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  1. No Access

    Article

    Invited paper: Dielectric properties of CaCu3Ti4O12 polycrystalline ceramics

    We investigated the relationship between the microstructures and dielectric properties of various CaCu3Ti4O12 (CCTO) polycrystalline ceramics sintered in air. An abrupt increase in the dielectric constant (ɛ ...

    Sung Yun Lee, Youn Woo Hong, Sang Im Yoo in Electronic Materials Letters (2011)

  2. No Access

    Article

    The changes of morphology and composition in Cu(In1−xGax)Se2 powder synthesis by solvothermal method

    To prepare the thin film solar cell by the screen printing method, the synthesis of nano CIGS powder has been frequently studied. Especially, the solvothermal method is normally used in the synthesis of CIGS. ...

    Sin-Il Gu, Hyo-Soon Shin, Youn-Woo Hong, Dong-Hun Yeo… in Metals and Materials International (2012)

  3. No Access

    Article

    Molten salt synthesis of La0.8Sr0.2MnO3 powders for SOFC cathode electrode

    For La0.8Sr0.2MnO3 (LSM) perovskite, used as the cathode material for solid oxide fuel cells (SOFC), it is known that the formation of a triple-phase-boundary is restrained due to the formation of a second phase ...

    Sin-il Gu, Hyo-soon Shin, Youn-woo Hong, Dong-hun Yeo… in Metals and Materials International (2012)

  4. No Access

    Article

    Fabrication and Characterization of Colossal Dielectric Response of Polycrystalline Ca1-x SrxCu3Ti4O12 (0≤x≤1) Ceramics

    We report the microstructures and dielectric properties of Ca1-x SrxCu3Ti4O12 (C1-xSx CTO, 0≤x≤1) ceramics sintered at the various sintering temperatures ranging from 1000 to 1060˚C in air. The linear increase in...

    Sung Yun Lee, Duk-Keun Yoo, Jihye Lee, William Jo… in MRS Online Proceedings Library (2012)

  5. No Access

    Article

    Scalable energetic-impact deposition of a mixture composed of multi-walled carbon nanotubes and silver nanoparticles

    Homogeneous nanocomposite films composed of multi-walled carbon nanotubes (CNTs) and silver (Ag) nanoparticles were produced by using energetic-impact deposition (EID). The EID process of a mixture composed of...

    Jeongho Kim, Heon Kang, Seung Hun Huh… in Journal of the Korean Physical Society (2013)

  6. No Access

    Article

    Improved dielectric properties of BaTiO3-added CaCu3Ti4O12 polycrystalline ceramics

    The effects of the BaTiO3 (BTO) additive on the electrical properties of CaCu3Ti4O12 (CCTO) polycrystalline ceramics were systematically investigated. Various amounts of BTO powder up to 15 mol. % were added to C...

    Hui Eun Kim, Soon-Mi Choi, Sung-Yun Lee, Youn-Woo Hong… in Electronic Materials Letters (2013)

  7. No Access

    Article

    Admittance spectroscopy and electrical properties of Co3O4-doped ZnO

    The varistor characteristics of 0.1–3.0 at. % Co-doped ZnO have been investigated. Three kinds of deep bulk trap levels of 0.16, 0.25, and ~0.31 eV were identified as donor levels by admittance spectroscopy. O...

    Youn-Woo Hong, Young-** Lee, Sei-Ki Kim, Jong-Hoo Paik… in Electronic Materials Letters (2014)

  8. No Access

    Article

    Sintering and optical properties of transparent ZnS ceramics by pre-heating treatment temperature

    The main objective of our work is to increase transmittance in the mid infrared region by removing impurities through the pre-heating treatment of zinc sulfide (ZnS) produced by hydrothermal synthesis. The pre...

    Seo-Yeong Yeo, Tae-Hyeong Kwon, Chang-Sun Park, Chang-Il Kim… in Journal of Electroceramics (2018)