Friction and Adhesion on Different Phases of a Biphenyl-Alkanethiol Self-Assembled Monolayer on Gold Studied with Scanning Force Microscopy

Francis J. McCarthy; Manfred Buck; Georg Hähner

doi:10.1021/jp807491t

Friction and Adhesion on Different Phases of a Biphenyl-Alkanethiol Self-Assembled Monolayer on Gold Studied with Scanning Force Microscopy

Francis J. McCarthy, Manfred Buck, Georg Hähner

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

We have investigated the friction and adhesion properties of two structurally different phases of omega-(4'-methylbiphenyl-4-yl) butanethiol CH3(C6H4)(2)(CH2)(4)SH (BP4) self-assembled monolayers (SAMs) on gold under water with scanning force microscopy. While the identical chemistry of the two phases is reflected by very similar water contact angle values, lateral force measurements and force distance curves reveal the strong influence of the structure, that is, of the molecular and defect density on the mechanical properties of the SAM. A surprisingly high difference in the resistance of the films to shearing but a similar friction coefficient is found for the two phases indicating a crucial influence of the film structure on the energy dissipation in SAMs. The results highlight the importance of structural effects in the interpretation of surface properties.

Original language	English
Pages (from-to)	19465-19469
Number of pages	5
Journal	Journal of Physical Chemistry C
Volume	112
Issue number	49
DOIs	https://doi.org/10.1021/jp807491t
Publication status	Published - 11 Dec 2008

Keywords

STRUCTURAL CHARACTERIZATION
ELECTRICAL-CONDUCTION
THIOL MONOLAYERS
AROMATIC THIOLS
MOLECULAR WIRES
AU(111)
SILVER
SPECTROSCOPY
POLYMORPHISM
STABILITY

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10.1021/jp807491t

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title = "Friction and Adhesion on Different Phases of a Biphenyl-Alkanethiol Self-Assembled Monolayer on Gold Studied with Scanning Force Microscopy",

abstract = "We have investigated the friction and adhesion properties of two structurally different phases of omega-(4'-methylbiphenyl-4-yl) butanethiol CH3(C6H4)(2)(CH2)(4)SH (BP4) self-assembled monolayers (SAMs) on gold under water with scanning force microscopy. While the identical chemistry of the two phases is reflected by very similar water contact angle values, lateral force measurements and force distance curves reveal the strong influence of the structure, that is, of the molecular and defect density on the mechanical properties of the SAM. A surprisingly high difference in the resistance of the films to shearing but a similar friction coefficient is found for the two phases indicating a crucial influence of the film structure on the energy dissipation in SAMs. The results highlight the importance of structural effects in the interpretation of surface properties.",

keywords = "STRUCTURAL CHARACTERIZATION, ELECTRICAL-CONDUCTION, THIOL MONOLAYERS, AROMATIC THIOLS, MOLECULAR WIRES, AU(111), SILVER, SPECTROSCOPY, POLYMORPHISM, STABILITY",

author = "McCarthy, {Francis J.} and Manfred Buck and Georg H{\"a}hner",

year = "2008",

month = dec,

day = "11",

doi = "10.1021/jp807491t",

language = "English",

volume = "112",

pages = "19465--19469",

journal = "Journal of Physical Chemistry C",

issn = "1932-7447",

publisher = "American Chemical Society (ACS)",

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T1 - Friction and Adhesion on Different Phases of a Biphenyl-Alkanethiol Self-Assembled Monolayer on Gold Studied with Scanning Force Microscopy

AU - McCarthy, Francis J.

AU - Buck, Manfred

AU - Hähner, Georg

PY - 2008/12/11

Y1 - 2008/12/11

N2 - We have investigated the friction and adhesion properties of two structurally different phases of omega-(4'-methylbiphenyl-4-yl) butanethiol CH3(C6H4)(2)(CH2)(4)SH (BP4) self-assembled monolayers (SAMs) on gold under water with scanning force microscopy. While the identical chemistry of the two phases is reflected by very similar water contact angle values, lateral force measurements and force distance curves reveal the strong influence of the structure, that is, of the molecular and defect density on the mechanical properties of the SAM. A surprisingly high difference in the resistance of the films to shearing but a similar friction coefficient is found for the two phases indicating a crucial influence of the film structure on the energy dissipation in SAMs. The results highlight the importance of structural effects in the interpretation of surface properties.

AB - We have investigated the friction and adhesion properties of two structurally different phases of omega-(4'-methylbiphenyl-4-yl) butanethiol CH3(C6H4)(2)(CH2)(4)SH (BP4) self-assembled monolayers (SAMs) on gold under water with scanning force microscopy. While the identical chemistry of the two phases is reflected by very similar water contact angle values, lateral force measurements and force distance curves reveal the strong influence of the structure, that is, of the molecular and defect density on the mechanical properties of the SAM. A surprisingly high difference in the resistance of the films to shearing but a similar friction coefficient is found for the two phases indicating a crucial influence of the film structure on the energy dissipation in SAMs. The results highlight the importance of structural effects in the interpretation of surface properties.

KW - STRUCTURAL CHARACTERIZATION

KW - ELECTRICAL-CONDUCTION

KW - THIOL MONOLAYERS

KW - AROMATIC THIOLS

KW - MOLECULAR WIRES

KW - AU(111)

KW - SILVER

KW - SPECTROSCOPY

KW - POLYMORPHISM

KW - STABILITY

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U2 - 10.1021/jp807491t

DO - 10.1021/jp807491t

M3 - Article

SN - 1932-7447

VL - 112

SP - 19465

EP - 19469

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 49

ER -

Friction and Adhesion on Different Phases of a Biphenyl-Alkanethiol Self-Assembled Monolayer on Gold Studied with Scanning Force Microscopy

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Micro-and Nanoelectrode structure: Micro and nanoelectrode structures by template directed electrodeposition

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Friction and Adhesion on Different Phases of a Biphenyl-Alkanethiol Self-Assembled Monolayer on Gold Studied with Scanning Force Microscopy

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Micro-and Nanoelectrode structure: Micro and nanoelectrode structures by template directed electrodeposition

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