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PdOx가 도핑된 나노 기공구조 SiO<sub>2</sub>/Si 기반의 수소 게터 제작 및 특성평가
엄누시아,임효령,최요민,정영훈,조정호,좌용호,Eom, Nu Si A,Lim, Hyo Ryoung,Choi, Yo-Min,Jeong, Young-Hun,Cho, Jeong-Ho,Choa, Yong-Ho 한국재료학회 2014 한국재료학회지 Vol.24 No.11
The existing metal getters are invariably covered with thin oxide layers in air and the native oxide layer must be dissolved into the getter materials for activation. However, high temperature is needed for the activation, which leads to unavoidable deleterious effects on the devices. Therefore, to improve the device efficiency and gas-adsorption properties of the device, it is essential to synthesize the getter with a method that does not require a thermal activation temperature. In this study, getter material was synthesized using palladium oxide (PdOx) which can adsorb $H_2$ gas. To enhance the efficiency of the hydrogen and moisture absorption, a porous layer with a large specific area was fabricated by an etching process and used as supporting substrates. It was confirmed that the moisture-absorption performance of the $SiO_2/Si$ was characterized by water vapor volume with relative humidity. The gas-adsorption properties occurred in the absence of the activation process.
Injection 온도 및 합성시간에 따른 CdSe 양자점 합성 및 특성
엄누시아,김택수,좌용호,김범성,Eom, Nu-Si-A,Kim, Taek-Soo,Choa, Yong-Ho,Kim, Bum-Sung 한국재료학회 2012 한국재료학회지 Vol.22 No.3
Compared with bulk material, quantum dots have received increasing attention due to their fascinating physical properties, including optical and electronic properties, which are due to the quantum confinement effect. Especially, Luminescent CdSe quantum dots have been highly investigated due to their tunable size-dependent photoluminescence across the visible spectrum. They are of great interest for technical applications such as light-emitting devices, lasers, and fluorescent labels. In particular, quantum dot-based light-emitting diodes emit high luminance. Quantum dots have very high luminescence properties because of their absorption coefficient and quantum efficiency, which are higher than those of typical dyes. CdSe quantum dots were synthesized as a function of the synthesis time and synthesis temperature. The photoluminescence properties were found strongly to depend on the reaction time and the temperature due to the core size changing. It was also observed that the photoluminescence intensity is decreased with the synthesis time due to the temperature dependence of the band gap. The wavelength of the synthesized quantum dots was about 550-700 nm and the intensity of the photoluminescence increased about 22~70%. After the CdSe quantum dots were synthesized, the particles were found to have grown until reaching a saturated concentration as time increased. Red shift occurred because of the particle growth. The microstructure and phase developments were measured by transmission electron microscopy (TEM) and X-ray diffractometry (XRD), respectively.
Se 전구체 함량 따른 CdSe 양자점 형광체의 발광특성
엄누시아,김택수,좌용호,김범성,Eom, Nu Si A,Kim, Taek-Soo,Choa, Yong-Ho,Kim, Bum Sung 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.6
The quantum dots (QD) have unique electrical and optical properties due to quantum dot confinement effect. The optical properties of QDs are decided by various synthesis conditions. In a prior QDs study, a study on the QDs size with synthesis condition such as synthesis time and temperature is being extensively researched. However, the research on QDs size with composition ratio has hitherto received scant attention. In order to evaluate the ratio dependence of CdSe crystal, synthesis ratio of Se precursor is changed from 16.7 mol%Se to 44 mol%Se. As the increasing Se ratio, the band gap was increased. This is caused by red shift of emission. We confirmed optical property of CdSe QDs with composition ratio.
전기방사 공정을 이용하여 1차원 Nd<sub>2</sub>Fe<sub>14</sub>B섬유로부터의 Nd<sub>2</sub>Fe<sub>14</sub>B 자석분말 합성
엄누시아,노수,학 무하마드 아닉,김범성,Eom, Nu Si A,Noh, Su,Haq, Muhammad Aneeq,Kim, Bum Sung 한국분말야금학회 2019 한국분말재료학회지 (KPMI) Vol.26 No.6
Magnetic 0-D Nd<sub>2</sub>Fe<sub>14</sub>B powders are successfully fabricated using 1-D Nd<sub>2</sub>Fe<sub>14</sub>B nanowire formed by an efficient and facile electrospinning process approach. The synthesized Nd-Fe-B fibers and powders are investigated for their microstructural, crystallographic, and magnetic properties according to a series of subsequent heat treatments. Each heat-treatment process leads to the removal of organic impurities and the formation of the respective oxides/composites of Nd, Fe, and B, resulting in the formation of Nd<sub>2</sub>Fe<sub>14</sub>B powders. Nd-Fe-B fibers exhibit the following magnetic properties: The coercivity (H<sub>ci</sub>) of 3260 Oe, a maximum magnetization at 3T of 109.44 emu/g, and a magnetization remanence (M<sub>r</sub>) of 44.11 emu/g. This process easily mass produces hard magnetic Nd<sub>2</sub>Fe<sub>14</sub>B powders using a 1-D synthesis process and can be extended to the experimental design of other magnetic materials.
ISO TC 298에서의 희토류 분야 표준화 현황과 우리나라의 전략 및 과제
엄누시아,사다르 아바스,무하마드 아닉,무하마드 자라르,이미혜,김범성,김택수,이빈,Eom, Nu Si A,Abbas, Sardar Farhat,Aneeq, Haq Muhammad,Zarar, Rasheed Mohammad,Lee, Mi Hye,Kim, Bum Sung,Kim, Taek-Soo,Lee, Bin 한국분말재료학회 (*구 분말야금학회) 2019 한국분말재료학회지 (KPMI) Vol.26 No.3
Since the ISO decided to deal with rare-earth elements at the $298^{th}$ Technical Committee (TC) in 2015, Korea has participated in four plenary meetings and proposed four standards as of June 2019. The status of ISO TC 298, the standards covered by the TC, and the standardization strategies of Korea are summarized. Korean delegations are actively engaged in WG2, which deals with recycling, proposing four standards for fostering the rare-earth recycling industry. However, the participation of domestic experts is still low compared with the increase in the number of working groups and the number of standards in TC 298. The aim of this article is to summarize the current status of ISO international standards related to rare-earth elements, to encourage relevant experts to participate in standardization, and to develop international standards that accurately reflect the realities of the industry.
안정적 자원 확보를 위한 러시아 광물 시장 흐름 및 경제방향
엄누시아,노수,학 무하마드 아닉,이빈,임경묵,김범성,Eom, Nu Si A,Noh, Su,Haq, Muhammad Aneeq,Lee, Bin,Lim, Kyoung Mook,Kim, Bum Sung 한국분말야금학회 2019 한국분말재료학회지 (KPMI) Vol.26 No.4
With increasing demand for resources worldwide, Korea has been negotiating with resource-holding countries to achieve conservation of energy resources. Among them, Russia is the third largest resource-producing and exporting nation in the world and has several resource materials such as nickel, platinum group metals, gold, and other reserves. As a result, there is growing interest in cooperation between Korea and Russia. The aim of this article is to summarize the current status of market flow of Russian energy resources as well as Russia's economic cooperation with Korea. Notably, South Korea needs to focus on investing in overseas mines for a stable supply of rare metals. Nevertheless, securing rare metals is a major task by understanding the flow and policy direction of Russian material mines.
석탄바닥재로 제조된 결정화 유리의 물리적 특성에 미치는 Li<sub>2</sub>O 첨가 영향
엄누리,강승구,Um, Noo-Li,Kang, Seung-Gu 한국재료학회 2010 한국재료학회지 Vol.20 No.2
Glass-ceramics were fabricated by heat-treatment of glass obtained by melting a coal bottom ash with $Li_2O$ addition. The main crystal grown in the glass-ceramics, containing 10 wt% $Li_2O$, was $\beta$-spodumene solid solution, while in $Li_2O$ 20 wt% specimen was mullite, identified using XRD. The activation energy and Avrami constant for crystallization were calculated and showed that bulk crystallization behavior will be predominant, and this expectation agreed with the microstructural observations. The crystal phase grown in $Li_2O$ 10 wt% glass-ceramics had a dendrite-like shaped whereas the shape was flake-like in the 20 wt% case. The thermal expansion coefficient of the $Li_2O$ 10 wt% glass-ceramics was lower than that of the glass having the same composition, owing to the formation of a $\beta$-spodumene phase. For example, the thermal expansion coefficient of $Li_2O$ 10 wt% glass-ceramics was $20\times10^{-7}$, which is enough for application in various heat-resistance fields. But above 20 wt% $Li_2O$, the thermal coefficient expansion of glass-ceramics, on the contrary, was higher than that of the same composition glass, due to formation of mullite.
응력 주입 층을 이용한 Kerf-less 웨이퍼링 기술 동향
양현석,엄누시아,김지원,임재홍 한국세라믹학회 2018 세라미스트 Vol.21 No.2
In the photovoltaics (PV) industry, there were many efforts to reduce the cost of production with high efficiency. The single most important cost factor in silicon technology is the wafer, accounting presently for ~35% of the module cost. it was already shown that the solar cell efficiency can be maintained up to the thickness range of 40-60μm. The direct production of ultra-thin silicon wafer is very attractive and numerous different techniques, such as electrochemical process, ion implantation, and epitaxial growth, have been proposed and developed in many academic and industrial laboratories.