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Length-dependent Transport In Molecular Junctions Based On SAMs Of Alkanethiols And Alkanedithiols: Effect Of Metal Work Function And Applied Bias On Tunneling Efficiency And Contact Resistance.

Vincent B. Engelkes, Jeremy M. Beebe, C. Frisbie
Published 2004 · Chemistry, Medicine

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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 independent of applied bias (over a voltage range of +/-1.5 V) and electrode work function. In contrast, the contact resistance, R(0), extrapolated from resistance versus molecular length plots showed a notable decrease with both applied bias and increasing electrode work function. The doubly bound alkanedithiol junctions were observed to have a contact resistance approximately 1 to 2 orders of magnitude lower than the singly bound alkanethiol junctions. However, both alkanethiol and dithiol junctions exhibited the same length dependence (beta value). The resistance versus length data were also used to calculate transmission values for each type of contact (e.g., Au-S-C, Au/CH(3), etc.) and the transmission per C-C bond (T(C)(-)()(C)).

This paper is referenced by
Electron transport properties of helical peptide dithiol at a molecular level: Scanning tunneling microscope study
K. Kitagawa (2006)
Charge Transfer Time in Alkanethiolate Self-Assembled Monolayers via Resonant Auger Electron Spectroscopy
P. Kao (2010)
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Xingqiang Shi (2007)
Theoretical study of the source-drain current and gate leakage current to understand the graphene field-effect transistors.
Cui Yu (2011)
Top-contacting molecular monolayers using single crystalline Au microplate electrodes
Radha Boya (2013)
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L. Pan (2018)
Effect of Heteroatom Substitution on Transport in Alkanedithiol-Based Molecular Tunnel Junctions: Evidence for Universal Behavior.
Zuoti Xie (2017)
Selective DNA detection at Zeptomole level based on coulometric measurement of gold nanoparticle-mediated electron transfer across a self-assembled monolayer
Wei Wang (2013)
Charge transfer dynamics in self-assembled monomolecular films
S. Neppl (2007)
Rectified tunneling current response of bio-functionalized metal-bridge-metal junctions.
Yaqing Liu (2010)
Flicker Noise as a Probe of Electronic Interaction at Metal-Single Molecule Interfaces.
Olgun Adak (2015)
Probing the rupture of a Ag atomic junction in a Ag-Au mixed electrode
Taekyeong Kim (2015)
Metallic nanoparticle contacts for high-yield, ambient-stable molecular-monolayer devices
Gabriel Puebla-Hellmann (2018)
Charge Transport in 4 nm Molecular Wires with Interrupted Conjugation: Combined Experimental and Computational Evidence for Thermally Assisted Polaron Tunneling.
D. Taherinia (2016)
Experimental Investigation of Charge Transport and Heat Dissipation in Atomic-Scale Junctions
W. Lee (2014)
Electronic transport and mechanical stability of carboxyl linked single-molecule junctions.
Seokhoon Ahn (2012)
Thermoelectricity in Molecular Junctions
P. Reddy (2007)
Potential and kinetic sputtering of alkanethiol self-assembled monolayers by impact of highly charged ions
M. Flores (2009)
Gap states at organic–metal interfaces: A combined spectroscopic and theoretical study
Shigeru Masuda (2010)
Hydration effect on the electronic transport properties of oligomeric phenylene ethynylene molecular junctions
李宗良 (2010)
AFM study of charge transport mechanisms at electrical contacts in metal-molecule-metal systems
Chang Min Kim (2011)
Long-range ordered nanodomains of grafted electroactive molecules.
Romain Breitwieser (2013)
Electrical conductance of single-molecular junctions formed with palladium electrodes
Taekyeong Kim (2015)
Length-dependent Conductance in Conjugated Molecules in Parallel
Xiaolong Li (2015)
Activationless charge transport across 4.5 to 22 nm in molecular electronic junctions
Haijun Yan (2013)
Ultrathin pi-conjugated polymer films for simple fabrication of large-area molecular junctions.
F. Milani (2007)
Electrochemistry Investigation on Protein Protection by Alkanethiol Self-Assembled Monolayers against Urea Impact
Y. Guo (2008)
Molecular junctions based on SAMs of cruciform oligo(phenylene ethynylene)s.
Zhongming Wei (2012)
Molecular junctions of self-assembled monolayers with conducting polymer contacts.
Alexander B Neuhausen (2012)
Defining the value of injection current and effective electrical contact area for EGaIn-based molecular tunneling junctions.
F. C. Simeone (2013)
Signatures of Conformational Dynamics and Electrode-Molecule Interactions in the Conductance Profile During Pulling of Single-Molecule Junctions.
Leopoldo Mejía (2018)
Dipoles, conjugation and molecular electronics
A. Kovalchuk (2018)
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