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  • UV patterning of polyimide: differentiation and characterization of surface chemistry and structure

    Author(s)
    Blach-Watson, JA
    Watson, GS
    Brown, CL
    Myhra, S
    Griffith University Author(s)
    Myhra, Sverre
    Watson, Jolanta A.
    Brown, Chris L.
    Watson, Gregory S.
    Year published
    2004
    Metadata
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    Abstract
    Self-assembled monolayers (SAMs) of alkanethiols on gold are ideal model systems for studying the emission processes of secondary ions from thin organic layers on metal substrates under keV ion bombardment. In this experimental study, we focus on the emission processes of gold-hexadecanethiolate cluster ions, which are not well understood yet. For this purpose, we carried out time-of-flight secondary ion mass spectrometry (ToF-SIMS) measurements on SAMs of hexadecanethiols (HDT, CH3---(CH2)15---SH) on gold substrates. The gold-hexadecanethiolate cluster ions AuxMy- show intense peaks in mass spectra of negatively charged ...
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    Self-assembled monolayers (SAMs) of alkanethiols on gold are ideal model systems for studying the emission processes of secondary ions from thin organic layers on metal substrates under keV ion bombardment. In this experimental study, we focus on the emission processes of gold-hexadecanethiolate cluster ions, which are not well understood yet. For this purpose, we carried out time-of-flight secondary ion mass spectrometry (ToF-SIMS) measurements on SAMs of hexadecanethiols (HDT, CH3---(CH2)15---SH) on gold substrates. The gold-hexadecanethiolate cluster ions AuxMy- show intense peaks in mass spectra of negatively charged secondary ions under 10 keV Ar+ bombardment. Around the corresponding peaks, a characteristic peak pattern of additional ions is observed. We analyzed the contribution of different cluster ions formed by an attachment or a loss of several hydrogen atoms and their isotope patterns to the individual peaks of the peak pattern. We found two different types of gold-hexadecanethiolate cluster ions. The first type has only one parent ion with no hydrogen atom attached. The second type has two parent ions, one without attachment of hydrogen atoms and another with one additional hydrogen atom. Moreover, we found a universally valid sum formula, which predicts the most intense peak in the peak pattern of all gold-hexadecanethiolate cluster ions analyzed.
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    Journal Title
    Applied Surface Science
    Volume
    235
    DOI
    https://doi.org/10.1016/j.apsusc.2004.05.179
    Subject
    History, heritage and archaeology
    Publication URI
    http://hdl.handle.net/10072/5754
    Collection
    • Journal articles

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