Valence band structure of PDMS surface and a blend with MWCNTs:A UPS and MIES study of an insulating polymer

Natalya Schmerl, Dmitriy Khodakov, Andrew Stapleton, Amanda Ellis, Gunther Andersson

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    The use of polydimethylsiloxane (PDMS) is increasing with new technologies working toward compact, flexible and transparent devices for use in medical and microfluidic systems. Electronic characterization of PDMS and other insulating materials is difficult due to charging, yet necessary for many applications where the interfacial structure is vital to device function or further modification. The outermost layer in particular is of importance as this is the area where chemical reactions such as surface functionalization will occur. Here, we investigate the valence band structure of the outermost layer and near surface area of PDMS through the use of metastable induced photoelectron spectroscopy (MIES) paired with ultraviolet photoelectron spectroscopy (UPS). The chemical composition of the samples under investigation were measured via X-ray photoelectron spectroscopy (XPS), and the vertical distribution of the polymer was shown with neutral impact collision ion scattering spectroscopy (NICISS). Three separate methods for charge compensation are used for the samples, and their effectiveness is compared.

    Original languageEnglish
    Pages (from-to)693-699
    Number of pages7
    JournalApplied Surface Science
    Volume353
    DOIs
    Publication statusPublished - 2015

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