Reordering transitions during annealing of block copolymer cylinder phases

Majewski, Pawel W.; Yager, Kevin G.

doi:10.1039/C5SM02441B

Title: Reordering transitions during annealing of block copolymer cylinder phases

Journal Article · Tue Oct 06 00:00:00 EDT 2015 · Soft Matter

DOI: https://doi.org/10.1039/C5SM02441B · OSTI ID:1224781

Majewski, Pawel W. ^[1]; Yager, Kevin G. ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States)

While equilibrium block-copolymer morphologies are dictated by energy-minimization effects, the semi-ordered states observed experimentally often depend on the details of ordering pathways and kinetics. In this study, we explore reordering transitions in thin films of block-copolymer cylinder-forming polystyrene-block-poly(methyl methacrylate). We observe several transient states as films order towards horizontally-aligned cylinders. In particular, there is an early-stage reorganization from randomly-packed cylinders into hexagonally-packed vertically-aligned cylinders; followed by a reorientation transition from vertical to horizontal cylinder states. These transitions are thermally activated. The growth of horizontal grains within an otherwise vertical morphology proceeds anisotropically, resulting in anisotropic grains in the final horizontal state. The size, shape, and anisotropy of grains are influenced by ordering history; for instance, faster heating rates reduce grain anisotropy. These results help elucidate aspects of pathway-dependent ordering in block-copolymer thin films.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

OSTI ID:: 1224781

Report Number(s):: BNL--108516-2015-JA; KC0403020

Journal Information:: Soft Matter, Journal Name: Soft Matter; ISSN SMOABF; ISSN 1744-683X

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Photothermally Directed Assembly of Block Copolymers Nowak, Samantha R.; Yager, Kevin G. Advanced Materials Interfaces, Vol. 7, Issue 5 https://doi.org/10.1002/admi.201901679	journal	December 2019
Controlling the Pore Size of Mesoporous Carbon Thin Films through Thermal and Solvent Annealing Zhou, Zhengping; Liu, Guoliang Small, Vol. 13, Issue 15 https://doi.org/10.1002/smll.201603107	journal	February 2017
Hierarchical nanopores formed by block copolymer lithography on the surfaces of different materials pre-patterned by nanosphere lithography Brassat, Katharina; Kool, Daniel; Bürger, Julius Nanoscale, Vol. 10, Issue 21 https://doi.org/10.1039/c8nr01397g	journal	January 2018
Self-assembly of a silicon-containing side-chain liquid crystalline block copolymer in bulk and in thin films: kinetic pathway of a cylinder to sphere transition Liao, Fen; Shi, Ling-Ying; Cheng, Li-Chen Nanoscale, Vol. 11, Issue 1 https://doi.org/10.1039/c8nr07685e	journal	January 2019
Automated solvent vapor annealing with nanometer scale control of film swelling for block copolymer thin films Hulkkonen, Hanna; Salminen, Turkka; Niemi, Tapio Soft Matter, Vol. 15, Issue 39 https://doi.org/10.1039/c9sm01322a	journal	January 2019
Rapid ordering of block copolymer thin films Majewski, Pawel W.; Yager, Kevin G. Journal of Physics: Condensed Matter, Vol. 28, Issue 40 https://doi.org/10.1088/0953-8984/28/40/403002	journal	August 2016
Review—Recent Advances in Block-Copolymer Nanostructured Subwavelength Antireflective Surfaces Mir, Sajjad Husain; Rydzek, Gaulthier; Nagahara, Larry Akio Journal of The Electrochemical Society, Vol. 167, Issue 3 https://doi.org/10.1149/2.0022003jes	journal	September 2019

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