Jung-Keun Yoo

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Porous silicon nanowire is fabricated by a simple electrospinning process combined with a magnesium reduction; this material is investigated for use as an anode material for lithium rechargeable batteries. We find that the porous silicon nanowire electrode from the simple and scalable method can deliver a high reversible capacity with an excellent cycle(More)
Korea Atomic Energy Research Institute (KA 305-600, Korea Department of Materials Science and Eng Materials, Seoul National University, 599 Korea. E-mail: matlgen1@snu.ac.kr Center for Nanoparticle Research, Instit University, Seoul 151-742, Korea Department of Materials Science and Engine and Technology (KAIST), 291 Daehak-ro, Yu Materials and Process(More)
User safety is one of the most critical issues for the successful implementation of lithium ion batteries (LIBs) in electric vehicles and their further expansion in large-scale energy storage systems. Herein, we propose a novel approach to realize self-extinguishing capability of LIBs for effective safety improvement by integrating temperature-responsive(More)
Ultrafine, uniform nanostructures with excellent functionalities can be formed by self-assembly of block copolymer (BCP) thin films. However, extension of their geometric variability is not straightforward due to their limited thin film morphologies. Here, we report that unusual and spontaneous positioning between host and guest BCP microdomains, even in(More)
The fast and accurate identification of unknown liquids is important for the safety and security of human beings. Recently, sensors based on the localized surface plasmon resonance (LSPR) effect demonstrated an outstanding sensitivity in detecting chemical and biological species. In the present study, we suggest that a dual-responsive nanocomposite composed(More)
The facile synthesis of silicon nanotubes using a surface sol-gel reaction on pyridine nanowire templates is reported and their performance for energy storage is investigated. Organic-inorganic hybrid pyridine/silica core-shell nanowires prepared using surface sol-gel reaction were converted to silica nanotubes by pyrolysis in air; this was followed by the(More)
Na/FeSx batteries have remarkable potential applicability due to their high theoretical capacity and cost-effectiveness. However, realization of high power-capability and long-term cyclability remains a major challenge. Herein, ultrafine Fe7 S8 @C nanocrystals (NCs) as a promising anode material for a Na-ion battery that addresses the above two issues(More)
Department of Materials Science and Engine and Technology (KAIST), 291 Daehak-ro, Y Korea. E-mail: ysjung@kaist.ac.kr Center for Nanomaterials and Chemical Re Daejeon 305-701, Republic of Korea † Electronic supplementary information spectra of the dual-responsive nanoc surrounding media, the change of peak p parameter, and classication of liquids d DOI:(More)
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