Charge transport through dicarboxylic-acid-terminated alkanes bound to graphene-gold nanogap electrodes

Physics

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Theory of Molecular-Scale Transport

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C6NR03807G
Rights statement: This journal is © The Royal Society of Chemistry 2016
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Charge transport through dicarboxylic-acid-terminated alkanes bound to graphene-gold nanogap electrodes. / Liu, Longlong; Zhang, Gian; Tao, Shuhui et al.
In: Nanoscale, Vol. 8, No. 30, 14.08.2016, p. 14507-14513.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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Liu, Longlong ; Zhang, Gian ; Tao, Shuhui et al. / Charge transport through dicarboxylic-acid-terminated alkanes bound to graphene-gold nanogap electrodes. In: Nanoscale. 2016 ; Vol. 8, No. 30. pp. 14507-14513.

Bibtex

@article{1ecb2b4badc2493abeeddb11cf3460d9,

title = "Charge transport through dicarboxylic-acid-terminated alkanes bound to graphene-gold nanogap electrodes",

abstract = "Graphene-based electrodes are attractive for single-molecule electronics due to their high stability and conductivity and reduced screening compared with metals. In this paper, we use the STM-based matrix isolation I(s) method to measure the performance of graphene in single-molecule junctions with one graphene electrode and one gold electrode. By measuring the length dependence of the electrical conductance of dicarboxylic-acid-terminated alkanes, we find that transport is consistent with phase-coherent tunneling, but with an attenuations factor βN = 0.69 per methyl unit, which is lower than the value measured for Au-molecule-Au junctions. Comparison with density-functional-theory calculations of electron transport through graphene-molecule-Au junctions and Au-molecule-Au junctions reveals that this difference is due to the difference in Fermi energies of the two types of junction, relative to the frontier orbitals of the molecules. For most molecules, their electrical conductance in graphene-molecule-Au junctions is higher than that in Au-molecule-Au junctions, which suggests that graphene offers superior electrode performance, when utilizing carboxylic acid anchor groups.",

author = "Longlong Liu and Gian Zhang and Shuhui Tao and Zhao, {C. Z.} and Eman Almutib and Qusiy Al-Galiby and Bailey, {Steven William Dennis} and Grace, {Iain Mark} and Lambert, {Colin John} and Jun Du and Li Yang",

note = "This journal is {\textcopyright} The Royal Society of Chemistry 2016",

year = "2016",

month = aug,

day = "14",

doi = "10.1039/C6NR03807G",

language = "English",

volume = "8",

pages = "14507--14513",

journal = "Nanoscale",

issn = "2040-3364",

publisher = "Royal Society of Chemistry",

number = "30",

}

RIS

TY - JOUR

T1 - Charge transport through dicarboxylic-acid-terminated alkanes bound to graphene-gold nanogap electrodes

AU - Liu, Longlong

AU - Zhang, Gian

AU - Tao, Shuhui

AU - Zhao, C. Z.

AU - Almutib, Eman

AU - Al-Galiby, Qusiy

AU - Bailey, Steven William Dennis

AU - Grace, Iain Mark

AU - Lambert, Colin John

AU - Du, Jun

AU - Yang, Li

PY - 2016/8/14

Y1 - 2016/8/14

N2 - Graphene-based electrodes are attractive for single-molecule electronics due to their high stability and conductivity and reduced screening compared with metals. In this paper, we use the STM-based matrix isolation I(s) method to measure the performance of graphene in single-molecule junctions with one graphene electrode and one gold electrode. By measuring the length dependence of the electrical conductance of dicarboxylic-acid-terminated alkanes, we find that transport is consistent with phase-coherent tunneling, but with an attenuations factor βN = 0.69 per methyl unit, which is lower than the value measured for Au-molecule-Au junctions. Comparison with density-functional-theory calculations of electron transport through graphene-molecule-Au junctions and Au-molecule-Au junctions reveals that this difference is due to the difference in Fermi energies of the two types of junction, relative to the frontier orbitals of the molecules. For most molecules, their electrical conductance in graphene-molecule-Au junctions is higher than that in Au-molecule-Au junctions, which suggests that graphene offers superior electrode performance, when utilizing carboxylic acid anchor groups.

AB - Graphene-based electrodes are attractive for single-molecule electronics due to their high stability and conductivity and reduced screening compared with metals. In this paper, we use the STM-based matrix isolation I(s) method to measure the performance of graphene in single-molecule junctions with one graphene electrode and one gold electrode. By measuring the length dependence of the electrical conductance of dicarboxylic-acid-terminated alkanes, we find that transport is consistent with phase-coherent tunneling, but with an attenuations factor βN = 0.69 per methyl unit, which is lower than the value measured for Au-molecule-Au junctions. Comparison with density-functional-theory calculations of electron transport through graphene-molecule-Au junctions and Au-molecule-Au junctions reveals that this difference is due to the difference in Fermi energies of the two types of junction, relative to the frontier orbitals of the molecules. For most molecules, their electrical conductance in graphene-molecule-Au junctions is higher than that in Au-molecule-Au junctions, which suggests that graphene offers superior electrode performance, when utilizing carboxylic acid anchor groups.

U2 - 10.1039/C6NR03807G

DO - 10.1039/C6NR03807G

M3 - Journal article

VL - 8

SP - 14507

EP - 14513

JO - Nanoscale

JF - Nanoscale

SN - 2040-3364

IS - 30

ER -

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