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

Meng Yen Tsai; Jui Che Lin

doi:10.1006/jcis.2001.7522

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

Meng Yen Tsai, Jui Che Lin

Department of Chemical Engineering

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

28 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 language	English
Pages (from-to)	259-266
Number of pages	8
Journal	Journal of Colloid And Interface Science
Volume	238
Issue number	2
DOIs	https://doi.org/10.1006/jcis.2001.7522
Publication status	Published - 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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10.1006/jcis.2001.7522

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title = "Preconditioning gold substrates influences organothiol self-assembled monolayer (SAM) formation",

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.",

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journal = "Journal of Colloid And Interface Science",

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T1 - Preconditioning gold substrates influences organothiol self-assembled monolayer (SAM) formation

AU - Tsai, Meng Yen

AU - Lin, Jui Che

PY - 2001/6/15

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N2 - 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.

AB - 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.

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

Abstract

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