• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2015.11a
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• pp.158-158
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• 2015

전해동박(Electrodeposited Copper Foil)은 전기도금 공정으로 제조되는 얇은 구리 포일로서, 주로 TV, PC, 스마트폰 등 전자제품의 인쇄회로기판에서 전기신호를 전달하는 회로소재로 사용이 되며, 최근에는 모바일 IT, 전기자동차, 지능형 로봇, 그린 에너지 산업 등에서 필수적으로 적용되는 소재로 이용이 급증하고 있는 핵심소재이다. 모바일, Network 고속 통신 기술의 발전에 따라 Data 사용량의 폭증으로 고속/고주파 신호전송이 필요성이 증대되고 있으며 무선 충전 기술의 도입 및 웨어러블 기기의 보급으로 점차 FCCL도 3layer에서 2layer로 점차 그 수요가 바뀌어 가고 있다. 이에 따라 전해동박도 고속/고주파 신호 전송 및 고밀도 특성에 맞추어 저조도, 고밀착력 특성을 요구되는 방향으로 개발 되고 있으며 Line Space 가 기존 $25{\mu}m/25{\mu}m$ 패턴에서 $20{\mu}m/20{\mu}m$ 패턴으로 Fine pitch를 요구함에 따라 전해동박의 박막화, 저조도 고 밀착력 특성이 더 요구되고 있다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2013.05a
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• pp.37-37
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• 2013

무전해도금법 (electroless plating)은 Brenner와 Riddell이 1946년에 처음으로 환원제를 이용한 금속의 침적을 electroless plating이라고 명명한 뒤 전기를 이용하지 않고 금속막을 얻을 수 있는 방법으로 인지되어왔다. 초기에는 용액이 불안정하였으나 용액의 안정성을 향상시키면서 꾸준히 산업체에 쓰여왔다. 무전해도금의 응용이 처음에는 니켈에 국한되었으나 구리의 무전해도금이 PCB에 사용되면서 80년대부터 전자산업에서 많이 쓰이게 되었다. 최근에는 무전해도금을 이용한 전자산업뿐만 아니라 MEMS와 같이 전기도금을 위한 전기접촉이 어려우면서 정밀한 균일도를 요구하는 분야에도 많이 쓰이고 있다. 본 발표에서는 무전해도금법의 일반적인 원리와 이를 이용한 IT 산업에서의 응용에 대하여 알아본다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2015.05a
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• pp.57-57
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• 2015

전해동박(Electrodeposited Copper Foil)은 전기도금 공정으로 제조되는 얇은 구리 포일로서, 주로 TV, PC, 스마트폰 등 전자제품의 인쇄회로기판에서 전기신호를 전달하는 회로소재로 사용이 되며, 최근에는 모바일 IT, 전기자동차, 지능형 로봇, 그린 에너지 산업 등에서 필수적으로 적용되는 소재로 이용이 급증하고 있는 핵심소재이다. FPCB/PCB용 전해동박은 최근 휴대폰, PC와 더불어 전 세계적으로 열풍이 불고 있는 스마트폰, 태블릿 등의 최신 전자 모바일기기의 보급이 가속화됨에 따라 해당 제품들의 다기능화, 고집적화가 진행되고 있으며, 5G 이후의 Mobile 기기를 중심으로 하는 차세대 전자기기의 소재 분야의 선점을 위해서 광폭(600 mm 이상) 제품 제조가 가능한 전해 동박으로 다양한 표면처리의 $18{\sim}2{\mu}m$ 급의 얇은 두께를 갖는 경제성이 확보된 고특성 동박이 필요로 되는 상황이다. 이와 더불어 PCB/FPCB에서 요구하는 동박기술의 소개 및 현재 연구 개발 Trend를 소개하고자 한다.

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2005.09a
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• pp.31-34
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• 2005

분자 위치제어 메모리 시스템에 대하여 고전적인 분자동역학을 이용하여 결합에너지 및 다양한 외부전압의 형태에 따른 셔틀 풀러렌 동작에 관하여 연구하였다. 단일 나노피포드 형(single-nanopeapod type)은 질화붕소 나노튜브(boron-nitride nano tube) 속에 세 개의 엔도풀러렌(endo-fullerene)과 양쪽 끝에 구리 전극이 채워져 있는 구조를 갖고 있는 구조를 갖고 있다. 결론적으로, 분자동역학 시뮬레이션 결과로부터 이 나노메모리 시스템은 비휘발성임을 알 수 있었다. 안정적인 bit 변화를 위해서는 단일 나노피포드 형은 0.1 eV/$\AA$ 외부전압이 필요로 함을 알 수 있었다.

• Journal of the Korean Chemical Society
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• v.29 no.2
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• pp.178-182
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• 1985

The purpose of this study was to develop a separation method of Zn(II), Cu(II) and Mg(II), by ion exchange chromatography using cation exchange resion (Dowex 50w${\times}$8, 80-100 mesh) and anion exchange (Amberlite IRA-400). Ion exchange resions were packed into 25 ${\times}$ 2cm ID column and flow rate was controlled to 0.30 ml/min. Good eluents for separation of nonferrous metal ions such as Zn(II), Cu(II), Mg(II) were as follow: 0.5M $NaNO_3$ (pH 3.1), 0.2~0.5M HCl + 50~60% Acetone, and 1M HAc + 0.1M NaAcf(pH 3.7) aqueous solution. The mixed solution of 0.1M NaAc(pH 3.7), 0.5M HCl + 50% Acetone were found to be the best eluent for step elution. Analysis of metals were determined by atomic absorption spectrophotometer. In addition, separated Zn(II) fraction was obtained by eluted with 0.12N HCl and 1.5N $NH_4OH$ aqueous solution. This solution was titrated by the E. D. T. A.

• Spatial Information Research
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• v.20 no.4
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• pp.17-27
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• 2012

This study was performed to evaluate the spatial distribution of heavy metals using principal component analysis and Ordinary Kriging technique in the Gangwon Mine site. In the soils from the sub soil, the contents of Zn and Ni in the PC1 were gradually dispersed from south to north direction, while the components of Cd and Hg in the PC2 showed an increase significantly from middle-south area in the Gangwon Mine site. According to the cluster analysis, pollutant metals of As and Cu were presented a strong spatial autocorrelation structure in cluster D. The concentration of As was 0.83mg/kg and shown to increase from the south to north direction. The spatial distribution maps of the soil components using geostatistical method might be important in future soil remediation studies and help decision-makers assess the potential health risk affects of the abandoned mining sites.

• Korean Chemical Engineering Research
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• v.51 no.2
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• pp.181-188
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• 2013

The effect of transition metal ion exchange into UZM-9 zeolite with LTA framework on its deactivation in methanol-to-olefin (MTO) conversion was discussed. The ion exchange of copper, cobalt, nickel, and iron did not induce any notable change in the crystallinity, crystal morphology, and acidity of UZM-9. The small cage entrance of UZM-9 caused the high selectivity to lower olefins in the MTO conversion, while its large cages allowed the rapid further cyclecondensation of active intermediates, polymethylbenzenes including hexamethylbenzene, resulting in a rapid deactivation. The UZM-9 containing copper and cobalt ions showed considerably slow deactivations. The interaction between transition metal ions and polymethylbenzene cation radicals, the active intermediates, generated in the MTO conversion stabilized the radicals and slowed down the deactivation of UZM-9.

• Korean Journal of Materials Research
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• v.10 no.9
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• pp.593-600
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• 2000

This paper investigated the conduction path and conduction mechanism in undoped polycrystalline diamond thin films deposited by microwave chemical vapor deposition. The resistances measured by ac impedance spectroscopy with different directions can not be explained by the previously-known surface conduction model. The electrodeposition of Cu and electroetching of Ag experiments showed that the conduction path is the grain boundaries within the diamond films. The electodeposition of Cu with an insulating surface layer further proved that the main conduction path in polycrystalline films in the grain boundaries. The film with high electrical conductivity has low activation energy of 45meV and higher dangling bond density. By considering the results and surface C chemical bonds, the H-C-C-H bonds at surface and in grain boundaries might be the origin of high conductivity in undoped diamond films.

• Journal of the Korean Society of Food Science and Nutrition
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• v.30 no.1
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• pp.32-36
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• 2001

This study was conducted to estimate the contents of trace metals in vegetable which were produced in Korea. The levels of trace metals determined using a mercury analyzer, and ICP (inductively coupled plasma spectrometer) and an AAS (atomic absorption spectrophotometer) after wet digestion. The values of trace metals [minimum~maximum (mean), mg/kg] in vegetables were a follows ; Hg : 0.0001~0.019 (0.002), Pb : 0.001~0.28 (0.02), Cd : 0.001~0.078 (0.016), As : 0.001~0.06 (0.02), Cu : 0.06~24.81 (0.77), Mn : 0.17~15.12 (2.32), Zn : 0.13~28.70 (2.51). These results showed that metal contents in vegetables on domestic markets were similar to those reported in other countries. The weekly average intakes of lead, cadmium and mercury from vegetables take 2~7% of PTWI (Provisional Tolerable Weekly Intakes) that the FAO/WHO Joint Food Additive and Contaminants Committee had set to evaluate their safeties.

• Conservation Science in Museum
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• v.12
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• pp.35-45
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• 2011

To keep relics excavated in the era of the Japanese Colonist's rule in the Korean Peninsula in order, the National Museum of Korea selected some of horse strap pendants (Haengyeob) that were excavated from Seobongchong, Sikrichong and Geumryeongchong, and it investigated conservation and production technique. The horse strap pendants selected were classified into three, that is to say, Oval and fish-tail shape, heart shape and atypical: At the results of microscopic observation, XRF and SEM-EDS analysis, base plate was made of iron, and top plate as well as pattern plate was made of iron, copper and silver. Both Oval and fish-tail shape and heart shape horse strap pendants had horse strap pendants having same production technique and sizes at all of three ancient tombs were made of iron and copper. The gold layer of horse strap pendants except the atypical one having no gold layer were made by amalgam gilding.