Hierarchical assembly and compliance of aligned nanoscale polymer cylinders in confinement.
We report a combined top-down/bottom-up hierarchical approach to fabricate massively parallel arrays of aligned nanoscale domains by means of the self-assembly of asymmetric polystyrene-block-poly(ethylene-alt-propylene) diblock copolymers. Silicon nitride grating substrates of various depths and periodicities are used to template the alignment of the high-aspect-ratio cylindrical polymer domains. Alignment is nucleated by polystyrene preferentially wetting the trough sidewalls and is thermally extended throughout the polymer film by defect annihilation. Topics discussed include a detailed analysis of the capacity of this system to accommodate lithographic defects and observations of alignment beyond the confined channel volumes. This graphoepitaxial methodology can be exploited in hybrid hard/soft condensed matter systems for a variety of applications.
James Franck Institute, Department of Chemistry, University of Chicago, 5640 South Ellis Avenue, Chicago, Illinois 60637, USA.
Deepak
D
Sundrani
S B
SB
Darling
S J
SJ
Sibener
D018625:Microscopy, Atomic Force; D036103:Nanotechnology; D011095:Polyethylenes / Q000737:chemistry*; D011126:Polypropylenes / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry*; D017655:Silicon Compounds
D011095:Polyethylenes; D011126:Polypropylenes; D011137:Polystyrenes; D017655:Silicon Compounds; C032734:silicon nitride