Byung Hyuk Son

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

Tunable memory characteristics are investigated according to the metal-nanoparticle species being used in memory devices. The memory devices are fabricated using diblock copolymer micelles as templates to synthesize nanoparticles of cobalt, gold, and a binary mixture thereof. Programmable memory characteristics show different charging/discharging behaviors according to the storage element configurations as confirmed by nanoscale device characterization.

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

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHighly Ordered Arrays of Nanoparticles in Large Areas from Diblock Copolymer Micelles in Hexagonal Self-AssemblySang-Hyun Yun, Seong Il Yoo, Jin Chul Jung, Wang-Cheol Zin, and Byeong-Hyeok SohnView Author Information Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea, and Department of Chemistry, NANO Systems Institute, Seoul National University, Seoul 151-747, Korea Cite this: Chem

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

Recently, it has been noticed that surface plasmon resonance of metal nanoparticles can alter the intrinsic properties of nearby fluorophores. Field enhancement and radiative decay engineering are major principles for understanding a number of experimental observations such as enhanced and quenched emission of fluorophores in the vicinity of metal nanoparticles. At the same time, there are apparent similarities between surface-plasmon-coupled fluorescence and fluorescence resonance energy transf

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.

Despite a rich choice of two-dimensional materials, which exists these days, heterostructures, both vertical (van der Waals) and in-plane, offer an unprecedented control over the properties and functionalities of the resulted structures. Thus, planar heterostructures allow p-n junctions between different two-dimensional semiconductors and graphene nanoribbons with well-defined edges; and vertical heterostructures resulted in the observation of superconductivity in purely carbon-based systems and

Hexagonal arrangement of iron oxide nanoparticles was fabricated by utilizing a single-layered film of diblock copolymer micelles. The synthesis was directly performed on the solid substrate by oxygen plasma with preserving the dimensional order of micelles so that separate procedures for synthesis and deposition of nanoparticles were not necessary. Since the oxygen plasma treatment also eliminated polymers, pure patterns of iron oxide nanoparticles were obtained. Moreover, easy control over the

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