Surface damage characteristics of self-assembled monolayers of alkanethiols on metal surfaces

I. H. Sung, Dae Eun Kim

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The effect of metal oxide layer on the nano-tribological characteristics of single chain alkanethiol CH3(CH2)nSH) self-assembled monolayers (SAMs) on various metal surfaces (gold, silver, copper) was investigated. In order to correlate the surface structures with the tribological characteristics, various surface analysis techniques such as Scanning Probe Microscopy, X-ray Photoelectron Spectroscopy, Secondary Ion Mass Spectrometry and Spectroscopic Ellipsometry were used. Results of surface analyses showed that thiols on a metal surface were susceptible to forming multilayers if the metal surface was oxidized before the thiol assembly process. From the friction and wear tests conducted using an Atomic Force Microscope and a Lateral Force Microscope, it was found that thiols on copper oxide surface could be easily removed even under a few nano-Newton normal load. On the other hand, thiols on gold and copper fresh surfaces (the surface which was made by minimizing oxide formation) could endure up to micro-Newton level loads. Based on these findings, it could be concluded that the nano-tribological characteristics of alkanethiol SAMs on various metal surfaces were largely dependent on the oxide layer that already formed on the metal surface before the thiol adsorption process.

Original languageEnglish
Pages (from-to)835-844
Number of pages10
JournalTribology Letters
Volume17
Issue number4
DOIs
Publication statusPublished - 2004 Nov 1

Fingerprint

Self assembled monolayers
metal surfaces
thiols
Metals
damage
Sulfhydryl Compounds
Oxides
newton
microscopes
gold
Gold
copper
oxides
wear tests
Copper
Microscopes
copper oxides
secondary ion mass spectrometry
ellipsometry
metal oxides

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

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abstract = "The effect of metal oxide layer on the nano-tribological characteristics of single chain alkanethiol CH3(CH2)nSH) self-assembled monolayers (SAMs) on various metal surfaces (gold, silver, copper) was investigated. In order to correlate the surface structures with the tribological characteristics, various surface analysis techniques such as Scanning Probe Microscopy, X-ray Photoelectron Spectroscopy, Secondary Ion Mass Spectrometry and Spectroscopic Ellipsometry were used. Results of surface analyses showed that thiols on a metal surface were susceptible to forming multilayers if the metal surface was oxidized before the thiol assembly process. From the friction and wear tests conducted using an Atomic Force Microscope and a Lateral Force Microscope, it was found that thiols on copper oxide surface could be easily removed even under a few nano-Newton normal load. On the other hand, thiols on gold and copper fresh surfaces (the surface which was made by minimizing oxide formation) could endure up to micro-Newton level loads. Based on these findings, it could be concluded that the nano-tribological characteristics of alkanethiol SAMs on various metal surfaces were largely dependent on the oxide layer that already formed on the metal surface before the thiol adsorption process.",
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Surface damage characteristics of self-assembled monolayers of alkanethiols on metal surfaces. / Sung, I. H.; Kim, Dae Eun.

In: Tribology Letters, Vol. 17, No. 4, 01.11.2004, p. 835-844.

Research output: Contribution to journalArticle

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