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    Self-assembly of a 1-eicosanethiolate layer on InSb(100)

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    Appl Surf Sci 2016 InSb thiol ...
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    Author
    Contreras, Yissel
    Muscat, Anthony J. cc
    Affiliation
    University of Arizona
    Issue Date
    2016-05
    Keywords
    Passivation
    Self-assembly
    Liquid phase
    Eicosanethiol
    InSb(100)
    
    Metadata
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    Publisher
    Elsevier
    Citation
    Self-assembly of a 1-eicosanethiolate layer on InSb(100) 2016, 370:67 Applied Surface Science
    Journal
    Applied Surface Science
    Rights
    Copyright © 2016 Elsevier B.V. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    1-eicosanethiolate molecules form relatively weak bonds with the surface of InSb(100) limiting the order of the self-assembled monolayer despite the long length of the alkyl chain. Heating to only 225 °C in vacuum completely desorbed the eicosanethiolate layer from the surface based on x-ray photoelectron spectroscopy. Even after deposition times as long as 20 h in ethanol, the asymmetric methylene stretch was at 2925 cm-1 in the attenuated total reflection Fourier transform infrared spectrum, which is indicative of alkane chains that are incompletely ordered. Atomic force microscopy images combined with ellipsometry showed that the eicosanethiolate layer conformed to the rough InSb(100) starting surface (2.3±0.2 nm RMS). The reoxidation kinetics in air of InSb(100) and InSb(111)B covered with eicosanethiolate layers was the same despite the lower surface roughness of the latter (0.64±0.14 nm). The bond that the S head group makes with the substrate is the primary factor that determines the cohesiveness of the molecules on the surface. Although interactions between the alkane chains in the layer are sufficient to form a self-assembled layer, the fluidity of the molecules in the layer compromised the chemical passivation of the surface resulting in reoxidation in air after 20 minutes.
    Note
    Available online 11 February 2016; 24 month embargo.
    ISSN
    01694332
    DOI
    10.1016/j.apsusc.2016.02.099
    Version
    Final accepted manuscript
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S0169433216302689
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.apsusc.2016.02.099
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