An adhesive study by electron tunnelling

Ethyl α-cyanoacrylate adsorbed on an oxidized aluminium surface

S. Reynolds, D. P. Oxley, R. G. Pritchard

    Research output: Contribution to journalArticle

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    Abstract

    The interfacial properties of an adhesive system, ethyl a-cyanoacrylate/aluminium, are investigated by the adsorption of a thin adhesive layer upon the Al oxide insulator of an Al?Pb tunnel junction. Such junctions exhibit electrical properties determined in part by the physical and chemical nature of the adsorbed layer. Inelastic electron tunnelling spectra, and resistance and capacitance data are presented which indicate that exposure of the oxide to pure adhesive vapour produces an inhomogeneous adsorbed layer, which increases in overall thickness with increasing vapour exposure time. By retarding vapour polymerization, a more uniform layer is adsorbed, whose thickness is less strongly dependent on exposure time. Tunnelling spectra agree well with those obtained using bulk i.r. spectroscopy (which are also presented here), allowing IET vibrational mode assignments to be inferred. Shifts in C?O and C?O-stretching frequencies are observed in the tunnelling spectrum of the uniform layer which have been attributed by other workers using a reflectance i.r. technique to adhesive hydrogen bonding at the oxide surface. The absence of C?C and ?CH2 modes in the tunnelling spectra is indicative of cyanoacrylate polymerization at the monomolecular level. A chemical model of the interface based on this, and on peak intensity data, is presented.
    Original languageEnglish
    Pages (from-to)103-111
    Number of pages9
    JournalSpectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
    Volume38
    Issue number1
    DOIs
    Publication statusPublished - 1982

    Fingerprint

    Electron tunneling
    electron tunneling
    Aluminum
    adhesives
    Adhesives
    Oxides
    Cyanoacrylates
    aluminum
    Vapors
    vapors
    Polymerization
    oxides
    polymerization
    Tunnel junctions
    Stretching
    Hydrogen bonds
    Electric properties
    Capacitance
    tunnel junctions
    Spectroscopy

    Cite this

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    title = "An adhesive study by electron tunnelling: Ethyl α-cyanoacrylate adsorbed on an oxidized aluminium surface",
    abstract = "The interfacial properties of an adhesive system, ethyl a-cyanoacrylate/aluminium, are investigated by the adsorption of a thin adhesive layer upon the Al oxide insulator of an Al?Pb tunnel junction. Such junctions exhibit electrical properties determined in part by the physical and chemical nature of the adsorbed layer. Inelastic electron tunnelling spectra, and resistance and capacitance data are presented which indicate that exposure of the oxide to pure adhesive vapour produces an inhomogeneous adsorbed layer, which increases in overall thickness with increasing vapour exposure time. By retarding vapour polymerization, a more uniform layer is adsorbed, whose thickness is less strongly dependent on exposure time. Tunnelling spectra agree well with those obtained using bulk i.r. spectroscopy (which are also presented here), allowing IET vibrational mode assignments to be inferred. Shifts in C?O and C?O-stretching frequencies are observed in the tunnelling spectrum of the uniform layer which have been attributed by other workers using a reflectance i.r. technique to adhesive hydrogen bonding at the oxide surface. The absence of C?C and ?CH2 modes in the tunnelling spectra is indicative of cyanoacrylate polymerization at the monomolecular level. A chemical model of the interface based on this, and on peak intensity data, is presented.",
    author = "S. Reynolds and Oxley, {D. P.} and Pritchard, {R. G.}",
    year = "1982",
    doi = "10.1016/0584-8539(82)80183-9",
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    An adhesive study by electron tunnelling : Ethyl α-cyanoacrylate adsorbed on an oxidized aluminium surface. / Reynolds, S.; Oxley, D. P.; Pritchard, R. G.

    In: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Vol. 38, No. 1, 1982, p. 103-111.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - An adhesive study by electron tunnelling

    T2 - Ethyl α-cyanoacrylate adsorbed on an oxidized aluminium surface

    AU - Reynolds, S.

    AU - Oxley, D. P.

    AU - Pritchard, R. G.

    PY - 1982

    Y1 - 1982

    N2 - The interfacial properties of an adhesive system, ethyl a-cyanoacrylate/aluminium, are investigated by the adsorption of a thin adhesive layer upon the Al oxide insulator of an Al?Pb tunnel junction. Such junctions exhibit electrical properties determined in part by the physical and chemical nature of the adsorbed layer. Inelastic electron tunnelling spectra, and resistance and capacitance data are presented which indicate that exposure of the oxide to pure adhesive vapour produces an inhomogeneous adsorbed layer, which increases in overall thickness with increasing vapour exposure time. By retarding vapour polymerization, a more uniform layer is adsorbed, whose thickness is less strongly dependent on exposure time. Tunnelling spectra agree well with those obtained using bulk i.r. spectroscopy (which are also presented here), allowing IET vibrational mode assignments to be inferred. Shifts in C?O and C?O-stretching frequencies are observed in the tunnelling spectrum of the uniform layer which have been attributed by other workers using a reflectance i.r. technique to adhesive hydrogen bonding at the oxide surface. The absence of C?C and ?CH2 modes in the tunnelling spectra is indicative of cyanoacrylate polymerization at the monomolecular level. A chemical model of the interface based on this, and on peak intensity data, is presented.

    AB - The interfacial properties of an adhesive system, ethyl a-cyanoacrylate/aluminium, are investigated by the adsorption of a thin adhesive layer upon the Al oxide insulator of an Al?Pb tunnel junction. Such junctions exhibit electrical properties determined in part by the physical and chemical nature of the adsorbed layer. Inelastic electron tunnelling spectra, and resistance and capacitance data are presented which indicate that exposure of the oxide to pure adhesive vapour produces an inhomogeneous adsorbed layer, which increases in overall thickness with increasing vapour exposure time. By retarding vapour polymerization, a more uniform layer is adsorbed, whose thickness is less strongly dependent on exposure time. Tunnelling spectra agree well with those obtained using bulk i.r. spectroscopy (which are also presented here), allowing IET vibrational mode assignments to be inferred. Shifts in C?O and C?O-stretching frequencies are observed in the tunnelling spectrum of the uniform layer which have been attributed by other workers using a reflectance i.r. technique to adhesive hydrogen bonding at the oxide surface. The absence of C?C and ?CH2 modes in the tunnelling spectra is indicative of cyanoacrylate polymerization at the monomolecular level. A chemical model of the interface based on this, and on peak intensity data, is presented.

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    M3 - Article

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    JO - Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy

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