Hydrophilic surfaces via the self-assembly of nitrile-terminated alkanethiols on gold

Chul Soon Park; Oussama Zenasni; Maria D. Marquez; H. Justin Moore; T. Randall Lee; Chul Soon Park; Oussama Zenasni; Maria D. Marquez; H. Justin Moore; T. Randall Lee

doi:10.3934/matersci.2018.2.171

AIMS Materials Science

2018, Volume 5, Issue 2: 171-189. doi: 10.3934/matersci.2018.2.171

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Hydrophilic surfaces via the self-assembly of nitrile-terminated alkanethiols on gold

1.
Departments of Chemistry and Chemical Engineering and the Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, United States
2.
Department of Chemistry, University of Texas Rio Grande Valley, One West University Blvd., Brownsville, Texas 78520, United States

Received: 12 December 2017 Accepted: 22 February 2018 Published: 06 March 2018

A series of CN-terminated alkanethiols were synthesized and used to generate self-assembled monolayers (SAMs) on gold. The SAMs were characterized using ellipsometry, contact angle goniometry, polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS), and X-ray photoelectron spectroscopy (XPS). The SAMs were compared to those derived from a series of analogous CH₃-terminated alkanethiols. The CN-terminated SAMs exhibited lower film thicknesses than the CH₃-terminated SAMs, which was largely due to their greater tilt angle on the surface. Additionally, the CN-terminated SAMs form well-ordered films on flat gold surfaces with relative packing densities being indistinguishable from the CH₃-terminated SAMs. The CN-terminated SAMs exhibited a less hydrophobic character than the SAMs derived from CH₃-terminated adsorbates, which was attributed to the dipole moment of the terminal group as well as the lone pair of the nitrogen atom of the CN-terminal group.
- self-assembled monolayers; CN-terminated; contact angles; hydrophilic surfaces
Citation: Chul Soon Park, Oussama Zenasni, Maria D. Marquez, H. Justin Moore, T. Randall Lee. Hydrophilic surfaces via the self-assembly of nitrile-terminated alkanethiols on gold[J]. AIMS Materials Science, 2018, 5(2): 171-189. doi: 10.3934/matersci.2018.2.171

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Abstract

A series of CN-terminated alkanethiols were synthesized and used to generate self-assembled monolayers (SAMs) on gold. The SAMs were characterized using ellipsometry, contact angle goniometry, polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS), and X-ray photoelectron spectroscopy (XPS). The SAMs were compared to those derived from a series of analogous CH₃-terminated alkanethiols. The CN-terminated SAMs exhibited lower film thicknesses than the CH₃-terminated SAMs, which was largely due to their greater tilt angle on the surface. Additionally, the CN-terminated SAMs form well-ordered films on flat gold surfaces with relative packing densities being indistinguishable from the CH₃-terminated SAMs. The CN-terminated SAMs exhibited a less hydrophobic character than the SAMs derived from CH₃-terminated adsorbates, which was attributed to the dipole moment of the terminal group as well as the lone pair of the nitrogen atom of the CN-terminal group.

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