Orientation of cylinder-forming poly(styrene)-poly(nhexylmethacrylate) diblock thin films pre-and post-shear

Raleigh L. Davis, Richard A. Register, Paul M. Chaikin

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Block copolymer thin films provide an attractive method for nanopatterning at size scales inaccessible to conventional photolithographic techniques.1 Block copolymers can microphase separate to form dense, periodic microdomains on the size scale of 10-100 nm.2 To serve effectively as templates, however, the need to impart well-defined positional and orientational order to these microdomains is paramount. One method to achieve long-range orientational order in block copolymer thin films is through the use of shear, which has previously been shown to preferentially orient the microdomains of certain sphere-3, cylinder-4, and lamellae-forming5 systems in the direction of applied shear. Numerous experimental factors influence the ease with which orientation is achieved as well as the ultimate quality of alignment observed. The present work aims to investigate several of these factors by studying the thin film morphology, in both the unaligned (thermally annealed) and shear-aligned states, of cylinder-forming poly(styrene)- poly(n-hexylmethacrylate) (PS-PHMA) copolymers which are of interest for nanolithographic applications such as the production of nanowire polarizing grids for deep ultraviolet light.6 The tendency of PS-PHMA diblocks not to terrace (form "islands" or "holes") at reasonable annealing conditions, but instead to form mixed morphological patterns (mixtures of in-plane and out-of-plane cylinders or spheres) without discrete variation in film thickness makes it challenging to identify the precise monolayer film thickness at which maximum alignment quality is expected to occur. Furthermore, we investigate the effect of block copolymer composition on these thickness dependencies; in particular, we expect that moving the polymer more firmly into the cylinder-forming phase space might reduce the ability of the microdomains to restructure into spheres, and thus dampen the degree to which orientational switching between inplane and out-of-plane cylinders is possible. Once the optimal integer layer film thicknesses are identified we subsequently examine both the limitations to the maximum achievable alignment quality as well as the ease with which these systems are aligned (by looking at alignment quality as a function of applied shear).

    Original languageEnglish (US)
    Title of host publicationMaterials Engineering and Sciences Division 2014 - Core Programming Area at the 2014 AIChE Annual Meeting
    PublisherAIChE
    Pages532-534
    Number of pages3
    ISBN (Electronic)9781510812642
    StatePublished - 2014
    EventMaterials Engineering and Sciences Division 2014 - Core Programming Area at the 2014 AIChE Annual Meeting - Atlanta, United States
    Duration: Nov 16 2014Nov 21 2014

    Other

    OtherMaterials Engineering and Sciences Division 2014 - Core Programming Area at the 2014 AIChE Annual Meeting
    CountryUnited States
    CityAtlanta
    Period11/16/1411/21/14

    Fingerprint

    Styrene
    Block copolymers
    Film thickness
    Thin films
    Nanowires
    Monolayers
    Polymers
    Copolymers
    Annealing
    Chemical analysis

    ASJC Scopus subject areas

    • Engineering(all)
    • Chemical Engineering(all)
    • Materials Science(all)

    Cite this

    Davis, R. L., Register, R. A., & Chaikin, P. M. (2014). Orientation of cylinder-forming poly(styrene)-poly(nhexylmethacrylate) diblock thin films pre-and post-shear. In Materials Engineering and Sciences Division 2014 - Core Programming Area at the 2014 AIChE Annual Meeting (pp. 532-534). AIChE.

    Orientation of cylinder-forming poly(styrene)-poly(nhexylmethacrylate) diblock thin films pre-and post-shear. / Davis, Raleigh L.; Register, Richard A.; Chaikin, Paul M.

    Materials Engineering and Sciences Division 2014 - Core Programming Area at the 2014 AIChE Annual Meeting. AIChE, 2014. p. 532-534.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Davis, RL, Register, RA & Chaikin, PM 2014, Orientation of cylinder-forming poly(styrene)-poly(nhexylmethacrylate) diblock thin films pre-and post-shear. in Materials Engineering and Sciences Division 2014 - Core Programming Area at the 2014 AIChE Annual Meeting. AIChE, pp. 532-534, Materials Engineering and Sciences Division 2014 - Core Programming Area at the 2014 AIChE Annual Meeting, Atlanta, United States, 11/16/14.
    Davis RL, Register RA, Chaikin PM. Orientation of cylinder-forming poly(styrene)-poly(nhexylmethacrylate) diblock thin films pre-and post-shear. In Materials Engineering and Sciences Division 2014 - Core Programming Area at the 2014 AIChE Annual Meeting. AIChE. 2014. p. 532-534
    Davis, Raleigh L. ; Register, Richard A. ; Chaikin, Paul M. / Orientation of cylinder-forming poly(styrene)-poly(nhexylmethacrylate) diblock thin films pre-and post-shear. Materials Engineering and Sciences Division 2014 - Core Programming Area at the 2014 AIChE Annual Meeting. AIChE, 2014. pp. 532-534
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