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Control of Self-Assembly and Elemental Mixing of AuNi Bimetallic Nanoparticles via Solid-State and Liquid-State Dewetting of Metal Thin Films
금속박막의 고상 및 액상 비젖음 공정을 통한 AuNi 이종금속 나노입자의 자기 정렬 및 성분 혼합 제어
Yoon Hwan Moon, Jong Geun Park, Yong Jun Oh
문윤환, 박종근, 오용준
Korean J. Met. Mater. 2024;62(1):51-56.   Published online 2023 Dec 29
DOI: https://doi.org/10.3365/KJMM.2024.62.1.51

Abstract
Immiscible Au-Ni alloy thin films undergo phase separation and dewetting because of thermodynamic and morphological instability at elevated temperatures below the miscibility gap. We report the formation and assembly of bimetallic nanoparticles (BNPs) on topographic Si templates. An ordered array of inverted pyramidal pits were produced via solid-state and liquid-state..... More

                
Fabrication of Ruthenium-Based Transition Metal Nanoparticles/Reduced Graphene Oxide Hybrid Electrocatalysts for Alkaline Water Splitting
루테늄 기반 전이금속 나노입자/환원된 산화그래핀 혼성체를 이용한 알칼리 수전해 촉매 합성
Eun Been Lee, Seung Geun Jo, Sang Jun Kim, Gil-Ryeong Park, Jung Woo Lee
이은빈, 조승근, 김상준, 박길령, 이정우
Korean J. Met. Mater. 2023;61(3):190-197.   Published online 2023 Feb 24
DOI: https://doi.org/10.3365/KJMM.2023.61.3.190

Abstract
Green hydrogen has attracted significant attention as one of the future energy sources because no greenhouse gases are emitted during production and its energy density is much higher than fossil fuels. Precious metals such as platinum (Pt) and iridium (Ir)-based catalysts are commonly used for water splitting catalysts. However, because..... More

                   Web of Science 2  Crossref 3
Fabrication of Self-Healable, Robust, and Superhydrophobic Nanocomposite Films
Siwoo Park, Young-Geun Ha
Korean J. Met. Mater. 2023;61(1):54-59.   Published online 2022 Dec 28
DOI: https://doi.org/10.3365/KJMM.2023.61.1.54

Abstract
Despite the recent advances in nature-inspired superhydrophobic surfaces with multifunctional properties such as self-healing, self-cleaning, antibacterial material, anti-biofouling, and oil-water separation in various industrial applications, there have been very few reports of robust superhydrophobic surfaces fabricated via a low-cost method. Herein, we report a rationally designed, self-healable, robust, and superhydrophobic..... More

                   Web of Science 1  Crossref 1
Porous MnO<sub>2</sub>/ carbon Hybrid Material with Improved Electrochemical Performance
Venugopal Nulu
Korean J. Met. Mater. 2021;59(9):670-676.   Published online 2021 Aug 4
DOI: https://doi.org/10.3365/KJMM.2021.59.9.670

Abstract
In this work, MnO2 nanoparticles were embedded in a carbon matrix as a porous composite, fabricated using a simple chemical route followed by low-temperature annealing, with activated carbon (AC) as the carbon source in the composite preparation. The porous MnO2/carbon structures contained some selective nanoparticles coated with carbon. The structural..... More

                
A Study on the Stability of TiO<sub>2</sub> Nanoparticles as an Electron Transport Layer in Quantum Dot Light-Emitting Diodes
TiO2 나노입자를 전자 수송층으로 사용한 양자점 발광다이오드의 용액 안정성 연구
Moonbon Kim, Jiwan Kim
김문본, 김지완
Korean J. Met. Mater. 2021;59(7):476-480.   Published online 2021 Jun 16
DOI: https://doi.org/10.3365/KJMM.2021.59.7.476

Abstract
We report highly efficient and robust quantum dot light-emitting diodes (QLEDs) with Li-doped TiO2 nanoparticles (NPs) as an electron transport layer (ETL). As core materials, ZnO-based inorganic NPs can enhance the performance of QLEDs due to their suitable energy level and solution processability. However, their fast electron mobility and instability..... More

                   Web of Science 2  Crossref 2
Causes and Measures of Fume in Directed Energy Deposition: A Review
Directed Energy Deposition에서 흄의 생성 원인 및 대책
Kang-Hyung Kim, Chan-Hyun Jung, Dae-Yong Jeong, Soong-Keun Hyun
김강형, 정찬현, 정대용, 현승균
Korean J. Met. Mater. 2020;58(6):383-396.   Published online 2020 May 14
DOI: https://doi.org/10.3365/KJMM.2020.58.6.383

Abstract
Pores and cracks are known as the main defects in metal additive manufacturing (MAM), including directed energy deposition(DED). A gaseous fume is often produced by laser flash (instantaneous high temperature) during laser processing, which may cause various defects such as porosity, lack of fusion, inhomogeneity, low flowability and composition change,..... More

                   Web of Science 2  Crossref 2
A Method of Synthesizing Lithium Hydroxide Nanoparticles Using Lithium Sulfate from Spent Batteries by 2-Step Precipitation Method
Soyeong Joo, Hyun-Woo Shim, Jin-Ju Choi, Chan-Gi Lee, Dae-Guen Kim
Korean J. Met. Mater. 2020;58(4):286-291.   Published online 2020 Mar 10
DOI: https://doi.org/10.3365/KJMM.2020.58.4.286

Abstract
In this work, LiOH was synthesized using highly soluble Li2SO4. To enhance efficiency, this synthesis was performed using the precipitation method, and the correlation between each experimental condition and the synthesis of LiOH was investigated. The particle size and crystalline properties were tailored by controlling various experimental conditions, including the..... More

                   Web of Science 5  Crossref 6
Photocatalytic Characterization of TiO<sub>2</sub> Nanotubes with Pd Particles Synthesized by Photoreduction Process
광환원반응을 통한 TiO2/Pd 복합광촉매 제조와 광촉매 특성
Jong-Ho Lee, Hong-Joo Ahn, Jeong-Il Youn, Young-Jig Kim, Su-Jeong Suh, Han-Jun Oh
이종호, 안홍주, 윤정일, 김영직, 서수정, 오한준
Korean J. Met. Mater. 2019;57(8):510-520.   Published online 2019 Jul 8
DOI: https://doi.org/10.3365/KJMM.2019.57.8.510

Abstract
To decompose dye in aqueous solution, Pd nanoparticle-decorated TiO2 nanotube photocatalysts were fabricated through electrochemical anodization and photoreduction processes. Morphological and surface characterization of the TiO2/Pd heterojunction photocatalyst, as well as photoelectrochemical behaviors, were investigated by X-ray diffraction, UV/Vis diffuse reflectance and photocurrent response. It was found that the precipitated..... More

                   Web of Science 5  Crossref 3
Role of Voltage and Gas Pressure in Determining the Mean Diameter of Sn-Bi-Ag Intermetallic Compound Nanoparticles Formed by Pulsed Wire Discharge
Dae Geol Jeong, Jae Min Cha, Dae Sung Kim, Ju Hyeong Kim, Hwa Jin Jeong, Jae Young Shin, Jun Hyeon Bae, Bong Ki Ryu, Hisayuki Suematsu, Kenta Tanaka
Korean J. Met. Mater. 2017;55(11):806-812.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.806

Abstract
Nanoscale Sn-Bi-Ag compound powders were successfully synthesized using the pulsed wire discharge (PWD) method. In PWD, when a high current is passed through high-density metal wires, the wires explode because of resistance heating, forming fine particles or metal vapor. In this study, we used Sn-Bi and Ag wires in order..... More

    
Electrical and Optical Investigation of the Growth Behavior of Au Nanoparticles Fabricated on Various Matrix Materials by the Alternating Sputtering Method
교번스퍼터링법에 의해 다양한 기지상 재료위에 형성된 Au 나노입자의 성장거동에 대한 전기, 광학적 분석
Bum-Joon Kim, Hyun Chul Kim, Jong-Geon Park, Kyeong-Seok Lee
김범준, 김현철, 박종건, 이경석
Korean J. Met. Mater. 2017;55(10):739-744.   Published online 2017 Sep 28
DOI: https://doi.org/10.3365/KJMM.2017.55.10.739

Abstract
Nanocomposite films, which are comprised of metal nanoparticles dispersed in a matrix layer, have attracted great interest due to their unique electrical and optical properties, which are mainly due to the excitation of localized surface plasmons. In this study, we employed an alternating sputtering method to fabricate such nanocomposite films...... More

    
Effect of E-Beams Irradiation Dose on the Sensing Properties of Pt-Functionalized Reduced Graphene Oxides Following Annealing of the 6 nm-Thick Pt Layer
Yong Jung Kwon, Ali Mirzaei, Han Gil Na, Sung Yong Kang, Myung Sik Choi, Jae Hoon Bang, Jaegab Lee, Inpil Kang, Sang Sub Kim, Hyoun Woo Kim
Korean J. Met. Mater. 2017;55(7):492-502.   Published online 2017 Jul 4
DOI: https://doi.org/10.3365/KJMM.2017.55.7.492

Abstract
Pt-functionalized RGO samples were prepared and subsequently irradiated with 2-MeV electron beams (e-beams). The effect of e-beam dose on the structural, electrical, and gas sensing properties of the samples was investigated. E-beam irradiation was found to induce significant microstructural changes in the Pt-functionalized RGO. Measurements of NO2 sensing at room..... More

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