2004
DOI: 10.1021/ja046274u
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Abstract: Nanoscopic tunnel junctions were formed by contacting Au-, Pt-, or Ag-coated atomic force microscopy (AFM) tips to self-assembled monolayers (SAMs) of alkanethiol or alkanedithiol molecules on polycrystalline Au, Pt, or Ag substrates. Current-voltage traces exhibited sigmoidal behavior and an exponential attenuation with molecular length, characteristic of nonresonant tunneling. The length-dependent decay parameter, beta, was found to be approximately 1.1 per carbon atom (C(-1)) or 0.88 A(-)(1) and was indepen… Show more

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Cited by 501 publications
(858 citation statements)
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References 65 publications
(88 reference statements)
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“…The average b-value obtained was 0.54 ± 0.01 Å À 1 (Fig. 3c), which is lower than that for tunnelling transport through the aliphatic alkyl chains in n-alkanethiol/Au junctions 6,17,21 . This result confirms that the new junction system of graphene-moleculegraphene works reliably to obtain molecular tunnelling transport properties through molecular monolayers.…”
Section: Molecular Monolayer With Two-terminal Graphene Electrodesmentioning
confidence: 66%
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“…The average b-value obtained was 0.54 ± 0.01 Å À 1 (Fig. 3c), which is lower than that for tunnelling transport through the aliphatic alkyl chains in n-alkanethiol/Au junctions 6,17,21 . This result confirms that the new junction system of graphene-moleculegraphene works reliably to obtain molecular tunnelling transport properties through molecular monolayers.…”
Section: Molecular Monolayer With Two-terminal Graphene Electrodesmentioning
confidence: 66%
“…Through electrophilic diazonium reactions, the band structures of the graphene electrodes are modulated such that covalent C-C sp 3 bonds form between the aryl radicals and C ¼ C sp 2 carbon atoms. Electronic coupling between the graphene and molecules through covalent bonding may reduce the contact resistance 17 , thereby facilitating true molecular effects in monolayer-based devices. The energy positions of molecular tunnelling barriers between graphene electrodes with no applied bias are depicted (Fig.…”
Section: Molecular Monolayer With Two-terminal Graphene Electrodesmentioning
confidence: 99%
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“…In the Simmons equation, 12,13,55,56 the value of β is determined by an effective height of the barrier (φ, eV); for hole tunneling, 2,3 φ (assumed to be a simple rectangle) is the difference in energy (eV) between the Fermi level (E F ) of the electrode and the HOMO of the molecule. Although the chemical and electronic properties of R F and R H chains are different, we are not able to attribute (with confidence) the small difference (ca.…”
Section: ■ Results and Discussionmentioning
confidence: 99%
“…[13][14][15][16][17] In short, even for one of the simplest systems, i.e. that of alkyl chains between Au electrodes, there is a large discrepancy between the average tunnel barrier height, extracted from current -voltage (I − V ) measurements (∼ 1.2 eV), 14,[18][19][20][21] and the barrier that is expected from the experimentally determined electrode work function and alkyl monolayer ionization potential, i.e. the energy difference between the Fermi level and highest occupied molecular orbital (HOMO) as found by Ultraviolet Photoelectron Spectroscopy, UPS (∼ 5 eV).…”
Section: Introductionmentioning
confidence: 99%