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IBAD 기판을 적용한 산화물 전구체 MOD 공정에 의한 YBCO Coated Conductor의 제조
김영국,유재무,고재웅,허순영,홍계원,이희균,정형식,Kim Y. K.,Yoo J. M.,Ko J. W.,Heo S. Y.,Hong G. W.,Lee H. G.,Chung H. S. 한국초전도학회 2005 Progress in superconductivity Vol.6 No.2
YBCO coated conductors have been fabricated with a newly developed oxide-precursor-based MOD process. The precursor solution was synthesized with low cost YBCO powders as starting materials and YBCO coated conductors have been deposited on IBAD substrate ($CeO_2$/IBAD-YSZ/SS). YBCO coated conductor prepared by dip coating shows transport $I_c$ of 15A/cm-w at 77 K. Microstructural and crystallographic analyses indicate that YBCO layer was grown in epitaxy with substrate and exhibited well-developed dense microstructure. Also discussed are processing and analysis of YBCO coated conductor by slot-die web coating method. It was shown that this oxide-based MOD process provides a low cost route to coated conductor with high $J_c$.
김영국,송병관,이정구,백연경,Kim, Y.K.,Song, B.K.,Lee, J.G.,Baek, Y.K. 한국분말야금학회 2020 한국분말재료학회지 (KPMI) Vol.27 No.2
Fluorescent nanoparticles are characterized by their unique properties such as luminescence, optical transparency, and sensitivity to various chemical environments. For example, semiconductor nanocrystals (quantum dots), which are nanophosphors doped with transition metal or rare earth ions, can be classified as fluorescent nanoparticles. Tuning their optical and physico-chemical properties can be carried out by considering and taking advantage of nanoscale effects. For instance, quantum confinement causes a much higher fluorescence with nanoparticles than with their bulk counterparts. Recently, various types of fluorescent nanoparticles have been synthesized to extend their applications to other fields. In this study, State-of-the-art fluorescent nanoparticles are reviewed with emphasis on their analytical and anti-counterfeiting applications and synthesis processes. Moreover, the fundamental principles behind the exceptional properties of fluorescent nanoparticles are discussed.