Hyejoo Chung
Ewha Womans University · 工学
研究室紹介
Professor Hyejoo Chung's research lab specializes in the development and characterization of advanced thin films and nanostructured materials for electronic and biomedical applications. The lab focuses on physical vapor deposition techniques—such as magnetron sputtering and ion-beam deposition—to fabricate high-quality ferroelectric, conductive, and functional thin films with controlled crystallographic orientation and microstructure. Research spans materials for microelectronics (e.g., SrBi2Ta2O9), laser mirror coatings (e.g., Cu films), and the structural analysis of rare diseases like chronic neutrophilic leukemia, reflecting a multidisciplinary approach combining materials science, physics, and biomedicine. The lab also contributes to fundamental materials characterization through crystallographic data and ion source development for precision deposition systems.
Research Overview
Research Output Trend
Figures are computed from collected data and may differ slightly.
Selected Papers
15Radio-frequency magnetron sputtering was used to deposit SrBi2Ta2O9 ferroelectric thin films on Pt(111)/Ti/SiO2/Si(001) substrates. Thin films were deposited at room temperature with argon pressures of 0.5–100 mTorr and with sputtering power of 2.5 W/cm2. The crystal orientations of thin films were strongly affected by the argon pressures, the c-axis oriented SrBi2Ta2O9 thin film was obtained with argon pressure of 30 mTorr. The crystal structures of the c-axis oriented SrBi2Ta2O9 thin film were
A combination treatment with topical tacrolimus and an excimer laser may be useful as an induction therapy for up to 6 months, but continuation of this therapy for > 6 months might not provide a better final outcome than monotherapy.
A Kaufman-type 5 cm convex gridded ion-beam source is characterized in terms of angle-resolved ion-beam current density and beam uniformity at various discharge currents, electromagnet currents, and acceleration potentials.
Chronic neutrophilic leukemia(CNL) is a very rare myeloproliferative disease, characterized by sustained mature neutrophilic leukocytosis with granulocytic bone marrow infiltration, high NAP(neutrophilic alkaline phosphatase) score and absence of philadelphia chromosome, It is frequently accompanied by hepatosplenomegaly, elevated serum vitamin B_12 and uric acid level. For the diagnosis of CNL, the leukemoid reaction, especially secondary to neoplasia, infection and autoimmune diseases, should
Partially ionized beam deposition of Cu thin films onto glass at room temperature was carried out to fabricate laser mirrors with good structural and reflective properties. At a constant film thickness of 600 Å, the grain size of as-grown Cu films increased with acceleration voltage. There was no indication of defects such as cracks and/or large pores in the film surface as shown in scanning electron microscopy images. Rms surface roughnesses of 600 Å thick films were measured by atomic force mi
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
International audience
Radio-frequency magnetron sputtering was used to deposit SrBi/sub 2/Ta/sub 2/O/sub 9/ ferroelectric thin films on Pt(111)/Ti/SiO/sub 2//Si(100) substrates with 15% Bi/sub 2/O/sub 3/ excess SrBi/sub 2/Ta/sub 2/O/sub 9/ ceramic target. Thin films were deposited at room temperature with argon pressures of 0.5/spl sim/100 mTorr and sputtering power of 200 W. Deposited thin films were post-annealed at 800/spl deg/C for 2 hours in O/sub 2/ atmosphere. Structural properties were investigated with X-ray