Mechanical and charge transport properties of alkanethiol self-assembled monolayers on Au (111) surface: The Role of Molecular Tilt

Title: Mechanical and charge transport properties of alkanethiol self-assembled monolayers on Au (111) surface: The Role of Molecular Tilt

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Abstract

The relationship between charge transport and mechanical properties of alkanethiol self-assembled monolayers (SAM) on Au(111) films has been investigated using an atomic force microscope with a conductive tip. Molecular tilts induced by the pressure applied by the tip cause stepwise increases in film conductivity. A decay constant {beta} = 0.57 {+-} 0.03 {angstrom}{sup -1} was found for the current passing through the film as a function of tip-substrate separation due to this molecular tilt. This is significantly smaller than the value of {approx} 1 {angstrom}{sup -1} found when the separation is changed by changing the length of the alkanethiol molecules. Calculations indicate that for isolated dithiol molecules S-bonded to hollow sites, the junction conductance does not vary significantly as a function of molecular tilt. The impact of S-Au bonding on SAM conductance is discussed.

Authors:: Mulleregan, Alice; Qi, Yabing; Ratera, Imma; Park, Jeong Y; Ashby, Paul D; Quek, Su Ying; Neaton, J B; Salmeron, Miquel

Publication Date:: 2007-11-12

Research Org.:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Org.:: Materials Sciences Division

OSTI Identifier:: 926165

Report Number(s):: LBNL-69E
Journal ID: ISSN 0743-7463; LANGD5; TRN: US200807%%503

DOE Contract Number:: DE-AC02-05CH11231

Resource Type:: Journal Article

Journal Name:: Langmuir

Additional Journal Information:: Journal Volume: 24; Journal Issue: 5; Related Information: Journal Publication Date: 2008; Journal ID: ISSN 0743-7463

Country of Publication:: United States

Language:: English

Subject:: 36; BONDING; CHARGE TRANSPORT; DECAY; DITHIOLS; MECHANICAL PROPERTIES; MICROSCOPES

Citation Formats


                    Mulleregan, Alice, Qi, Yabing, Ratera, Imma, Park, Jeong Y, Ashby, Paul D, Quek, Su Ying, Neaton, J B, and Salmeron, Miquel. Mechanical and charge transport properties of alkanethiol self-assembled monolayers on Au (111) surface: The Role of Molecular Tilt.  United States: N. p., 2007. 
        Web.

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                    Mulleregan, Alice, Qi, Yabing, Ratera, Imma, Park, Jeong Y, Ashby, Paul D, Quek, Su Ying, Neaton, J B, & Salmeron, Miquel. Mechanical and charge transport properties of alkanethiol self-assembled monolayers on Au (111) surface: The Role of Molecular Tilt.  United States.

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                    Mulleregan, Alice, Qi, Yabing, Ratera, Imma, Park, Jeong Y, Ashby, Paul D, Quek, Su Ying, Neaton, J B, and Salmeron, Miquel. Mon .  
        "Mechanical and charge transport properties of alkanethiol self-assembled monolayers on Au (111) surface: The Role of Molecular Tilt".  United States.  https://www.osti.gov/servlets/purl/926165.

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@article{osti_926165,

  title        = {Mechanical and charge transport properties of alkanethiol self-assembled monolayers on Au (111) surface: The Role of Molecular Tilt},

  author       = {Mulleregan, Alice and Qi, Yabing and Ratera, Imma and Park, Jeong Y and Ashby, Paul D and Quek, Su Ying and Neaton, J B and Salmeron, Miquel},

  abstractNote = {The relationship between charge transport and mechanical properties of alkanethiol self-assembled monolayers (SAM) on Au(111) films has been investigated using an atomic force microscope with a conductive tip. Molecular tilts induced by the pressure applied by the tip cause stepwise increases in film conductivity. A decay constant {beta} = 0.57 {+-} 0.03 {angstrom}{sup -1} was found for the current passing through the film as a function of tip-substrate separation due to this molecular tilt. This is significantly smaller than the value of {approx} 1 {angstrom}{sup -1} found when the separation is changed by changing the length of the alkanethiol molecules. Calculations indicate that for isolated dithiol molecules S-bonded to hollow sites, the junction conductance does not vary significantly as a function of molecular tilt. The impact of S-Au bonding on SAM conductance is discussed.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/926165},
  journal      = {Langmuir},

  issn         = {0743-7463},

  number       = 5,

  volume       = 24,

  place        = {United States},

  year         = {2007},

  month        = {11}

}

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