early-stage detection of several killer diseases. Paying attention to a timely need for the development of solid-state nanodevices for rapid and controlled identification of DNA nucleotides, in this report, we theoretically explored the potential of labeling techniques in the sequencing of DNA nucleotides through solid-state graphene nanogap electrodes using the quantum tunneling current approach. Our study boasts the idea that labeling of DNA nucleotides can solve major hurdles of DNA sequencing, such as improving the signal-to-noise ratio, slowing down translocation velocity, and controlling orientational variations. Employing the first-principle density functional theory study, we identify unique interaction energy values for each labeled nucleotide having remarkable differences in the range of 0.10–0.74 eV. The zero-bias transmission spectra of the proposed setup suggest that the detection of the nucleotides is possible by applying very low gate voltages. Moreover, the labeling of nucleotides amplifies the conductance sensitivity considerably. I–V characteristics suggest that electrical recognition of each labeled nucleotide can be carried out at both lower (0.3 V) and higher (0.8 V) bias voltages with single-molecule resolution, although the maximum current sensitivity is observed at a higher bias voltage. The proposed sequencing device possesses high sensitivity and selectivity characteristics that are crucial for experimental purposes. We find that our results are rich compared to unlabeled nucleotides-based graphene nanopore/nanogap devices. Hence, the study will certainly motivate the experimentalists toward the application of a labeled DNA nucleotide system for ultra-rapid DNA sequencing by using the tunneling current approach.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Amplifying Quantum Tunneling Current Sensitivity through Labeling Nucleotides Using Graphene Nanogap Electrodes

Mittal

Jena

Pathak

2022

ACS Appl. Nano Mater.

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“…Therefore, the increase in the width (for M > 4) of ZGNRs does not improve the transmission through them. [254] The presence of defects, roughness at the edges, and impurities can strongly modify the properties of graphene nanoribbons. The electronic conductance of ZGNRs and AGNRs depends strongly on the position of defects.…”

Section: Summary and Future Perspectivesmentioning

confidence: 99%

“…Therefore, the increase in the width (for

M > 4

) of ZGNRs does not improve the transmission through them. [ 254 ]…”

Section: Summary and Future Perspectivesmentioning

confidence: 99%

“…[241] This reflects the semiconducting behavior of graphene strips. [241,254] In the case of ZGNRs, under the influence of finite potential well, the transport from one electrode to the other increases with an increase in the number of atoms per unit cell. This is due to the fact that the number of conducting channels increases because of the formation of the localized states with an increase in the number of atoms per unit cell.…”

Section: Transport Properties Of Graphene Nanoribbonsmentioning

confidence: 99%

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Electronic, transport, magnetic, and optical properties of graphene nanoribbons and their optical sensing applications: A comprehensive review

et al. 2022

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Low dimensional materials have attracted great research interest from both theoretical and experimental point of views. These materials exhibit novel physical and chemical properties due to the confinement effect in low dimensions. The experimental observations of graphene open a new platform to study the physical properties of materials restricted to two dimensions. This featured article provides a review on the novel properties of quasi one‐dimensional (1D) material known as graphene nanoribbon. Graphene nanoribbons can be obtained by unzipping carbon nanotubes (CNT) or cutting the graphene sheet. Alternatively, it is also called the finite termination of graphene edges. It gives rise to different edge geometries, namely zigzag and armchair, among others. There are various physical and chemical techniques to realize these materials. Depending on the edge type termination, these are called the zigzag and armchair graphene nanoribbons (ZGNR and AGNR). These edges play an important role in controlling the properties of graphene nanoribbons. The present review article provides an overview of the electronic, transport, optical, and magnetic properties of graphene nanoribbons. However, there are different ways to tune these properties for device applications. Here, some of them, such as external perturbations and chemical modifications, are highlighted. Few applications of graphene nanoribbon have also been briefly discussed.

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Study of conductance in graphene nanochannels for symmetric and asymmetric junction configurations

Patra,

Sahu,

Mishra

et al. 2024

Microsyst Technol

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Intrinsic electronic and transport properties of graphene nanoribbons with different widths

Abstract: Except for the narrow ZGNRs, 1-ZGNR and 2-ZGNR, odd ZGNRs possess small current regardless of the bias applied and even ZGNRs have much larger current and behave as a resistor.

Cited by 19 publications

References 53 publications

Amplifying Quantum Tunneling Current Sensitivity through Labeling Nucleotides Using Graphene Nanogap Electrodes

Amplifying Quantum Tunneling Current Sensitivity through Labeling Nucleotides Using Graphene Nanogap Electrodes

Electronic, transport, magnetic, and optical properties of graphene nanoribbons and their optical sensing applications: A comprehensive review

Study of conductance in graphene nanochannels for symmetric and asymmetric junction configurations

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