Structural evolution of nanophase separated block copolymer patterns in supercritical CO2.

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dc.contributor.authorGhoshal, Tandra
dc.contributor.authorCollins, Timothy W.
dc.contributor.authorBiswas, Subhajit
dc.contributor.authorMorris, Michael A.
dc.contributor.authorHolmes, Justin D.
dc.contributor.funderScience Foundation Irelanden
dc.date.accessioned2021-05-18T15:09:44Z
dc.date.available2021-05-18T15:09:44Z
dc.date.issued2021-03-08
dc.date.updated2021-05-18T10:53:27Z
dc.description.abstractNanopatterns can readily be formed by annealing block copolymers (BCPs) in organic solvents at moderate or high temperatures. However, this approach can be challenging from an environmental and industrial point of view. Herein, we describe a simple and environmentally friendly alternative to achieve periodically ordered nanoscale phase separated BCP structures. Asymmetric polystyrene-b-poly(ethylene oxide) (PS-b-PEO) thin film patterns of different molecular weight were achieved by annealing in supercritical carbon dioxide (sc-CO2). Microphase separation of PS-b-PEO (16,000–5000) film patterns were achieved by annealing in scCO2 at a relatively low temperature was previously reported by our group. The effects of annealing temperature, time and depressurisation rates for the polymer system were also discussed. In this article, we have expanded this study to create new knowledge on the structural and dimensional evolution of nanohole and line/space surface periodicity of four other different molecular weights PS-b-PEO systems. Periodic, well defined, hexagonally ordered films of line and hole patterns were obtained at low CO2 temperatures (35–40 °C) and pressures (1200–1300 psi). Further, the changes in morphology, ordering and feature sizes for a new PS-b-PEO system (42,000–11,500) are discussed in detail upon changing the scCO2 annealing parameters (temperature, film thickness, depressurization rates, etc.). In relation to our previous reports, the broad annealing temperature and depressurisation rate were explored together for different film thicknesses. In addition, the effects of SCF annealing for three other BCP systems (PEO-b-PS, PS-b-PDMS, PS-b-PLA) is also investigated with similar processing conditions. The patterns were also generated on a graphoepitaxial substrate for device application.en
dc.description.sponsorshipScience Foundation Ireland (16/TIDA/4218 and 12/RC/2278).en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid669en
dc.identifier.citationGhoshal, T., Collins, T. W., Biswas, S., A. Morris, M. and Holmes, J. D. (2021) 'Structural Evolution of Nanophase Separated Block Copolymer Patterns in Supercritical CO2', Nanomaterials, 11 (3), 669 (15 pp). doi: 10.3390/nano11030669en
dc.identifier.doi10.3390/nano11030669en
dc.identifier.endpage15en
dc.identifier.issn2079-4991
dc.identifier.issued3en
dc.identifier.journaltitleJournal of Nanomaterialsen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/11351
dc.identifier.volume11en
dc.language.isoenen
dc.publisherMDPIen
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Research Centres/12/RC/2278/IE/Advanced Materials and BioEngineering Research Centre (AMBER)/en
dc.relation.urihttps://www.mdpi.com/2079-4991/11/3/669
dc.rights© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).en
dc.rights.urihttps:// creativecommons.org/licenses/by/4.0/en
dc.subjectBlock copolymeren
dc.subjectscCO2 annealingen
dc.subjectMicrophase separationen
dc.subjectStructural evolutionen
dc.subjectFeature size variationen
dc.titleStructural evolution of nanophase separated block copolymer patterns in supercritical CO2.en
dc.typeArticle (peer-reviewed)en
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