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Octahedral-Shaped Zn<sub>2</sub>SnO<sub>4</sub> and Hexagonal Cylinder-like ZnO Crystals Grown via Thermal Evaporation of Mixtures of ZnS and SnO Powders
ZnS와 SnO 혼합 분말을 열 증발시켜 성장한 팔면체 Zn2SnO4 결정과 육각 원통형 ZnO 결정
Geun-Hyoung Lee이근형
Korean J. Met. Mater. 2024;62(9):721-725. Published online 2024 Sep 5 DOI: https://doi.org/10.3365/KJMM.2024.62.9.721
Abstract
Octahedron-shaped zinc stannate (Zn 2SnO 4) crystals and hexagonal cylinder-like ZnO crystals were synthesized through a simple thermal evaporation method under uncomplicated conditions of air atmosphere. The Zn 2SnO 4 octahedrons were grown by heating a mixture of ZnS and SnO powders, and the ZnO hexagonal cylinder-like crystals were fabricated by heating mixtures of..... More
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Effect of Ga on the Morphology of SnO<sub>2</sub> Nano/Micro-Crystals Grown by a Thermal Evaporation Method
열증발법에 의해 성장한 SnO2 나노/마이크로 결정의 형상에 미치는 Ga의 영향
Geun-Hyoung Lee이근형
Korean J. Met. Mater. 2024;62(7):558-563. Published online 2024 Jun 28 DOI: https://doi.org/10.3365/KJMM.2024.62.7.558
Abstract
SnO 2 nano/micro-crystals with different morphologies were fabricated by the thermal evaporation of SnO 2 powders mixed with Ga 2O 3 powder. The synthesis process was performed at 1300℃ in air. X-ray diffraction (XRD) analysis, energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) were used to examine the..... More
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Effect of Oxygen Concentration on the Growth and Cathodoluminescence Properties of MgO Nanowires
MgO 나노선의 성장과 음극선 발광 특성에 미치는 산소 농도의 영향
Geun-Hyoung Lee이근형
Korean J. Met. Mater. 2023;61(7):509-513. Published online 2023 Jun 21 DOI: https://doi.org/10.3365/KJMM.2023.61.7.509
Abstract
MgO nanowires were grown by a thermal evaporation method at different N 2/O 2 gas ratios in order to investigate the effect of oxygen concentration on the growth and luminescence properties of the MgO nanowires. A thermal evaporation process was conducted at 1000 oC and under a pressure of 500Torr. No nanowires were..... More
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Flexible Transparent Planar Heater Comprising ZnO/Cu/Al<sub>2</sub>O<sub>3</sub>
ZnO/Cu/Al2O3 구조의 유연 투명 면상발열체 연구
Heechang Kim, Dooho Choi김희창, 최두호
Korean J. Met. Mater. 2023;61(7):480-488. Published online 2023 Jun 21 DOI: https://doi.org/10.3365/KJMM.2023.61.7.480
Abstract
In this study, we fabricated transparent heaters composed of an ultrathin Cu-layer heating element sandwiched between a ZnO underlayer and an Al 2O 3 overlayer. With the Cu layer thickness fixed at 8.5 nm, the thicknesses of the ZnO and Al 2O 3 layers were independently varied to reach the optimum antireflecting condition (maximum..... More
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Branched MgO Nanowires Synthesized by Thermal Evaporation Method in Air at Atmospheric Pressure
대기압의 공기 분위기에서 열증발법에 의해 합성된 가지상 구조의 MgO 나노선
Geun-Hyoung Lee이근형
Korean J. Met. Mater. 2023;61(6):444-448. Published online 2023 May 18 DOI: https://doi.org/10.3365/KJMM.2023.61.6.444
Abstract
MgO nanowires with a branched structure were fabricated using a thermal evaporation method in air at atmospheric pressure. The branched MgO nanowire was made up of two parts: a primary central nanowire trunk and lots of secondary nanowire branches. The branched MgO nanowires had a 4-fold symmetrical structure. The secondary..... More
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Ultrathin MgO Nanosheets Fabricated by Thermal Evaporation Method in Air at Atmospheric Pressure
대기압의 공기 분위기에서 열증발법에 의해 제작된 초박형 MgO 나노시트
Geun-Hyoung Lee이근형
Korean J. Met. Mater. 2022;60(10):769-773. Published online 2022 Sep 29 DOI: https://doi.org/10.3365/KJMM.2022.60.10.769
Abstract
Ultrathin MgO nanosheets were successfully synthesized by thermal evaporation of a mixture of Mg and graphite powders as the source material. The synthesis was performed at 1000 oC in air. Scanning electron microscopy showed that the two-dimensional MgO nanosheets had widths of several micrometers and the thickness of less than..... More
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ZnO Nanocrystals with Hexagonal Disk Shape Grown by Thermal Evaporation Method in Air at Atmospheric Pressure
대기압의 공기 분위기에서 열증발법에 의해 성장한 육각형 디스크 형상의 ZnO 나노결정
Geun-Hyoung Lee이근형
Korean J. Met. Mater. 2022;60(8):601-606. Published online 2022 Jul 12 DOI: https://doi.org/10.3365/KJMM.2022.60.8.601
Abstract
Hexagonal-shaped ZnO nanodisks were synthesized at temperatures above 1000oC via thermal evaporation of a mixture of ZnO, SnO, and graphite powders as the source materials. Notably, the ZnO nanodisks were easily formed in ambient air at atmospheric pressure. The ZnO nanodisks could not be obtained without SnO in the source..... More
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Effect of ZnS/C Mass Ratio on the Morphologies and Luminescence Properties of ZnO Nano/Microstructures Synthesized via Thermal Evaporation of ZnS and C Powder Mixtures
ZnS와 C의 혼합 분말을 열증발시켜 생성된 ZnO 나노/마이크로구조의 형상과 발광 특성에 미치는 ZnS/C 질량비의 영향
Geun-Hyoung Lee이근형
Korean J. Met. Mater. 2021;59(4):262-267. Published online 2021 Mar 24 DOI: https://doi.org/10.3365/KJMM.2021.59.4.262
Abstract
ZnO nano/microstructures were grown via a simple thermal evaporation process in air at atmospheric pressure. Mixtures of ZnS and carbon powders were used as the sources. The effects of growth temperature and mass ratio of carbon powder to ZnS on the morphologies and luminescence properties of the ZnO nano/microstructures were..... More
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Nucleation and Growth-Controlled Morphology Evolution of Cu Nanostructures During High-Pressure Thermal Evaporation
Eunji Lee, Woomi Gwon, Sangwoo Ryu
Korean J. Met. Mater. ;59(2):135-141. Published online 2021 Jan 27 DOI: https://doi.org/10.3365/KJMM.2021.59.2.135
Abstract
The formation of porous material structures has been widely investigated for the development of high-performance energy materials, catalysts, and chemical sensing devices. Various nanoporous structure fabrication methods are based on wet-chemical processes, which require precise control of the process parameters. Physical vapor deposition such as thermal evaporation utilizes high vacuum..... More
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Optical Properties of CaF<sub>2</sub> Anti-Reflection Coating On ZnS for 8~12 m Infrared Region
CaF2 저반사 코팅된 ZnS 윈도우의 8~12 µm 적외선 영역 광학적 특성
Ill-Joo Lee, Seung-Chan Hong, Byung-Sam Kim, Jae-Kyung Cheon이일주, 홍승찬, 김병삼, 천재경
Korean J. Met. Mater. 2020;58(6):433-438. Published online 2020 May 19 DOI: https://doi.org/10.3365/KJMM.2020.58.6.433
Abstract
Technologies for pedestrian safety are increasingly emphasized by Automakers in advance of autonomous driving vehicles. A Night Vision System attached behind the front grille can reduce fatal accidents, especially during the nighttime, however, consumers may hesitate to adopt such systems on account of their high price. High-cost Germanium is used..... More
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Catalyst-Free Thermal Evaporation Synthesis of TiO<sub>2</sub> Nanostructures in Atmospheric Air
대기압의 공기 분위기에서 촉매를 사용하지 않는 열증발법을 이용하여 생성된 TiO2 나노구조
Geun-Hyoung Lee이근형
Korean J. Met. Mater. 2020;58(5):353-356. Published online 2020 Apr 14 DOI: https://doi.org/10.3365/KJMM.2020.58.5.353
Abstract
TiO 2 nanostructures were synthesized using a thermal evaporation method without a catalyst. TiO powders mixed with graphite powders were used as the source materials. The synthesis process was performed in air atmosphere at 1000 °C. When the mass ratio of TiO/graphite in the source material was 2:1, TiO 2 nanowires and..... More
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Evolution of Hole Transport/Perovskite Layer Properties with Au Evaporation Condition in a Perovskite Solar Cell
페로브스카이트 태양전지의 Au 열증착 조건에 따른 Hole Transport/Perovskite 층의 물성변화
Kwangbae Kim, Taeyeul Park, Ohsung Song김광배, 박태열, 송오성
Korean J. Met. Mater. 2018;56(4):321-326. Published online 2018 Apr 5 DOI: https://doi.org/10.3365/KJMM.2018.56.4.321
Abstract
Changes in the properties of the hole transport layer (HTL) and the perovskite layer in a perovskite solar sell (PSC) were observed under various Au thermal evaporation conditions. We employed a conventional thermal evaporator with a distance of 30 cm between the source and substrate in a vacuum of 6..... More
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