Band structures of porous graphenes

Hatanaka, Masashi

doi:10.1016/j.cplett.2010.02.014

Cited by 42 publications

(28 citation statements)

References 22 publications

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“…Graphene is an intrinsic zero-gap semiconductor, which can be chemically or structurally modified to satisfy specific needs of nanoelectronics and optoelectronics [1][2][3][4][5]. For instance, graphene nanoribbons (GNRs) result from a radical alteration of the graphene structure, where the reduction in dimensionality leads to a quasi-one-dimensional (1D) nanowire well suited for assembly into complex networks and nanocircuits with high-density functional units [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Heterospin Junctions in Zigzag-Edged Graphene Nanoribbons

2014

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We propose a graphene nanoribbon-based heterojunction, where a defect-free interface separates two zigzag graphene nanoribbons prepared in opposite antiferromagnetic spin configurations. This heterospin junction is found to allow the redirecting of low-energy electrons from one edge to the other. The basic scattering mechanisms and their relation to the system's geometry are investigated through a combination of Landauer-Green's function and the S-matrix and eigen-channel methods within a tight-binding + Hubbard model validated with density functional theory. The findings demonstrate the possibility of using zigzag-edged graphene nanoribbons (zGNRs) in complex networks where current can be transmitted across the entire system, instead of following the shortest paths along connected edges belonging to the same sub-lattice.

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Section: Introductionmentioning

confidence: 99%

Heterospin Junctions in Zigzag-Edged Graphene Nanoribbons

2014

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“…The Hückel-level dispersion and DOS (density of states) are shown in Figs. 6 and 7 (Hatanaka, 2010b). The dispersion suggests semi-conductive band gaps, and the frontier bands are so flat as to be available for ferromagnetism.…”

Section: Methylene-edged Graphenesmentioning

confidence: 97%

“…They synthesized porous graphene by aryl-aryl coupling reactions on Ag (111) surface, and observed STM (scanning tunneling microscope) image of the honeycomb structures. In 2010, band structures of porous graphenes were investigated by several workers (Du et al, 2010;Hatanaka, 2010b;Li et al, 2010). The Hückel-level dispersion and DOS (density of states) are shown in Figs.…”

Section: Methylene-edged Graphenesmentioning

confidence: 99%

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Electronic States of Graphene-Based Ferromagnets

Hatanaka¹

2011

Graphene Simulation

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“…The electronic properties of 2D polyphenylene-type porous graphene have been investigated using both density functional theory (DFT) [16,22] and crystal orbital methods [28]. The computations all revealed that this porous graphene is a semiconductor with a direct band gap.…”

Section: Electronic Properties Of Porous Graphenementioning

confidence: 99%

Porous graphene: Properties, preparation, and potential applications

et al. 2012

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Graphene has recently emerged as an important and exciting material. Inspired by its outstanding properties, many researchers have extensively studied graphene-related materials both experimentally and theoretically. Porous graphene is a collection of graphene-related materials with nanopores in the plane. Porous graphene exhibits properties distinct from those of graphene, and it has widespread potential applications in various fields such as gas separation, hydrogen storage, DNA sequencing, and supercapacitors. In this review, we summarize recent progress in studies of the properties, preparation, and potential applications of porous graphene, and show that porous graphene is a promising material with great potential for future development.graphene, porous graphene, electronic structure, gas separation, DNA sequencing Citation:Xu P T, Yang J X, Wang K S, et al. [9] have made the preparation of large-area graphene feasible. The most intriguing aspect of graphene is its extraordinary properties. Graphene, which is constructed by strong sp 2 covalent bonds, is believed to be the strongest material ever measured [10]. Experiments have revealed that graphene exhibits a high ambipolar electric-field effect at room temperature, better conductivity than any other known material [3], and many other novel properties, including room-temperature quantum Hall effects, mass-less Dirac electrons near the K point, and high mobility of carriers (10 6 m s −1 , close to the speed of light) [11][12][13]. All these properties distinguish graphene from ordinary materials, and make graphene an ideal candidate for the manufacture of electronic devices. To develop a full understanding of its nature and realize the full potential of graphene, extensive investigations have proceeded in various directions. For instance, the electronic and magnetic properties of graphene can be modified by hydrogenation [14] and doping [15]. Another research area, porous graphene, has also attracted increasing attention recently. Porous graphene is a collection of graphene-related materials with nanopores in the plane. Depending on the production techniques used, the pore size ranges from atomic precision to nanoscale. As a result of the nanopores in the graphene plane, porous graphene exhibits properties distinct from those of pristine graphene, leading to its potential applications in numerous

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Band structures of porous graphenes

Cited by 42 publications

References 22 publications

Heterospin Junctions in Zigzag-Edged Graphene Nanoribbons

Heterospin Junctions in Zigzag-Edged Graphene Nanoribbons

Electronic States of Graphene-Based Ferromagnets

Porous graphene: Properties, preparation, and potential applications

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