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Coaxial RuO<sub>2</sub>–ITO Nanopillars for Transparent Supercapacitor Application
Ryu, Ilhwan,Yang, MinHo,Kwon, Hyemin,Park, Hoo Keun,Do, Young Rag,Lee, Sang Bok,Yim, Sanggyu American Chemical Society 2014 Langmuir Vol.30 No.6
<P>Supercapacitive properties of ruthenium oxide (RuO<SUB>2</SUB>) nanoparticles electrodeposited onto the indium tin oxide (ITO) nanopillars were investigated. Compared to conventional planar current collectors, this coaxially nanostructured current collector–electrode system can provide increased contact for efficient charge transport, and the internanopillar spacing allows easy access of electrolyte ions. The morphological and electrochemical properties depended on the thickness of the RuO<SUB>2</SUB> layers, i.e., the number of electrodeposition cycles. A maximum specific capacitance, <I>C</I><SUB>sp</SUB>, of 1235 F/g at a scan rate of 50 mV/s was achieved for the 30-cycle deposited RuO<SUB>2</SUB>–ITO nanopillars. The other capacitive properties such as electrochemical reversibility and <I>C</I><SUB>sp</SUB> retention at high scan rates also improved greatly.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2014/langd5.2014.30.issue-6/la4044599/production/images/medium/la-2013-044599_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la4044599'>ACS Electronic Supporting Info</A></P>
Effective surface oxidation of polymer replica molds for nanoimprint lithography
Ryu, Ilhwan,Hong, Dajung,Yim, Sanggyu Springer 2012 NANOSCALE RESEARCH LETTERS Vol.7 No.1
<P>In nanoimprint lithography, a surface oxidation process is needed to produce an effective poly(dimethylsiloxane) coating that can be used as an anti-adhesive surface of template molds. However, the conventional photooxidation technique or acidic oxidative treatment cannot be easily applied to polymer molds with nanostructures since surface etching by UV radiation or strong acids significantly damages the surface nanostructures in a short space of time. In this study, we developed a basic oxidative treatment method and consequently, an effective generation of hydroxyl groups on a nanostructured surface of polymer replica molds. The surface morphologies and water contact angles of the polymer molds indicate that this new method is relatively nondestructive and more efficient than conventional oxidation treatments.</P>
류영수(Youngsoo Ryu),이일환(Ilhwan Lee),김수연(Su Youn Kim),김미(Mee Kim) 한국정책분석평가학회 2017 政策分析評價學會報 Vol.27 No.3
This study proposes the goal attainment model to evaluate R&D policy effectiveness and applies the evaluation model to The Comprehensive Plan for Basic Research Promotion (2008∼2012). It is assessed how the plan s objectives are achieved and main tasks actually influence on them. All investment and performance objectives were not achieved in 2012. Moreover, only five main tasks among total eighteen tasks contained direct activities related to the objectives which they have only a little impact on. It was due to vague plan and management, main tasks not related to the objectives and not done on right time, and so on. This study suggests that the basic R&D policy should consider retaining exceptional researchers in the university as well as promoting active R&D.