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Author

Park, Soojin
Nano-Functional Materials Lab
Research Interests
  • Block Copolymers, nanostructured materials for Lithium-Ion batteries, wearable and stretchable energy storage applications

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Unidirectionally aligned line patterns driven by entropic effects on faceted surfaces

Cited 28 times inthomson ciCited 26 times inthomson ci
Title
Unidirectionally aligned line patterns driven by entropic effects on faceted surfaces
Author
Hong, Sung WooHuh, JuneGu, XiaodanLee, Dong HyunJo, Won HoPark, SoojinXu, TingRussell, Thomas P.
Keywords
Block copolymer; Directed self-assembly; Long-range order; Pattern transfer
Issue Date
201201
Publisher
NATL ACAD SCIENCES
Citation
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, v.109, no.5, pp.1402 - 1406
Abstract
A simple, versatile approach to the directed self-assembly of block copolymers into a macroscopic array of unidirectionally aligned cylindrical microdomains on reconstructed faceted single crystal surfaces or on flexible, inexpensive polymeric replicas was discovered. High fidelity transfer of the line pattern generated from the microdomains to a master mold is also shown. A single-grained line patterns over arbitrarily large surface areas without the use of top-down techniques is demonstrated, which has an order parameter typically in excess of 0.97 and a slope error of 1.1 deg. This degree of perfection, produced in a short time period, has yet to be achieved by any other methods. The exceptional alignment arises from entropic penalties of chain packing in the facets coupled with the bending modulus of the cylindrical microdomains. This is shown, theoretically, to be the lowest energy state. The atomic crystalline ordering of the substrate is transferred, over multiple length scales, to the block copolymer microdomains, opening avenues to large-scale roll-to-roll type and nanoimprint processing of perfectly patterned surfaces and as templates and scaffolds for magnetic storage media, polarizing devices, and nanowire arrays.
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DOI
http://dx.doi.org/10.1073/pnas.1115803109
ISSN
0027-8424
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