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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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Ordering evolution of block copolymer thin films upon solvent-annealing process

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Title
Ordering evolution of block copolymer thin films upon solvent-annealing process
Author
Lee, Dong HyunCho, HeesookYoo, SeungminPark, Soojin
Keywords
2-vinylpyridine; Annealing time; Block copolymer thin films; Bulk phase; Disordered state; Micellar structures; Nano-objects; Ordering process; Poly(2-vinylpyridine) (P2VP); Selective solvents; Si substrates; Solvent annealing; Transmission electron microscopy tem
Issue Date
201210
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Citation
JOURNAL OF COLLOID AND INTERFACE SCIENCE, v.383, no.1, pp.118 - 123
Abstract
Morphologies of polystyrene-block-poly(2-vinylpyridine) copolymer (S2VP) thin films, which are forming poly(2-vinylpyridine) cylinders in bulk phase, were investigated by atomic force microscopy (AFM) and transmission electron microscopy (TEM) to account for their ordering behavior induced by solvent annealing. Initially, when the copolymer was dissolved in toluene, which is selective solvent for majority polystyrene (PS) blocks, and was spin-coated on Si substrates, dimple-type micellar structures of S2VP were formed. After the film was placed in a solvent-annealing chamber covered with a lid under the existence of chloroform, surface morphologies of S2VP were measured as a function of annealing time. In this study, it was found that the morphologies of S2VP thin film repeated the cycle of the creation and extinction of various morphologies on ordering process. Namely, S2VP exhibited the various transformations between different morphologies, including highly disordered state, cylinders normal to the plane, and cylinders parallel to the plane. Each of the morphologies observed here was employed as a template to synthesize gold (Au) nanoparticles or nanowires. The arrays of Au nano-objects were used to tune a surface plasmon resonance.
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DOI
http://dx.doi.org/10.1016/j.jcis.2012.06.030
ISSN
0021-9797
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