Assembly structure and rod orientation of rod–coil diblock copolymer films

Su, Ya-Juan; Ma, Ze-Xin; Huang, Jianhua

doi:10.1038/pj.2016.47

Cited by 1 publication

(2 citation statements)

References 37 publications

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“…24 For films of rod−coil LC BCPs, anchoring of the LC relative to the substrate can affect the orientation of the lamellar or cylindrical microdomains. 41,42 Apart from experimental investigations of the molecular adsorption of rod−coil BCPs on substrates, 41,43,44 much of the research on thin film self-assembly and directed self-assembly of rod−coil BCPs has been based on simulations 45,46 and experimental investigations of the thin film microdomain ordering and directed self-assembly of rod− coil BCPs remain sparse.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Due to the two competing processes of liquid crystalline ordering and microphase separation in the LC BCPs, one approach to achieve alignment of the microdomains in the LC BCPs thin films is to control the ordering and orientation of the LC mesogens. − For example, the application of external fields to achieve LC orientation of the side chains can induce macroscopic orientation of the BCP microdomains . For films of rod–coil LC BCPs, anchoring of the LC relative to the substrate can affect the orientation of the lamellar or cylindrical microdomains. , Apart from experimental investigations of the molecular adsorption of rod–coil BCPs on substrates, ,, much of the research on thin film self-assembly and directed self-assembly of rod–coil BCPs has been based on simulations , and experimental investigations of the thin film microdomain ordering and directed self-assembly of rod–coil BCPs remain sparse.…”

Section: Introductionmentioning

confidence: 99%

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Thin Film Self-Assembly of a Silicon-Containing Rod–Coil Liquid Crystalline Block Copolymer

et al. 2019

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The long-range ordering and directed self-assembly of thin films of a high interaction parameter rod–coil liquid crystalline block copolymer (LC BCP), poly(dimethylsiloxane)-b-poly{2,5-bis[(4-methoxyphenyl)-oxycarbonyl]styrene} (PDMS-b-PMPCS, or DM), is described. The LC BCP was spin-coated on a polystyrene brush functionalized substrate and then thermally annealed at different temperatures with respect to the LC ordering temperature. The effects of the wetting behavior, commensurability between the film thickness and the periodicity, and the LC orientation on the ordering and orientation of the microdomains are described. A monolayer of in-plane cylinders with excellent long-range ordering was produced, and was transferred into SiO x patterns with tunable sub-10 nm feature sizes. Well-ordered multilayer in-plane cylinders were produced in thicker films, and the correlation between microstructure evolution and the LC ordering process was studied by grazing-incidence small-angle X-ray scattering (GISAXS) and wide-angle X-ray scattering (GIWAXS). Finally, the cylindrical rod–coil BCP was directed into a novel ladder morphology within lithographically patterned substrate trenches, as well as into patterns of parallel or transverse cylinders. The ordering of cylinders, the ladder morphology, and the etch selectivity and thermal stability of this high-interaction parameter silicon-containing LC rod–coil BCP demonstrate its applicability to nanoscale lithography.

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