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Comparison of plasma polymerization under collisional and collision-less pressure regimes

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dc.contributor.authorSaboohi, S.
dc.contributor.authorJasieniak, M.
dc.contributor.authorCoad, B.
dc.contributor.authorGriesser, H.
dc.contributor.authorShort, R.
dc.contributor.authorMichelmore, A.
dc.date.issued2015
dc.description.abstractWhile plasma polymerization is used extensively to fabricate functionalized surfaces, the processes leading to plasma polymer growth are not yet completely understood. Thus, reproducing processes in different reactors has remained problematic, which hinders industrial uptake and research progress. Here we examine the crucial role pressure plays in the physical and chemical processes in the plasma phase, in interactions at surfaces in contact with the plasma phase, and how this affects the chemistry of the resulting plasma polymer films using ethanol as the gas precursor. Visual inspection of the plasma reveals a change from intense homogeneous plasma at low pressure to lower intensity bulk plasma at high pressure, but with increased intensity near the walls of the chamber. It is demonstrated that this occurs at the transition from a collision-less to a collisional plasma sheath, which in turn increases ion and energy flux to surfaces at constant RF power. Surface analysis of the resulting plasma polymer films show that increasing the pressure results in increased incorporation of oxygen and lower crosslinking, parameters which are critical to film performance. These results and insights help to explain the considerable differences in plasma polymer properties observed by different research groups using nominally similar processes.
dc.description.statementofresponsibilitySolmaz Saboohi, Marek Jasieniak, Bryan R. Coad, Hans J. Griesser, Robert D. Short and Andrew Michelmore
dc.identifier.citationJournal of Physical Chemistry B, 2015; 119(49):15359-15369
dc.identifier.doi10.1021/acs.jpcb.5b07309
dc.identifier.issn1520-6106
dc.identifier.issn1520-5207
dc.identifier.orcidCoad, B. [0000-0003-3297-3977]
dc.identifier.urihttp://hdl.handle.net/2440/112597
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.rights© 2015 American Chemical Society
dc.source.urihttps://doi.org/10.1021/acs.jpcb.5b07309
dc.subjectplasma polymerization
dc.subjectcollision
dc.titleComparison of plasma polymerization under collisional and collision-less pressure regimes
dc.typeJournal article
pubs.publication-statusPublished

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