Potential barrier of graphene edges

Wang, Weiliang; Li, Zhibing

doi:10.1063/1.3587186

Cited by 52 publications

(39 citation statements)

References 36 publications

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“…First, a clear boundary of GO is easily found in the SP map, implying that the edges of GO sheets show relatively lower SP compared to the in-plane smooth surface as marked by arrows in Figure 3(b). It is well known that the local work function of graphene would increase with the present of vacancy or unsaturated bonds (28). The low SP values at the edges of GO are suggested to be attributed to the relatively larger amount of unsaturated bonds, which is in good agreement with the widely reports of First-principles calculations results (29,30).…”

Section: Resultssupporting

confidence: 87%

Surface Potential of Graphene Oxide Investigated by Kelvin Probe Force Microscopy

Hao

et al. 2015

Fullerenes, Nanotubes and Carbon Nanostructures

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In the paper, the graphene oxide (GO) prepared by modified Hummers method was characterized by Raman spectrum, Fourier transform infrared spectrum (FTIR), and Atomic Force Microscopy (AFM). Using Kelvin Probe Force Microscopy (KPFM), the surface potential of GO was investigated, and it was found that the GO film exhibited the uniform surface potential distribution. The surface potentials at the edges and wrinkles of GO film were much lower than that at the in-plane flat area, which is proposed to be contributed to the bonds' unsaturated and disorder at these zones. These results provide insight into understanding electronic properties of GO-based composites and devices.

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Section: Resultssupporting

confidence: 87%

Surface Potential of Graphene Oxide Investigated by Kelvin Probe Force Microscopy

Hao

et al. 2015

Fullerenes, Nanotubes and Carbon Nanostructures

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“…The fit using the Simmons model is plotted (black dashed line) along with the data in is common for the Simmons model when applied to small junctions (e.g. Au nanogaps) but could also include a barrier lowering due to water or OH groups absorbed at the gap edge [34][35][36]. While the barrier height has been found to deviate from the expected value, scanning tunneling microscopy studies of Au nanogaps have shown a consistency between the extracted gap size from the Simmons fit and the actual electrode separation [37].…”

Section: Electroburning Of As-exfoliated Flakes Often Results In Gapsmentioning

confidence: 99%

Fabrication of hybrid molecular devices using multi-layer graphene break junctions

Island¹,

Holovchenko²,

Alkemade³

et al. 2014

J. Phys.: Condens. Matter

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We report on the fabrication of hybrid molecular devices employing multi-layer graphene (MLG) flakes which are patterned with a constriction using a helium ion microscope or an oxygen plasma etch. The patterning step allows for the localization of a few-nanometer gap, created by electroburning, that can host single molecules or molecular ensembles. By controlling the width of the sculpted constriction, we regulate the critical power at which the electroburning process begins. We estimate the flake temperature given the critical power and find that at low powers it is possible to electroburn MLG with superconducting contacts in close proximity. Finally, we demonstrate the fabrication of hybrid devices with superconducting contacts and anthracene-functionalized copper curcuminoid molecules. This method is extendable to spintronic devices with ferromagnetic contacts and a first step towards molecular integrated circuits.

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“…There have been many studies on the peculiar edge properties of graphene. [15][16][17][18][19][20][21] The zigzag edge (Z-edge) and armchair edge (A-edge) being the most studied edges have drastically different electronic properties. The Z-edge can sustain edge states and resonances that are not present in the A-edge.…”

Section: Introductionmentioning

confidence: 99%

Potential barrier and band structure of closed edge graphene

Wang

2013

Journal of Applied Physics

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The atomic structure, electron distribution, work function, and band structure of closed edge graphene are investigated with density functional theory. Field emission performance of closed edge graphene is compared with that of open edge graphene. We provide a possible explanation for the field emission microscopy image change after high emission current, which appeals to the experimentalists for further investigation. V C 2013 AIP Publishing LLC. [http://dx.

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Potential barrier of graphene edges

Cited by 52 publications

References 36 publications

Surface Potential of Graphene Oxide Investigated by Kelvin Probe Force Microscopy

Surface Potential of Graphene Oxide Investigated by Kelvin Probe Force Microscopy

Fabrication of hybrid molecular devices using multi-layer graphene break junctions

Potential barrier and band structure of closed edge graphene

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