Electronic states of graphene nanoribbons studied with the Dirac equation

Brey, L.; Fertig, H. A.

doi:10.1103/physrevb.73.235411

Cited by 1,321 publications

(720 citation statements)

References 16 publications

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“…Graphene is a gapless semiconductor [65], but when structuring the graphene into a nanometer-sized ribbon, its properties change depending on the edge profiles. Theoretical studies show that an armchair ribbon will be semiconducting [66][67][68][69] and that a zigzag-edged ribbon is metallic with a current profile that peaks at the edges [66,[69][70][71]. Both armchair and zigzag nanoribbons have been proposed to present promising platforms for DNA sequencing in a large number of theoretical reports [72][73][74][75][76][77][78][79], and experimentalists have begun to explore this approach [80][81][82][83][84][85].…”

Section: Inplane Transport Of a Graphene Nanoribbon With A Nanoporementioning

confidence: 99%

Graphene nanodevices for DNA sequencing

2016

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Fast, cheap, and reliable DNA sequencing could be one of the most disruptive innovations of this decade as it will pave the way for personalised medicine. In pursuit of such technology, a variety of nanotechnology-based approaches have been explored and established including sequencing with nanopores. Due to its unique structure and properties, graphene provides interesting opportunities for the development of a new sequencing technology. In recent years, a wide range of creative ideas for graphene sequencers have been theoretically proposed and the first experimental demonstrations have begun to appear. Here, we review the different approaches to using graphene nanodevices for DNA sequencing, which involve DNA passing through graphene nanopores, nanogaps, and nanoribbons, and the physisorption of DNA on graphene nanostructures. We discuss the advantages and problems of each of these key techniques, and provide a perspective on the use of graphene in future DNA sequencing technology.

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Section: Inplane Transport Of a Graphene Nanoribbon With A Nanoporementioning

confidence: 99%

Graphene nanodevices for DNA sequencing

2016

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“…Zigzag-edged nanoribbons can carry a spin current and, hence, can be used in spin-based nanoelectronic systems [9]. Armchair-edged nanoribbons show either metallic or semiconducting behavior as their width changes [6]. In addition, graphene nanoislands, such as triangular islands with well-defined zigzag edges, can show magnetic properties [10,11].…”

Section: Introductionmentioning

confidence: 99%

Shedding light on the crystallographic etching of multi-layer graphene at the atomic scale

et al. 2009

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The controlled etching of graphite and graphene by catalytic hydrogenation is potentially a key engineering route for the fabrication of graphene nanoribbons with atomic precision. The hydrogenation mechanism, though, remains poorly understood. In this study we exploit the benefi ts of aberration-corrected high-resolution transmission electron microscopy to gain insight to the hydrogenation reaction. The etch tracks are found to be commensurate with the graphite lattice. Catalyst particles at the head of an etch channel are shown to be faceted and the angles between facets are multiples of 30°. Thus, the angles between facets are also commensurate with the graphite lattice. In addition, the results of a post-annealing step suggest that all catalyst particles even if they are not involved in etching are actively forming methane during the hydrogenation reaction. Furthermore, the data point against carbon dissolution being a key mechanism during the hydrogenation process.

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“…[51][52][53] For example, it is known that mechanical straining can alter the band gaps of graphene nanoribbons significantly. [51,[54][55][56][57][58][59] Similarly, it has also been shown that straining can change the band gaps for h-BN nanoribbons [15,18] and large area h-BN. [60] We note that in reference, [60] the authors investigated the bandgap as a function of strain to the strain where the bandgap eventually approaches zero.…”

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confidence: 99%

Mechanics and Mechanically Tunable Band Gap in Single-Layer Hexagonal Boron-Nitride

Wang

Wei

et al. 2013

Materials Research Letters

149

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Current interest in two-dimensional materials extends from graphene to others systems like single-layer hexagonal boron-nitride (h-BN), for the possibility of making heterogeneous structures to achieve exceptional properties that cannot be realized in graphene. The electrically insulating h-BN and semi-metal graphene may open good opportunities to realize a semiconductor by manipulating the morphology and composition of such heterogeneous structures. Here we report the mechanical properties of h-BN and its band structures tuned by mechanical straining by using the density functional theory calculations. The elastic properties, both the Young's modulus and bending rigidity for h-BN, are isotropic. However, its failure strength and failure strain show strong anisotropy. We reveal that there is a bi-linear dependence of band gap on the applied tensile strains in h-BN. Mechanical strain can tune single-layer h-BN from an insulator to a semiconductor, with a band gap in the 4.7eV to 1.5eV range.

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Electronic states of graphene nanoribbons studied with the Dirac equation

Cited by 1,321 publications

References 16 publications

Graphene nanodevices for DNA sequencing

Graphene nanodevices for DNA sequencing

Shedding light on the crystallographic etching of multi-layer graphene at the atomic scale

Mechanics and Mechanically Tunable Band Gap in Single-Layer Hexagonal Boron-Nitride

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