First principles study of the voltage-dependent conductance properties of n-type and p-type graphene–metal contacts

Yamaçli, Serhan

doi:10.1016/j.commatsci.2013.09.015

Cited by 8 publications

(9 citation statements)

References 42 publications

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“…Our results demonstrate that graphene, as far as it is produced by CVD and deposited on a functions of materials [27][28][29][30][31][32][33][34]. First, when graphene rests on Cu, it is known that it should be usually n-doped [27][28][29][30][31].…”

Section: Discussionmentioning

confidence: 88%

“…First, when graphene rests on Cu, it is known that it should be usually n-doped [27][28][29][30][31]. although electron transfer from graphene to Au is well known to occur efficiently [29][30][31][32][33][34].…”

Section: Discussionmentioning

confidence: 99%

“…In fact, considering the theoretical current-voltage characteristic of graphene@Cu, the result predicted by Yamacli [29] is just the opposite of the one expected by Li et al's assumption. By contrast, graphene@Au is p-doped[29][30][31][32][33][34] and therefore electrons tend to be transferred from graphene to Au. In this case, the theoretical current-voltage characteristic of graphene@Au[29] meets the assumption of Li et al's model in terms of electron transfer direction.…”

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confidence: 99%

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Do CVD grown graphene films have antibacterial activity on metallic substrates?

Dellieu

Lawarée

Reckinger

et al. 2015

Carbon

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Accurate assessment of the antibacterial activity of graphene requires consideration of both the graphene fabrication method and, for supported films, the properties of the substrate.Large-area graphene films produced by chemical vapor deposition were grown directly on copper substrates or transferred on a gold substrate and their effect on the viability and proliferation of the Gram-positive bacteria Staphylococcus aureus and the Gram-negative bacteria Escherichia coli were assessed. The viability and the proliferation of both bacterial species were not affected when they were grown on a graphene film entirely covering the gold substrate, indicating that conductivity plays no role on bacterial viability and graphene has no antibacterial activity against S. aureus and E. coli. On the other hand, antibacterial activity * Corresponding author : Email address : louis.dellieu@unamur.be (L. Dellieu) FAX : +32 81 72 44 64 2 was observed when graphene coated the copper substrates, resulting from the release of bactericidal cupric ions in inverse proportion to the graphene surface coverage.

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Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Do CVD grown graphene films have antibacterial activity on metallic substrates?

Dellieu

Lawarée

Reckinger

et al. 2015

Carbon

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“…The measurements were also performed on bare graphene and bare gold substrates (deposited through E-beam evaporation), resulting in WFs of 4.75 ± 0.05 eV and 5.1 ± 0.05 eV, respectively, which are within the range reported in the literature. [ 25,26,29,37 ] Figure 3 c shows the changes in the WF of graphene by Au and PEIE layer. As expected, charge transfer at the Au-graphene interface causes p-doping in the graphene sheet due to differences in their WFs resulting in a WF of 4.9 ± 0.1 for Au/graphene.…”

Section: Work Function Measurementsmentioning

confidence: 98%

Formation of Air Stable Graphene p–n–p Junctions Using an Amine‐Containing Polymer Coating

Sojoudi

Baltazar

Tolbert

et al. 2014

Adv Materials Inter

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An ultrathin layer of a polymer containing simple aliphatic amine groups, polyethylenimine ethoxylated (PEIE), is deposited on a back‐gated field effect graphene device to form graphene p–n–p junctions. Characteristic I–V curves indicate the superposition of two separate Dirac points, which confirms an energy separation of neutrality points within the complementary regions. This is a simple approach for making graphene p–n–p junctions without a need for multiple lithography steps or electrostatic gates and, unlike, the destructive techniques such as substitutional doping or covalent functionalization, it induces a minor defect, if any, as there is no discernible D peak in the Raman spectra of the graphene films after creating junctions and degradation in the charge carrier mobilities of the graphene devices. This method can be easily processed from dilute solutions in environmentally‐friendly solvents such as water or methoxyethanol and does not suffer any change upon exposure to air or heating at temperatures below 100 °C.

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“…6). A similar type-conductivity has been noted for carbon nanotubes [32]. The position of the band edges under the working electrode was experimentally determined from the capacitance measurement (Mott-Schottky, MS).…”

Section: Resultsmentioning

confidence: 99%