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Synthesis of Mesoporous CuOx Using Inverse Micelle Sol–gel Process for NO2 Gas Sensing
Sung Gue Heo, Sangwoo Kim, Seok-Jun Seo, Jae Jin Sim, Jiyeon Shin, Ali Mirzaei, Myung Sik Choi
Korean J. Met. Mater. 2000;62(8):631-638.   Published online 2024 Jul 31
DOI: https://doi.org/10.3365/KJMM.2024.62.8.631

Abstract
Nitrogen dioxide (NO2) is a highly dangerous gas, mostly emitting emitted from fossil fuels, and a major contributor to air pollution. It has negatively effects affects on the human health as well asand contributes to environmental issues like acid rain. In this study, mesoporous CuOx nanoparticles (NPs) were successfully synthesized..... More

                
Gadolinium-Doped CeO2 Gas Sensor for H2S Sensing
Changhyun Jin, Sangwoo Kim, Dong Eung Kim, Ali Mirzaei, Jong Wook Roh, Sun-Woo Choi, Myung Sik Choi
Korean J. Met. Mater. 2023;61(6):414-421.   Published online 2023 May 18
DOI: https://doi.org/10.3365/KJMM.2023.61.6.414

Abstract
Dihydrogen sulfide (H2S) gas has a flammable nature and is one of the most toxic and dangerous gases. Even small concentrations can be fatal to humans. Herein, we investigated the H2S gas-sensing features of commercial pristine cerium oxide (CeO2 ) and gadolinium (Gd)-doped CeO2 (GDC) nanoparticles. First, the sensing materials..... More

                   Web of Science 2  Crossref 3
Extended Energy Conservation Law in Alloys: the Absence of Energy Non-Equilibrium
Myung Sik Choi, Han Gil Na, Changhyun Jin, Kyu Hyoung Lee
Korean J. Met. Mater. 2020;58(8):566-572.   Published online 2020 Jul 27
DOI: https://doi.org/10.3365/KJMM.2020.58.8.566

Abstract
Assuming that many of the materials produced in a non-equilibrium state remain unchanged, an extended space–energy conservation law was proposed based on the existing energy conservation law. In the present study, by analyzing the well developed equilibrium binary phase diagram of iron (Fe) – carbon (C), we show that energy..... More

                   Web of Science 3  Crossref 3
Low-Temperature H2S Sensors Based on Si-Coated SnO2 Nanowires
Myung Sik Choi, Ali Mirzaei, Jae Hoon Bang, Han Gil Na, Changhyun Jin, Wansik Oum, Seungmin Han, Sang Sub Kim, Hyoun Woo Kim
Korean J. Met. Mater. 2019;57(11):732-740.   Published online 2019 Nov 5
DOI: https://doi.org/10.3365/KJMM.2019.57.11.732

Abstract
To attain high life standards, it is important to develop high-performance non-toxic gas sensors for public safety, environmental pollutant control, industrial processes, etc. Because reports on single element semiconductor-coated semiconducting metal oxides for sensing applications are rare, we synthesized SnO2 nanowires and coated them with a 5 nm-thick or 10..... More

                   Crossref 5
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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