nanopatterning via self-assembly of a lamellar-forming polystyrene-block-poly(dimethylsiloxane) diblock copolymer on topographical substrates fabricated by nanoimprint lithography
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2018
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Abstract
The self-assembly of a lamellar-forming polystyrene-block-poly(dimethylsiloxane) (PS-b-PDMS) diblock copolymer (DBCP) was studied herein for surface nanopatterning. The DBCP was synthesized by sequential living anionic polymerization of styrene and hexamethylcyclotrisiloxane (D3). The number average molecular weight (Mn), polydispersity index (Mw/Mn) and PS volume fraction (φps) of the DBCP were MnPS = 23.0 kg mol−1, MnPDMS = 15.0 kg mol−1, Mw/Mn = 1.06 and φps = 0.6. Thin films of the DBCP were cast and solvent annealed on topographically patterned polyhedral oligomeric silsesquioxane (POSS) substrates. The lamellae repeat distance or pitch (λL) and the width of the PDMS features (dL) are ~35 nm and ~17 nm, respectively, as determined by SEM. The chemistry of the POSS substrates was tuned, and the effects on the self-assembly of the DBCP noted. The PDMS nanopatterns were used as etching mask in order to transfer the DBCP pattern to underlying silicon substrate by a complex plasma etch process yielding sub-15 nm silicon features.
| Reference Key |
borah2018nanomaterialsnanopatterning
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| Authors | ;Dipu Borah;Cian Cummins;Sozaraj Rasappa;Ramsankar Senthamaraikannan;Mathieu Salaun;Marc Zelsmann;George Liontos;Konstantinos Ntetsikas;Apostolos Avgeropoulos;Michael A. Morris |
| Journal | progress in neuro-psychopharmacology & biological psychiatry |
| Year | 2018 |
| DOI |
10.3390/nano8010032
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