Seung Yong Bae

Korea Institute of Science and Technology

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Jeunghee Park

Korea University

Hee Won Seo

Korea Institute of Machinery and Materials

Hyun-Ik Yang

Hanyang University

Chan Woong Na

Korea Institute of Industrial Technology

Sangsig Kim

Korea University

Hyun Chul Choi

Chonnam National University

Bongsoo Kim

AM Technology (United Kingdom)

H. Kumazawa

University of Toyama

Jeunghee Park

Korea University

Han Sung Kim

Yonsei University

Cooperative Institutions

Korea University

Government of the Republic of Korea

Seoul National University

Korea Institute of Science and Technology

Pohang University of Science and Technology

Hanyang University

Korea Advanced Institute of Science and Technology

Yonsei University

Samsung (South Korea)

Sungkyunkwan University

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Synthesis and Magnetic Properties of Manganese‐Doped GaP Nanowires.

ChemInform (2005)

Doo Suk Han Seung Yong Bae Hee Won Seo Young Joo Kang Jeunghee Park

Abstract For Abstract see ChemInform Abstract in Full Text.

10.1002/chin.200534014

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Citations (0)

Progressive Multi-View Instance Matching: Occlusion-Robust Approach with Initial Segmentation Enhancement

IEEE Sensors Journal (2024)

Seung Yong Bae Su-Hyeong Jang Juhyun Lee Hyunsuk Ko

Robustness

10.1109/jsen.2024.3515115

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Heterostructures of ZnO Nanorods with Various One-Dimensional Nanostructures

The Journal of Physical Chemistry B (2004)

Seung Yong Bae Hee Won Seo Hyun Chul Choi Jeunghee Park Jucheol Park

High-density ZnO nanorods can be grown on pregrown one-dimensional nanostructures via thermal chemical vapor deposition of Zn at a low temperature of 500 °C, producing various heterostructures. We demonstrate it using carbon nanotubes, GaN nanowires, GaP nanowires, SiC nanowires, and SiC core−C shell coaxial nanocables. The diameter of ZnO nanorods is in the range of 80−150 nm, and the maximum length is about 3 μm. The ZnO nanorods align vertically on the walls of 1D nanostructures, with a uniform growth direction of [001]. We suggest a vapor−liquid−solid growth mechanism that Zn vapor deposits on the 1D nanostructures and produces the outer layers encapsulating the 1D nanostructures; the ZnO nanorods are grown out from the outer layers of the nanocable structure. The length and density of ZnO nanorods are controllable by the deposition time. All of these heterostructures exhibit intense UV photoluminescence and cathodoluminescence. The green emission intensity is correlated with the density of the ZnO nanorods.

Nanorod

Cathodoluminescence

Coaxial

10.1021/jp048918q

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Citations (130)

Magnetic properties of sol-gel derived Ni-Zn ferrite thin films

Journal de Physique IV (Proceedings) (1998)

Seung Yong Bae H.-J. Jung C. S. Kim Young‐Jei Oh

10.1051/jp4:1998262

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Citations (8)

Controlled Structure of Gallium Oxide and Indium Oxide Nanowires

MRS Proceedings (2003)

Hye Jin Chun Seung Yong Bae Jeunghee Park

Vapor–liquid–solid method

Monoclinic crystal system

10.1557/proc-789-n11.27

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Citations (2)

Direct Synthesis of Gallium Nitride Nanowires Coated with Boron Carbonitride Layers

The Journal of Physical Chemistry B (2003)

Hee Won Seo Seung Yong Bae Jeunghee Park Hyun-Ik Yang Bongsoo Kim

Gallium nitride nanowires coated with boron carbonitride layers were directly synthesized by thermal chemical deposition using the reaction of gallium, gallium oxide, boron oxide, and carbon nanotubes under an ammonia atmosphere. The average diameter is 30 nm, and the length is up to 1 mm. Less than 20 graphitic sheets coat the single-crystalline wurtzite-structured gallium nitride nanowires. The graphitic outerlayers are composed of boron, carbon, and nitrogen atoms with a ratio of about 1:2:1. The photoluminescence exhibits a broad band in the energy range 2.1−3.6 eV, suggesting a contribution of the emission from the graphitic boron carbonitride outerlayers.

Wurtzite crystal structure

Boron oxide

Carbon fibers

10.1021/jp0340055

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Citations (13)

Control of Morphology and Growth Direction of Gallium Nitride Nanostructures

MRS Proceedings (2003)

Seung Yong Bae Hee Won Seo Jeunghee Park

Vapor–liquid–solid method

Atmospheric temperature range

10.1557/proc-789-n11.30

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Sorption and permeation behavior for CO₂ in NH₃‐plasma‐treated and untreated polystyrene membranes

Journal of Applied Polymer Science (2006)

Ya‐Wun Yang Hyun Jung Kwak Seung Yong Bae H. Kumazawa

Abstract In our preceding work, the simultaneous deviation from the conventional dual‐mode sorption and mobility model was observed in a case of CO 2 in polystyrene (PS) membrane (glass transition temperature of pure polymer = 95°C) at 60 and 70°C. The plasticization effect of sorbed CO 2 on both the sorption and diffusion processes tends to be brought about in glassy polymer membranes near the glass transition temperature. The behavior was simulated based on the concept that only one population of sorbed gas molecules of plasticizing ability to the polymer should exist. In the present work, the sorption and permeation behavior for CO 2 in NH 3 ‐plasma‐treated and untreated PS membranes at 40°C was investigated, where NH 3 ‐plasma treatment was executed at plasma discharge powers of 40, 80, 120, and 160 W for an exposure time of 2 min. The sorption isotherm could be described by the sorption theory of Mi et al. (Macromolecules 1991, 24, 2361), where the glass transition temperature is depressed by a concentration of sorbed CO 2 of plasticizing ability. NH 3 ‐plasma treatment on PS membrane had little influence on the sorption behavior of CO 2 at plasma discharge powers up to 160 W. The mean permeability coefficients were somewhat increased only at a discharge power of 160 W. At CO 2 pressures below 0.9 MPa, the pressure dependencies of mean permeability coefficients for CO 2 in both NH 3 ‐plasma‐treated and untreated PS membranes at 40°C could also be simulated on the basis of the concept that only one population of sorbed gas molecules of plasticizing ability should exist. At CO 2 pressures above 0.9 MPa, however, a plasticization action of sorbed CO 2 had much more influence on the diffusion process rather than on the sorption one, and such a combined concept underestimated the mean permeability coefficient. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 1798–1805, 2007

Polystyrene

Plasticizer

10.1002/app.25236

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Citations (5)

Depolymerization of polyethyleneterephthalate in supercritical methanol

Journal of Applied Polymer Science (2001)

B.‐K. Kim Gyou-Cheol Hwang Seung Yong Bae Sung Yi H. Kumazawa

Abstract The depolymerization of polyethyleneterephthalate (PET) in supercritical methanol was carried out using a batch‐type autoclave reactor. The total conversion and the yield of dimethylterephthalate (DMT) increased with rising temperature. The final yield of DMT at 300°C and 310°C reached 97.0% and 97.7%, respectively. The yield of DMT was markedly increased when the methanol density was 0.08 g/cm 3 , and leveled off at higher densities. A kinetic model to describe the depolymerization of PET in supercritical methanol was proposed, where the scission of one ester linkage in PET by a methanol molecule produces one carboxymethyl group and one hydroxyl group. The values of the forward reaction rate constant at different temperatures were determined by comparing the observed time dependence of carboxymethyl group concentration with that calculated by the proposed model. The activation energy was evaluated to be 49.9 kJ/mol, a value close to a literature value (55.7 kJ/mol). © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 2102–2108, 2001

Depolymerization

Autoclave

10.1002/app.1645

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Citations (78)

Thorn-like BN nanostructures

Solid State Communications (2004)

Woo Sung Jang Seung Yong Bae Jeunghee Park Jae‐Pyoung Ahn

Deposition

10.1016/j.ssc.2004.10.025

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Citations (8)