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Byeon, Jeong Hoon,Lee, Ryang Hwa,Hwang, Jungho Institute of Physics [etc.] 2009 Journal of physics. D, applied physics Vol.42 No.5
<P>This paper introduces a novel method for fabricating copper (Cu) oxide/activated carbon fibre (ACF) through the aerosol palladium (Pd) activation for use in electroless Cu deposition and heat treatment of Cu deposited ACF with nitric monoxide (NO) gas injection. Electroless Cu deposition was initiated by catalytically activating the ACF surface with spark generated Pd aerosol nanoparticles. The catalytically activated ACF was placed into a solution used for the electroless Cu deposition. Subjecting the Cu deposited ACF to a heat treatment in a NO/nitrogen (N<SUB>2</SUB>) gas injection (1000 ppm NO) resulted in changes to the morphology of the Cu particles. As the temperature increased from 100 to 500 °C, the relative mass fraction of oxygen in the Cu particles increased from 3.6% to 14.2% and the fraction of Cu decreased from 41.2% to 34.1%, which was caused by the formation of Cu oxides (Cu<SUB>2</SUB>O and CuO). The corresponding surface area and pore volume of the ACF decreased from 1019 m<SUP>2</SUP> g<SUP>−1</SUP> to 401 m<SUP>2</SUP> g<SUP>−1</SUP> and from 0.40 cm<SUP>3</SUP> g<SUP>−1</SUP> to 0.18 cm<SUP>3</SUP> g<SUP>−1</SUP>, respectively. The morphological evolution and decrease in porosity were attributed to volume expansion of Cu particles during oxidation.</P>
Byeon, Jeong Hoon,Park, Dongho,Kim, Jeong Yeol RSC Pub 2015 Nanoscale Vol.7 No.6
<P>Site-selective deposition of aerosol Pd nanoparticles on a substrate was employed to fabricate nanoscale Ag dots and rings through a subsequent electroless deposition. The fabricated nanoscale dot and ring arrays respectively showed properties in surface-enhanced Raman (SER, with a 1.8 10(5) enhancement factor) and Fourier transform near infrared (FT-NIR, at 6153 cm(-1) absorption band) spectra.</P>
유전체 배리어 방전형 2단 전기집진기의 인가전압 파형별 미세입자 집진특성
변정훈(Jeong?Hoon Byeon),박재홍(Jae?Hong Park),윤기영(Ki?Young Yoon),황정호(Jungho Hwang) 한국실내환경학회 2005 한국실내환경학회지 Vol.1 No.2
Dielectric barrier discharge (DBD) in air, which has been established for the production of large quantities of ozone, is more recently being applied to a wider range of aftertreatment processes for HAPs (hazardous air pollutants). Although DBD has high electron density and energy, its potential use as precharging nano and submicron sized particles, is not known. In this work, we measured VI (voltagecurrent) characteristics of DBD and estimated the collection efficiency of particles with bimodal distribution by DBD type 2stage ESP (electrostatic precipitator). To examine the particle collection with various applied voltage waveforms of DBD, nano size particles of NaCl (20∼100 ㎚) and DOS (50∼800 ㎚) were generated by an electrical tube furnace and an atomizer, respectively. Particle collection efficiencies of all the cases increased with increase of DBD electric power that the results corresponded to product of V by I whose magnitudes were the largest in triangular voltage waveform.
배리어 유전체 방전형 2단 전기집진기의 나노입자 집진 및 잔류 오존 제거 특성
변정훈(Jeong-Hoon Byeon),지준호(Jun-Ho Ji),윤기영(Ki-Young Yoon),황정호(Jungho Hwang) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
DBD(Dielectric Barrier Discharge) plasma in air is well established for the production of large quantities<br/> of ozone and is more recently being applied to aftertreatment processes for HAPs(Hazardous Air Pollutants).<br/> Although DBD high electron density and energy, its potential use as nano and sub-micron sized particle<br/> charging are not well known. Aim of this work is to determine design and operating parameters of a two-stage<br/> ESP with DBD. DBD and ESP are used as particle charger and precipitator, respectively. We measured<br/> particle precipitation efficiency of two-stage ESP and estimated ozone decomposition of both pelletized MnO2<br/> catalyst and pelletized activated carbon. To examine the particle precipitation efficiency, nano and sub-micron<br/> sized particles were generated by a tube furnace and an atomizer. AC voltage of 7~10 kV(rms) and 60 Hz is<br/> used as DBD plasma source. DC -8 kV is applied to the ESP for particle precipitation. The overall particle<br/> collection efficiency for the two-stage ESP with DBD is over 85 % under 0.64 m/s face velocity. Ozone<br/> decomposition efficiency with pelletized MnO2 catalyst or pelletized activated carbon packed bed is over<br/> 90 % when the face velocity is under 0.4 m/s in dry air.
구리가 코팅된 활성섬유탄소의 항균 및 VOC 흡/탈착 특성
변정훈(Jeong Hoon Byeon),윤기영(Ki Young Yoon),박재홍(Jae Hong Park),고병주(Byung Ju Ko),윤희승(Hee Seung Yoon),황정호(Jungho Hwang),유승곤(Seung Kon Ryu) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The aim of this study is to assess the applicability of simultaneous control of a microbial colonization and a volatile organic compounds (VOC) penetration using a copper plated activated carbon fiber (ACF). Antimicrobial material, generated by using an electroless copper-plating, applied to the ACF filter media and tested for their ability to reduce microbial colonization and VOC penetration. This study contribute to the filtration complexity problems concerning the removal of microbial contamination and VOC penetration of air filters in the heating, ventilating, air-conditioning and air cleaning systems commonly used in indoor environments, hospitals, electronic industry, pharmaceutical industry and other environments where the absence of contaminating microorganisms and VOC is required.
Se-doped Ge10Sb90 for highly reliable phase-change memory with low operation power
Kim, Jeong Hoon,Byeon, Dae-Seop,Ko, Dae-Hong,Park, Jeong Hee Cambridge University Press (Materials Research Soc 2017 Journal of materials research Vol.32 No.13
<▼1><B>Abstract</B><P/></▼1><▼2><P>In this study, we propose a Se-incorporated Ge10Sb90 as a phase-change material for phase-change memory (PCM) with high reliability and low operation power. We investigated the effect of the Se concentration on the thermal and electrical properties of Se-doped Ge10Sb90 films by varying the Se concentration from 0 to 20 at.%. The crystallization temperature, crystallization activation energy, and maximum ten-year data retention temperature increased with the increasing Se, thus demonstrating the improved thermal stability of Se-doped Ge10Sb90 films with higher Se contents. More Se also increased the rate factor, band gap, threshold voltage, and load resistance. In addition, the crystallization speed, programming window, and resistances of both the amorphous and crystalline states increased with the increasing Se concentration. In contrast, the reset current decreased with the increasing Se concentration. These results demonstrate that Se-doped Ge10Sb90 is a highly promising material for PCM applications.</P></▼2>