Nanophase separation and structural evolution of block copolymer films: a "green" and "clean" supercritical fluid approach

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dc.contributor.authorGhoshal, Tandra
dc.contributor.authorBiswas, Subhajit
dc.contributor.authorO'Regan, Colm
dc.contributor.authorHolmes, Justin D.
dc.contributor.authorMorris, Michael A.
dc.contributor.funderScience Foundation Irelanden
dc.date.accessioned2018-01-26T16:15:47Z
dc.date.available2018-01-26T16:15:47Z
dc.date.issued2014-11-18
dc.date.updated2018-01-26T13:12:28Z
dc.description.abstractThin films of block copolymers (BCPs) are widely accepted as potentially important materials in a host of technological applications including nanolithography. In order to induce domain separation and form well-defined structural arrangements, many of these are solvent-annealed (i.e. solvent swollen) at moderate temperatures. The use of solvents can be challenging in industry from an environmental point of view as well as having practical/cost issues. However, a simple and environmentally friendly alternative to solvo-thermal annealing for the periodically ordered nanoscale phase separated structures is described herein. Various asymmetric polystyrene-b-poly(ethylene oxide) (PS-b-PEO) thin films were annealed in a compressible fluid, supercritical carbon dioxide (scCO2), to control nanodomain orientation and surface morphologies. For the first time, periodic well defined, hexagonally ordered films with sub-25 nm pitch size were demonstrated using a supercritical fluid (SCF) process at low temperatures and pressures. Predominant swelling of PEO domains in scCO2 induces nanophase separation. scCO2 serves as green alternative to the conventional organic solvents for the phase segregation of BCPs with complete elimination of any residual solvent in the patterned film. The depressurization rate of scCO2 following annealing was found to affect the morphology of the films. The supercritical annealing conditions could be used to define nanoporous analogues of the microphase separated films without additional processing, providing a one-step route to membrane like structures without affecting the ordered surface phase segregated structure. An understanding of the BCP self-assembly mechanism can be realized in terms of the deviation in glass transition temperature, melting point, viscosity, interaction parameter and volume fraction of the constituent blocks in the scCO2 environment.en
dc.description.sponsorshipScience Foundation Ireland (Semiconductor Research Corporation Nos. 2011-IN-2194, 09/IN.1/I2602, 12/RC/2278, 09/SIRG/I1621 and CSET CRANN).en
dc.description.statusPeer revieweden
dc.description.versionSubmitted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationGhoshal, T., Biswas, S., O’Regan, C., Holmes, J. D. and Morris, M. A. (2015) 'Nanophase separation and structural evolution of block copolymer films: A “green” and “clean” supercritical fluid approach', Nano Research, 8(4), pp. 1279-1292. doi: 10.1007/s12274-014-0616-7en
dc.identifier.doi10.1007/s12274-014-0616-7
dc.identifier.endpage1292en
dc.identifier.issn1998-0124
dc.identifier.issued4en
dc.identifier.journaltitleNano Researchen
dc.identifier.startpage1279en
dc.identifier.urihttps://hdl.handle.net/10468/5336
dc.identifier.volume8en
dc.language.isoenen
dc.publisherTsinghua University Press and Springer Verlagen
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Principal Investigator Programme (PI)/09/IN.1/I2602/IE/Novel Nanowire Structures for Devices/en
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Research Centres/12/RC/2278/IE/Advanced Materials and BioEngineering Research Centre (AMBER)/en
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Starting Investigator Research Grant (SIRG)/09/SIRG/I1621/IE/Tuning surface and dopant properties of silicon and germanium nanowires for high performance nanowire-based field-effect transistors/en
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Principal Investigator Programme (PI)/09/IN.1/I2602/IE/Novel Nanowire Structures for Devices/en
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Centre for Science Engineering and Technology (CSET)/02/CE.1/I142/IE/CSET CRANN: Centre for Research on Adaptive Nanostructures and Nanodevices/en
dc.rights© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2014. This is a pre-print of an article published in Nano Research. The final authenticated version is available online at: https://doi.org/10.1007/s12274-014-0616-7en
dc.subjectBlock copolymeren
dc.subjectSupercritical CO2en
dc.subjectSelf-assemblyen
dc.subjectSwellingen
dc.subjectNanoporesen
dc.titleNanophase separation and structural evolution of block copolymer films: a "green" and "clean" supercritical fluid approachen
dc.typeArticle (peer-reviewed)en
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