Tuning the Band Gap of Graphene Nanoribbons Synthesized from Molecular Precursors

Chen, Yen-Chia; Oteyza, Dimas G. de; Pedramrazi, Zahra; Chen, Chen; Fischer, Felix R.; Crommie, Michael F.

doi:10.1021/nn401948e

Cited by 532 publications

(615 citation statements)

References 31 publications

(59 reference statements)

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“…For some prototypical GNRs, this has recently been achieved using a bottom-up approach based on the covalent assembly of suitably designed molecular precursors 12 . The characterization of their electronic 13,14 and transport 15 properties revealed substantial band gaps that fully confirm the predictions 13,16 . This opens a way to tailor precise structural arrangements in the regime of ultranarrow GNRs and to realize specific edge terminations.…”

supporting

confidence: 70%

Exciton-dominated optical response of ultra-narrow graphene nanoribbons

et al. 2014

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Narrow graphene nanoribbons exhibit substantial electronic bandgaps and optical properties fundamentally different from those of graphene. Unlike graphene-which shows a wavelength-independent absorbance for visible light-the electronic bandgap, and therefore the optical response, of graphene nanoribbons changes with ribbon width. Here we report on the optical properties of armchair graphene nanoribbons of width N ¼ 7 grown on metal surfaces. Reflectance difference spectroscopy in combination with ab initio calculations show that ultranarrow graphene nanoribbons have fully anisotropic optical properties dominated by excitonic effects that sensitively depend on the exact atomic structure. For N ¼ 7 armchair graphene nanoribbons, the optical response is dominated by absorption features at 2.1, 2.3 and 4.2 eV, in excellent agreement with ab initio calculations, which also reveal an absorbance of more than twice the one of graphene for linearly polarized light in the visible range of wavelengths.

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confidence: 70%

Exciton-dominated optical response of ultra-narrow graphene nanoribbons

et al. 2014

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“…34 Zigzag ribbons are predicted to be metallic for all ribbon widths. First samples of small graphene nanoribbons have been synthesized recently [10][11][12][13][14][15][16][17] indicating the predicted behavior. Here, we present emulation experiments of the electronic transport through small nanoribbons with specific edges and atomically precise connections to source and drain leads.…”

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confidence: 71%

Transport gap engineering by contact geometry in graphene nanoribbons: Experimental and theoretical studies on artificial materials

et al. 2017

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Electron transport in small graphene nanoribbons is studied by microwave emulation experiments and tight-binding calculations. In particular, it is investigated under which conditions a transport gap can be observed. Our experiments provide evidence that armchair ribbons of width 3m + 2 with integer m are metallic and otherwise semiconducting, whereas zigzag ribbons are metallic independent of their width. The contact geometry, defining to which atoms at the ribbon edges the source and drain leads are attached, has strong effects on the transport. If leads are attached only to the inner atoms of zigzag edges, broad transport gaps can be observed in all armchair ribbons as well as in rhomboid-shaped zigzag ribbons. All experimental results agree qualitatively with tight-binding calculations using the nonequilibrium Green's function method.

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“…Several recent studies have focused on the synthesis of GNRs by the bottom-up approaches that rely on building GNRs from smaller molecular species. [7][8][9][10][11][12][13][14][15][16][17][18][19][20] The resulting GNRs are very narrow (typically with widths, w < 2 nm) and have atomically precise edges, which is very important for potential applications. [3][4][5][6]21,22 One type of synthetic GNRs that has received considerable theoretical [23][24][25] and experimental attention 9,16,19,20,26 is the chevron-like GNR that has a very distinct periodic structure (Fig.…”

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confidence: 99%

Bulk properties of solution-synthesized chevron-like graphene nanoribbons

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Shekhirev²,

Lipatov³

et al. 2014

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Graphene nanoribbons (GNRs) have received a great deal of attention due to their promise for electronic and optoelectronic applications. Several recent studies have focused on the synthesis of GNRs by the bottom-up approaches that could yield very narrow GNRs with atomically precise edges. One type of GNRs that has received a considerable attention is the chevron-like GNR with a very distinct periodic structure. Surface-assisted and solution-based synthetic approaches for the chevron-like GNRs have been developed, but their electronic properties have not been reported yet. In this work, we synthesized chevron-like GNRs in bulk by a solution-based method, characterized them by a number of spectroscopic techniques and measured their bulk conductivity. We demonstrate that solution-synthesized chevron-like GNRs are electrically conductive in bulk, which makes them a potentially promising material for applications in organic electronics and photovoltaics.

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Tuning the Band Gap of Graphene Nanoribbons Synthesized from Molecular Precursors

Cited by 532 publications

References 31 publications

Exciton-dominated optical response of ultra-narrow graphene nanoribbons

Exciton-dominated optical response of ultra-narrow graphene nanoribbons

Transport gap engineering by contact geometry in graphene nanoribbons: Experimental and theoretical studies on artificial materials

Bulk properties of solution-synthesized chevron-like graphene nanoribbons

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