• Bulletin of the Korean Chemical Society
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• 제16권2호
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• pp.126-129
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• 1995

Linear and nonlinear optical properties of CuCl nanocrystals in silica glass have been studied using low temperature absorption, degenerate four wave mixing (DFWM), and time-resolved photoluminescence spectroscopy. Assuming a spherical shape, effective radius of the CuCl quantum dots was estimated to be 2.5 nm, which is obtained from low temperature absorption data. The DFWM experiment was performed in 380-386 nm wavelength region, and the diffracted signal was measured as a function of wavelength with 1.0 nm interval. Time-resolved photoluminescence measurement was also carried out at 77 K to obtain the time response of CuCl nanocrystals. The experimental results on the large third order nonlinear optical of CuCl quantum dots are explained in terms of crystal size and oscillator strength of quantum spheres.

• 한국세라믹학회지
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• 제34권4호
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• pp.420-428
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• 1997

Alumino-borosilicate glasses containing nano-sized CuCl crystals for nonlinear optical application were prepared by the melting and precipitation process, and structural and optical properties were investigated by using XRD, TEM, SAXS, and optical spectroscopy. the average radius of the precipitated CuCl particles was about 2 nm. The blue shift of Z3 resonance peak with decreasing the precipitated CuCl particles size was found and the radius increased with decreasing the glass transition temperature of the matrix glass and with increasing the temperature and duration time of the precipitation heat treatment.

• 대한화학회지
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• 제34권1호
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• pp.37-43
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• 1990

$D_{2d}$ 점군에 속하는 강결정장의 tetragonally 일그러진 사면체 3$d^9$전자계 착물의 바닥상태에 대한 리간드 궤도함수의 spin-orbit coupling과 중심 금속의 3d와 4p궤도함수의 intermixing이 미치는 영향에 대하여 중첩 섭동론을 사용하여 연구하였다. 단결정 $Cs_2CuCl_4$의 tetragonally 일그러진 $CuCl_4^{2-}$에 대한 d-d전이의 실험값을 사용한 LCAO-MO분석은 구리이온과 리간드 사이의 공유결합성은 Cu 4p orbital의 기여가 증가하므로서 급격히 감소하고 리간드 Cl 3p궤도함수의 spin-orbit coupling 상호작용에 의한 바닥상태의 에너지 준위 분리에 대한 효과는 $\Gamma_7(E)\;\to\;\Gamma_6(E)\; >\;\Gamma_7(B_2)\;\to\;\Gamma_6(E)\; >\;\Gamma_7(B_2)\;\to\;\Gamma_7(E)$의 순서로 감소하였다.

• 대한화학회지
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• 제36권2호
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• pp.223-229
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• 1992

정사면체 구조를 갖는 $SpCuCl_2$와 수은(II) 이온 및 수은 금속간의 금속 교환반응의 속도론적인 연구를 순환 전압전류법과 자외 가시선 분광법을 사용하여 실험하였다. 수은(II) 이온 및 수은 금속과$SpCuCl_2$와의 교환 반응은 유사일차속도식을 따른다. 교환반응의 속도상수와 활성화 계수들의 값을 구하고 이들을 정리하여 나타내었다. 이러한 실험결과들로부터 Sp 배위자에 동시에 결합되어 있는 구리와 수은의 이핵 착물에서 구리와 질소간의 결합이 끊어지는 과정이 교환반응의 속도결정단계임을 알 수 있다.

• 대한화학회지
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• 제57권4호
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• pp.483-488
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• 2013

$CuCl_2$로부터 용액합성법에 의해 CuO를 제조하였다. $CuCl_2$를 용액에 첨가하기 전에 용액내에 anatase형 $TiO_2$ 입자를 분산시켜 CuO가 형성되는 과정에서 $TiO_2$/CuO 결합입자를 합성하였다. 얻어진 $TiO_2$/CuO에 적당량의 글루코스를 가하여 반응시켜 CuO의 일부를 $Cu_2O$로 환원시켰다. 얻어진 시료 $TiO_2/Cu_xO$ (1$TiO_2/Cu_xO$ 복합체는 anatase와는 다르게 가시광선 전 영역에서 흡광이 발생했으며 당연한 결과로 태양광선에서 $TiO_2/Cu_xO$ 복합체의 광촉매 활성은 anatase $TiO_2$에 비하여 매우 뛰어난 것으로 나타났다. 또한 $TiO_2/Cu_xO$ 복합체의 항균성이 대단히 뛰어난 것으로 나타났다.

• 한국토양비료학회지
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• 제26권4호
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• pp.249-252
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• 1993

인산(燐酸)을 고농도(高濃度)로 공급하였을 때, 양분의 흡수(吸收) 특히 Zn과 Cu의 흡수를 알기 위하여 온실에서 수경재배(水耕栽培)로 시험을 수행하였다. 공급 인산 수준은 0, 0.2, 0.5, 2.0, 5.0mM의 5수준(水準)이었으며, 개량뽕(Morus alva L.)을 공시품종으로 2.5개월을 재배한 후, 식물체를 수확(收穫)하여 분석(分析)하였다. 건물중(乾物重)은 2.0mM 인산수준까지 계속 증가(增加)한 후 감소(減少)하였다. 잎의 수분함량(水分含量), total-N, P, K, Fe 등은 인산 공급수준과 비례(比例)하여 증가하였다. Total-Zn 함량은 인산수준에 따라 큰 차를 보이지 않았으나, 수용성(水溶性) Zn은 증가하는 반면 Cu는 감소하였다. 인산수준(燐酸水準)의 증가에 따라 $SO_4$와 Cl는 감소하다가 인산 2.0mM 이상에서 현저히 증가하였다. 인산 축적(蓄積) 뽕밭에서의 뽕잎 감소는 Cu의 흡수 저하와 $SO_4$와 Cl의 현저할 흡수(吸收) 증가에서 오는 것으로 추정(推定)되었다.

• 한국자기학회지
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• 제5권5호
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• pp.556-560
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• 1995

The absorption properties of Cu-Zn ferrite/rubber composite microwave absorbers with PZT(Lead Zirconate Titanate) additive were evaluated. The composite specimens have prepared by molding and curing the mixture of matrix rubber and Cu-Zn ferrite powders which are synthesized by the coprecipitation method using Fe Cl/sub 3/ .center dot. 6H/sub 2/O, CuCl/sub 2/ .center dot. 2H/sub 2/O and Zn Cl/sub 2/ as a starting raw materials. PZT is used as another filler particles to adjust the material constants of Cu-Zn ferrite/rubber composite specimens. We have found that the material constants of specimens could be controlled by various PZT mixing ratio. On the Cu-Zn ferrite/rubber composite specimens with PZT 10[wt%] additive, the reflection losses were larger than 30[dB] in the frequency range from 2.72 to 4.4[GHz]' by adjusing the thickness.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 추계학술대회 논문집 학회본부
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• pp.338-341
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• 1995

The surface properties after plasma etching of Al(Si, Cu) solutions using the chemistries of chlorinated and fluorinated gases with varying the etching time have been investigated using X-ray Photoelectron Spectroscopy. Impurities of C, Cl, F and O etc are observed on the etched Al(Si, Cu) films. After 95% etching, aluminum and silicon show metallic states and oxized (partially chlorinated) states, copper shows Cu metallic states and Cu-Clx(x$CuCl_x$ (x$CuCl_x$ (1

• Electronic Materials Letters
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• 제14권6호
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• pp.712-717
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• 2018

In this letter, we have introduced copper chloride ($CuCl_2$) as an additive in the $CH_3NH_3PbI_3$ precursor solution to improve the surface morphology and crystallinity of $CH_3NH_3PbI_3$ films in a single solvent system. Our optimized perovskite solar cells (PSCs) with 2.5 mol% $CuCl_2$ additive showed best power conversion efficiency (PCE) of 15.22%. The PCE of the PSCs fabricated by $CuCl_2$ (2.5 mol%) additive engineering was 56% higher than the PSC fabricated with pristine $CH_3NH_3PbI_3$.

• 한국분말재료학회지
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• 제8권4호
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• pp.245-252
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• 2001

Recent remarkable progress in the semiconductor industry has promoted smaller size of semiconductor chips and increased amounts of heat generation. So, the demand for a substrate material to meet both the characteristics of thermal expansion coefficient and heat radiation has been on the increase. Under such conditions, tungsten(W)-copper(Cu) has been proposed as materials to meet both of the above characteristics. In the present study, the W-10wt.%Cu powders were synthesised by the mixing and hydrogen reduction of the starting mixture materials such as W-Cu, $W-CuCl_2$and $WO_3-CuCl_2$ in order to obtain the full densification. The W-10wt.%Cu produced by hydrogen reduction showed the higher interparticle friction than the simple mixed W-10wt%Cu because of the W agglomerates. In the dilatometric analysis the W-10wt.%Cu prepared from the $W-CuCl_2$was largely shrank by heating up $1400^{\circ}C$ at the constant heating rate of $5^{\circ}C$/min. The possibility of application of metal injection molding (MIM) was also investigated for mass production of the complex shaped W-Cu parts in semiconductor devices. The relationship between the temperature of molding die and the pressure of injection molding was analyzed and the heating up stage of 120-$290^{\circ}C$ in the debinding process was controlled for the most suitable MIM condition.