Preconditioning gold substrates influences organothiol self-assembled monolayer (SAM) formation

Meng Yen Tsai, Jui Che Lin

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Self-assembled monolayer (SAM) formation of alkanethiols with ionic, hydrophilic terminal functionalities onto various O2 plasma/ethanol pretreated gold substrates was characterized to explore the effect of gold surface oxide on the SAM packing quality. Oxygen adsorption induced by the Au2O3 surface residuals are observed on the plasma-oxidized and O2 plasma/ethanol-rinsed pretreated Au surfaces while no obvious adsorbed oxygen is found on freshly coated and O2 plasma/ethanol sonication pretreated Au substrates. A model for the formation of hydrophilic terminated SAMs, -OH, -COOH, and -PO3H2 is proposed. According to this model, the ionic and/or other binding interactions between the surface Au2O3 and the alkanethiol hydrophilic terminal end as well as the interactions between the terminal SAM functionalities could cause the packing disorder found on these three SAMs formed on Au substrates containing Au2O3 surface species.

Original languageEnglish
Pages (from-to)259-266
Number of pages8
JournalJournal of Colloid And Interface Science
Volume238
Issue number2
DOIs
Publication statusPublished - 2001 Jun 15

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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