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

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dc.contributor.author Ghoshal, Tandra
dc.contributor.author Biswas, Subhajit
dc.contributor.author O'Regan, Colm
dc.contributor.author Holmes, Justin D.
dc.contributor.author Morris, Michael A.
dc.date.accessioned 2018-01-26T16:15:47Z
dc.date.available 2018-01-26T16:15:47Z
dc.date.issued 2014-11-18
dc.identifier.citation Ghoshal, 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/s12274-014-0616-7 en
dc.identifier.volume 8 en
dc.identifier.issued 4 en
dc.identifier.startpage 1279 en
dc.identifier.endpage 1292 en
dc.identifier.issn 1998-0124
dc.identifier.uri http://hdl.handle.net/10468/5336
dc.identifier.doi 10.1007/s12274-014-0616-7
dc.description.abstract Thin 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.sponsorship Science Foundation Ireland (Semiconductor Research Corporation Nos. 2011-IN-2194, 09/IN.1/I2602, 12/RC/2278, 09/SIRG/I1621 and CSET CRANN). en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Tsinghua University Press and Springer Verlag 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/s12274-014-0616-7 en
dc.subject Block copolymer en
dc.subject Supercritical CO2 en
dc.subject Self-assembly en
dc.subject Swelling en
dc.subject Nanopores en
dc.title Nanophase separation and structural evolution of block copolymer films: a "green" and "clean" supercritical fluid approach en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Justin D. Holmes, Chemistry, University College Cork, Cork, Ireland. +353-21-490-3000 Email: j.holmes@ucc.ie en
dc.internal.availability Full text available en
dc.date.updated 2018-01-26T13:12:28Z
dc.description.version Submitted Version en
dc.internal.rssid 300940648
dc.contributor.funder Science Foundation Ireland en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Nano Research en
dc.internal.copyrightchecked No !!CORA!! en
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress j.holmes@ucc.ie en
dc.relation.project info:eu-repo/grantAgreement/SFI/SFI Principal Investigator Programme (PI)/09/IN.1/I2602/IE/Novel Nanowire Structures for Devices/ en
dc.relation.project info:eu-repo/grantAgreement/SFI/SFI Research Centres/12/RC/2278/IE/Advanced Materials and BioEngineering Research Centre (AMBER)/ en
dc.relation.project info: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.project info:eu-repo/grantAgreement/SFI/SFI Principal Investigator Programme (PI)/09/IN.1/I2602/IE/Novel Nanowire Structures for Devices/ en
dc.relation.project info: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


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