Seoul National University · Materials Science
Professor Byeong-Hyeok Sohn's research lab specializes in the design and fabrication of advanced nanostructured materials using block copolymer self-assembly as a versatile platform. The lab focuses on creating precisely ordered hybrid nanostructures by integrating nanoparticles (such as gold and iron oxide) with polymers, enabling control over nanoparticle positioning, density, and functionality. Key research directions include the development of multilayered and mosaic nanopatterned films, transferable 2D nanomaterials (e.g., rGO-Au hybrids), and nanoarchitectured energy devices such as perovskite solar cells with tailored oxide scaffolds. The lab emphasizes both fundamental understanding of self-assembly mechanisms and practical applications in energy conversion and electrochemical sensing.
Figures are computed from collected data and may differ slightly.
We demonstrated a self-assembly of two different kinds of nanoparticles simultaneously directed on a monolayer film of diblock copolymer micelles via physical and chemical arrangements. We first incorporated gold nanoparticles physically around the micelles of a monolayer film of PS-PVP micelles having a short-range hexagonal order. Iron oxide nanoparticles were then synthesized chemically in the PVP core area of the ordered micelles, resulting in a mosaic nanopattern of magnetic iron oxide nano
We demonstrated successful fabrication of a multilayered nanostructure of alternating pure polymeric lamellae and gold nanoparticle-containing lamellae, both in a nanometer thickness, by utilization of thin films of symmetric polystyrene-block-poly(4-vinylpyridine), PS-b-P4VP. The strong interaction between the P4VP block and the substrate and lower surface energy of the PS block generated a multilayer of lamellae parallel to the substrate with an asymmetric wetting configuration. Then, gold nan
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNanopatterns by Free-Standing Monolayer Films of Diblock Copolymer Micelles with in Situ Core−Corona InversionByeong-Hyeok Sohn, Seong-Il Yoo, Byung-Wook Seo, Sang-Hyun Yun, and Sang-Min ParkView Author Information Department of Materials Science and Engineering Polymer Research Institute, Pohang University of Science and Technology Pohang 790-784, Korea Cite this: J. Am. Chem. Soc. 2001, 123, 50, 12734–12735Publication Date (Web):November 20, 20
Reduced graphene oxide (rGO) films are decorated with non‐overlapping Au nanoparticles using diblock copolymer micelles that provide controllability over the number density as well as the diameter of the nanoparticles. This synthetic process produces a pure Au surface without extra layers. Furthermore, the rGO film enables the transferability of the Au nanoparticles without deterioration of their arrays. Thus, the controllability of the Au nanoparticles and their transferability with rGO films
Directional attraction with lateral repulsion between colloidal nanoparticles can create their supracolloidal chains. Here, we demonstrate supracolloidal polymers of diblock copolymer micelles, which were polymerized by adjusting the polarity of the solvent. We also synthesized supracolloidal random and block copolymer chains.
We fabricated perovskite solar cells with enhanced device efficiency based on vertically oriented TiO2 nanostructures using a nanoporous template of block copolymers (BCPs). The dimension and shape controllability of the nanopores of the BCP template allowed for the construction of one-dimensional (1-D) TiO2 nanorods and two-dimensional (2-D) TiO2 nanowalls. The TiO2 nanorod-based perovskite solar cells showed a more efficient charge separation and a lower charge recombination, leading to better
Recent advances in the process of using single layers of diblock copolymer micelles for the fabrication of arrays of nanoparticles were highlighted. The technique using a monolayer of diblock copolymer micelles as an effective nanostructured template allowed precise control over the type, size, location, and ordering regularity of nanoparticles. The approach using copolymer micelles was fully compatible with top-down lithographical methods for micropatterning of nanoparticles. In addition, an ar
Controlled light emission is generated from thin films of fluorophores that are encapsulated in diblock copolymer micelles. The mutual distance between the two fluorophores is regulated by utilization of the nanometer-sized micellar structure, which enables or restricts energy transfer between the fluorophores. This encapsulation method results in single or simultaneous light emission (see figure).
Thin films consisting of polyelectrolytes and positively charged TiO2 nanoparticles were fabricated by the dip and the spin self-assembly (SA) methods. Employing the same deposition sequence in both methods, both SA films showed a similar thickness. We observed a comparatively layered structure in the spin SA film and a fuzzy structure in the dip SA film. As the number of TiO2 nanoparticle layers was increased, the photooxidized amount of iodide and methyl orange increased in the dip SA film but
A hexagonal array of optically active ZnO nanoparticles was synthesized in situ on the solid substrate by utilizing a single-layered film of diblock copolymer micelles as a nanostructured template.
We report controlled branching and eventual crosslinking in supracolloidal chains by introducing well-defined trifunctional patchy micelles. Uniform micelles having three patches were induced from core-crosslinked micelles of diblock copolymers. Three patches in the micelles served as functional groups for crosslinking as well as branching in supracolloidal polymerization.
We demonstrate the fabrication of fluorescent supracolloidal chains functionalized with quantum dots, which were polymerized from patched micelles of diblock copolymers by adjusting the polarity of the solvent. Supracolloidal random and block chains with green- and red-emitting quantum dots were also synthesized.
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