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진공증착법에 의한 Bismuth Telluride 박막의 제작 및 물성
황삼규 ( Samgyu Hwang ),홍기민 ( Kimin Hong ) 충남대학교 기초과학연구원 2021 충남과학연구지 Vol.38 No.1
Bismuth Telluride(BiTe) is a material which is widely used in thermoelectric devices in the room temperature range because of its high conversion efficiency. We fabricated Bismuth Telluride thin films by using a thermal evaporation method and measured electrical resistivity of them from 80 K to 500 K. We also observed the effects of high temperature annealing of the films on the changes in electrical resistivity. By using X-ray diffraction and scanning electron microscopy-energy dispersive spectrometer, we investigated the crystallinity and composition of the BiTe thin films.
진공증착 방법으로 제작한 구리, 알루미늄 박막의 전기적 특성
김민성 ( Minsung Kim ),홍기민 ( Kimin Hong ) 충남대학교 기초과학연구원 2022 충남과학연구지 Vol.39 No.1
Copper and aluminum are high conductivity materials and relatively easy to obtain than silver or gold, which are also known as good-electric materials. Because of these characteristics, copper and aluminum are used for metallization in semiconductor fabrication process. In order to identify these physical properties, thin films of copper and aluminum were fabricated by a vacuum deposition method. We measured the resistivity in the temperature range of 80-500 K using a Hall effect measurement system. The crystalline orientations were identified by using a X-ray diffraction method. The surface morphology and composition of the thin films were investigated through scanning electron microscopy and energy dispersive spectrometry.
진공증착 방법을 이용하여 제작한 크롬 박막의 전기전도 특성
배유리 ( Yuri Bae ),홍기민 ( Kimin Hong ) 충남대학교 기초과학연구원 2021 충남과학연구지 Vol.38 No.1
We made use of a thermal evaporation method to fabricate high purity Cr thin films. The electrical resistivity of the films was measured between 80 and 500 K by using a Hall effect measurement system. The variation of the resistivity strongly depended on the film thickness and species of the substrate. In general, thick Cr films exhibited metallic properties while relatively thin films showed semiconducting behavior.
유기첨가제에 의한 전기도금 니켈 - 구리 박막의 물성변화
이정주(Jungju Lee),홍기민(Kimin Hong) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.3
We investigated the effects of organic additives on the properties of nickel-copper thin films prepared by electroplating. Compared with thin films fabricated by pure electrolyte only, the films utilizing organic additives show different crystalline orientations. With no alteration of plating conditions simply adding the organic materials changed the composition of copper and nickel. The concentration of nickel could be varied to 65-95% depending on the species and concentration of the additives. The change of material property has contributed to the increase or decrease of the magnetoresistance.
전해액 내 사카린의 농도 변화에 의한 전기도금 니켈-철 퍼멀로이 박막의 미세구조와 자기적 특성 변화
이호준(Hojun Lee),방원배(Wonbae Bang),홍기민(Kimin Hong),고영동(Young-Dong Ko),정진석(Jin-Seok Chung),이희복(Heebok Lee) 한국자기학회 2009 韓國磁氣學會誌 Vol.19 No.4
We studied the effects of Saccharin on the properties of electroplated Ni-Fe Permalloy thin films. When 0 to 1 μ㏖/L of Saccharin was added to the plating electrolyte, the grain sizes of the deposits are found to decrease, which reduces the surface roughness and the coercivity and increases the permeability and magnetoimpedance. The reduction in the grain sizes is strongly correlated with increases in the incremental permeability and the magnetoimpedance. We demonstrated that Saccharine is a useful additive for the electrodeposition of soft Permalloy thin films and that the softness can be adjusted by varying the concentration of Saccharin.
충남대 잔디밭 토양 중 <sup>40</sup>K과 <sup>137</sup>Cs의 방사능 농도 및 경년 변화
김진아 ( Jina Kim ),노형아 ( Hyungah Noh ),홍기민 ( Kimin Hong ) 충남대학교 기초과학연구원 2022 충남과학연구지 Vol.39 No.1
The radioactivity levels of <sup>40</sup>K(Potasium) and <sup>137</sup>Cs(Caesium) in the soil in Chungnam National University were measured using a high-growth ray spectrometry system consisting of a detector (HPGe, High Purity Germanium) and a multi-wave analyzer. The radioactivity level of <sup>40</sup>K in the topsoil in the second half of 2022 in Chungnam National University(CNU), was 863 Bq/kg-dry and the radioactivity level of <sup>137</sup>CS was lower than the minimum detectable activity(MDA). The radioactivity level of <sup>40</sup>K in the subsoil was 882 Bq/kg-dry, and the radioactivity level of <sup>137</sup>Cs was not detected. This is a value that does not deviate from the direction of secular change in radiation levels.
도금용 억제제가 도금 구리 박막의 반사율에 미치는 영향
서호영(Hoyoung Suh),허미나(Mina Heo),홍기민(Kimin Hong) 한국물리학회 2022 새물리 Vol.72 No.5
구리도금용 전해액에 유기첨가제인 Ralufon#14을 가하여 평판 구리 박막을 제작하고 구리 박막의 결정구조, 입도, 비저항, 표면거칠기 및 반사계수를 분석하였다. 전해액만으로 도금한 구리 박막에 비해 Ralufon#14을 첨가하면 구리의 결정성과 표면거칠기가 변화하며 비저항이 크게 감소한다. 또한 순수 전해액으로만 제작한 구리 박막과 비교하였을 때 Ralufon#14를 첨가하여 제작한 구리 박막의 반사계수는 크게 증가한다. Ralufon#14의 첨가 여부는 도금 구리 박막의 물성에는 큰 변화를 야기하지만 그 변화는 Ralufon#14의 농도에는 의존하지 않는다. We have fabricated copper thin films by using an electroplating method. Specifically, we added an organic additive, Ralufon#14, in the plating electrolyte and observed the variation of the material property of the plated copper caused by Ralufon#14 in the electrolyte. By the addition of Ralufon#14 the crystalline orientation, grain size, and electrical resistivity changed significantly. In addition, compared to the thin films plated with pure electrolyte, the films prepared with Ralufon#14 exhibited considerable increase of the optical reflectance. The changes in crystalline orientation, grain size, and optical reflectance do not show noticeable variation when we increase the concentration of Ralufon#14 in the electrolytes.
서호영(Hoyoung Seo),남경호(Kyung-Ho Nam),홍기민(Kimin Hong) 한국자기학회 2012 韓國磁氣學會誌 Vol.22 No.2
We have studied a means to control the composition of nickel-iron thin films. By changing current and voltage applied to a electroplating electrolyte we could manipulate the relative concentration of nickel and iron in the thin films, which caused variations of coercivity, squareness, and saturation magnetic field. As we increase the content of iron in the thin films by using potentiostatic and galvanostatic plating, the grain size was increased and the coercivity was reduced.