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실리콘 이온주입 SiO_2층의 나노결정으로 부터의 광루미네센스
김광희,오항석,장태수,권영규,이용현 한국센서학회 2002 센서학회지 Vol.11 No.3
실리콘 기판 위에 형성한 열산화막에 실리콘이온을 주입하고 열처리를 수행한 후, 광루미네센스(photoluminescence:PL) 스펙트럼을 조사하였다. 실리콘 이온도즈의 변화와 열처리 온도의 변화에 따른 PL스펙트럼을 조사하고, 이를 TEM과 XRD 데이터와 비교하여 분석한 결과, 광루미네센스 특성은 산화막내의 실리콘 나노결정으로부터 기인함을 알 수 있었다. 또 산화막을 1분 간격으로 습식 식각하면서 매 식각 시마다 PL스펙트럼을 관측하여 그 변화를 조사하였다. 이러한 실험을 통하여 산화막내에 분포하고 있는 실리콘 나노결정의 크기와 그 수가 PL피크 파장과 강도에 직접적으로 영향을 줌을 알 수 있었다. Photoluminescence(PL) properties of Si^+ -implanted SiO_2 film, which was thermally grown on c-Si substrate, is reported. We have compared room temperature photolurninescence (PL) spectra of the samples which was made in several kinds of implantation, subsequent annealing and SiO_2 film thickness. XRD data was correlated with the PL spectra. Silicon nanocrystals in SiO_2 film is considered as the origin of the photoluminescence. PL spectra was investigated after wet etching of the SiO_2 film by using BOE (Buffered Oxide Etchant) at every one minute. PL peak wavelength was varied as the etching is proceeded. These results indicate that the quantity and the distribution of dominant size of Si nanocrystals in SiO_2 film seem to have a direct effect on PL spectrum.
Hang Seok Choi,Won-Seok Yang,Ji Eun Lee,Yong Chil Seo,Jang-Soo Lee,Heung-Min Yoo,Jun-Kyung Park,Se-Won Park,Ki-Bae Lee,Woo-Hyun Kim 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.4
The physicochemical characteristics of automobile shredder residue (ASR) and its melting slag were investigated: In particular, the applicability of ASR as a reducing agent to the black copper recovery process. ASR is classified into three types after the shredding process: heavy fluff, light fluff and glass and soil. In this study, the portions of heavy fluff, light fluff and glass and soil in the ASR were 89.2 wt%, 8.1 wt% and 2.7wt%, respectively. Physicochemical analysis revealed that moisture and fixed carbon content were low in heavy and light fluffs, and combustible content was the highest. The higher heating value (HHV) of light fluff was 6,607 kcal/kg, and the HHV of heavy fluff was 5,312 kcal/kg. To sum up, the separation of black copper and discard slag mostly seems to be affected by the melting temperature. Therefore, if basicity and melting temperature are properly controlled, the ASR can be used as a reducing agent in the smelting process of black copper recovery. Moreover, the possibility of black copper recovery from ASR and heavy metal poisoning is evaluated.
흐름 반응기에서 전자빔에 의한 방향족 휘발성 유기화합물의 분해
장재혁,배준석,김병남,박완식,김숙동,원양수,한도흥 한국공업화학회 2003 응용화학 Vol.7 No.1
Oxidative decomposition of aromatic volatile organic compounds(VOCs), toluene and chlorobenzene, were tested in flow reactor under the irradiation of electron bcam. The maximum flow rate and concentration were 20 1/min and 1000 ppm on a basis of volume, respectively. The radistion was carried out under atmospheric pressure and room tempcrature. Main carrier gas was air, and to improve the removal efficiency of VOC, hydrogen pcroxide was added into the mixture of air and VOC.In this work, the removal cfficiencies werc 87.6% and 67.4% at 120 kGy for 100 ppm of toluene and chlorobenzene, respectively As increasing initial concentration of VOC , higher dosage was required for removal of the VOCs.When pure oxtgen being used instead of air, the removal efficiency could be increased additionally by about 40% for high concentrations of VOC . Addition of 28% aqueous hydrogen peroxide could improve the removal efficiency for VOCs. A largc amount of acrosol. which molecular weight may be much higher molecular weight than VOCs, was produced in a course of oxidative decomposition of VOCs.