Core–Shell and Zigzag Nanostructures from a
Thin Film Silicon-Containing Conformationally Asymmetric Triblock
Terpolymer
Posted on 2019-06-24 - 20:45
The
self-assembly of multiblock copolymers generates diverse hierarchical
nanostructures and greatly extends the range of microdomain geometries
beyond those produced by diblock copolymers. We report the synthesis
of a conformationally asymmetric ABC triblock terpolymer in which
the end blocks are a mesogen-jacketed liquid crystalline polymer and
poly(dimethylsiloxane), respectively, and its self-assembly under
mixed solvent vapor annealing forms a range of sphere, cylinder, and
perforated lamellar core–shell morphologies, as well as stacked
multilevel structures. Sub-7 nm diameter SiOx nanopatterns were generated by selective plasma etching of
the small volume fraction Si-containing core block giving a line/space
ratio of ∼1:4. Moreover, the conformational asymmetry of this
terpolymer leads to zigzag cylinders on a flat substrate and stable
cylinder alignment transverse to template sidewalls within lithographically
patterned trenches.
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Shi, Ling-Ying; Liao, Fen; Cheng, Li-Chen; Lee, Sangho; Ran, Rong; Shen, Zhihao; et al. (2019). Core–Shell and Zigzag Nanostructures from a
Thin Film Silicon-Containing Conformationally Asymmetric Triblock
Terpolymer. ACS Publications. Collection. https://doi.org/10.1021/acsmacrolett.9b00283