Size-Controlled Nanoparticle-Guided Assembly of Block Copolymers for Convex Lens-Shaped Particles

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The tuning of interfacial properties at selective and desired locations on the particles is of great importance to create the novel structured particles by breaking the symmetry of their surface property. Herein, a dramatic transition of both the external shape and internal morphology of the particles of polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) was induced by precise positioning of size-controlled Au nanopartide surfactants (Au NPs). The size-dependent assembly of the Au NPs was localized preferentially at the interface between the P4VP domain at the particle surface and the surrounding water, which generated a balanced interfacial interaction between two different PS/P4VP domains of the BCP particles and water, producing unique convex lens-shaped BCP particles. In addition, the neutralized interfacial interaction, in combination with the directionality of the solvent-induced ordering of the BCP domains from the interface of the particle/water, generated defect-free, vertically ordered porous channels within the particles. The mechanism for the formation of these novel nanostructures was investigated systemically by varying the size and the volume fraction of the Au NPs. Furthermore, these convex lens-shaped particles with highly ordered channels can be used as a microlens, in which the light can be concentrated toward the focal point with enhanced near-field signals. And, these particles can possess additional optical properties such as unique distribution of light scattering as a result of the well-ordered Au cylinders that filled into the channels, which hold great promise for use in optical, biological-sensing, and imaging applications.
Publisher
AMER CHEMICAL SOC
Issue Date
2014-07
Language
English
Article Type
Article
Keywords

THIN-FILMS; GOLD NANOPARTICLES; DIBLOCK COPOLYMERS; TRIBLOCK COPOLYMERS; COLLOIDAL PARTICLES; POLYMER BLENDS; QUANTUM DOTS; SIMPLE ROUTE; NANOCOMPOSITES; LOCATION

Citation

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.136, no.28, pp.9982 - 9989

ISSN
0002-7863
DOI
10.1021/ja502075f
URI
http://hdl.handle.net/10203/190063
Appears in Collection
PH-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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