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Park, Ji Sun,Shin, Dong Ok,Lee, Churl Seung,Lee, Young-Gi,Kim, Ju Young,Kim, Kwang Man,Shin, Kwonwoo Elsevier 2018 ELECTROCHIMICA ACTA Vol.264 No.-
<P><B>Abstract</B></P> <P>A facile method for preparing mesoporous perforated Co<SUB>3</SUB>O<SUB>4</SUB> nanoparticles with hollow channels and a thin carbon layer was newly designed and achieved with sacrificial carbon nanotube (CNT) templates. The threaded Co<SUB>3</SUB>O<SUB>4</SUB> nanoparticles on the CNTs were fabricated through a hybridization process, and a subsequent calcination process produced mesoporous perforated Co<SUB>3</SUB>O<SUB>4</SUB> nanoparticles. With a finely tuned calcination, CNTs were sacrificed to generate hollow channels in the Co<SUB>3</SUB>O<SUB>4</SUB> nanoparticles and to provide a carbon source for the formation of a few nm-thick carbon layer on the surface of the Co<SUB>3</SUB>O<SUB>4</SUB> nanoparticles simultaneously. The prepared mesoporous perforated Co<SUB>3</SUB>O<SUB>4</SUB> nanoparticles with a robust electronic conductive layer enabled not only an enhanced electrochemical reactivity from the greatly increased contact area between the electrolyte and electrode but also a high electronic conductivity of the overall electrode so that excellent electrochemical performances (1115.1 mA h g<SUP>−1</SUP> after 100 cycles; 595.9 mA h g<SUP>−1</SUP> @ 5 C rate) were successfully achieved in the anode application of a lithium-ion battery.</P>
Efficiency enhancement in a-plane InGaN/GaN light emitters with carbon nanotubes.
Song, Hooyoung,Suh, Jooyoung,Kim, Eun Kyu,Shin, Kwonwoo,Han, Jong Hun,Hwang, Sung-Min,Song, Keun Man American Scientific Publishers 2012 Journal of Nanoscience and Nanotechnology Vol.12 No.4
<P>This study investigates the coupling modes of a-plane InGaN/GaN mutiquantum wells (MQWs) with single-walled carbon nanotubes (SWCNTs). The enhancement of light emissions at resonance photon energies can be explained by the surface plasmon coupling of the MQW-SWCNT hybrid structure. The photoluminescence (PL) enhancement ratios of the indigo (2.90 eV) emission from MQWs with SWCNTs reveal three coupling modes at 2.50 eV, 2.97 eV, and 3.42 eV. In addition, the trend of the PL intensity ratios and efficiencies corresponds to that of the PL enhancement ratios. The PL efficiencies for the green (2.46 eV) and indigo (2.90 eV) emissions of SWCNT-coated MQWs are 32% and 110% better than the corresponding values of uncoated MQWs, respectively. The results show that the MQW-SWCNT hybrid structure has the potential to be applied in high-efficiency light emitters in the visible and ultraviolet range.</P>
Kim, Kyunghun,Song, Hyun Woo,Shin, Kwonwoo,Kim, Se Hyun,Park, Chan Eon American Chemical Society 2016 The Journal of Physical Chemistry Part C Vol.120 No.10
<P>In this study, we have demonstrated a novel organic-inorganic hybrid gate dielectric material, zirconium tetraacrylate (ZrTA). ZrTA gate dielectric, where inorganic Zr elements are embedded in organic acrylate matrix, takes advantage of the complementary properties of single organic or inorganic gate dielectrics. A simple spin-coating and UV-assisted cross-linking reaction of acrylate moieties allowed ZrTA film to be photopatterned The cross-linked ZrTA film by UV and heat treatments (UV, 365 nm for 3 min; heat, 120 degrees C for 30 min) showed high dielectric strength (10(-7) A/cm(2) at 2 MV/cm), and dielectric constant (5.48). In addition, surface properties of the ZrTA film (surface energy, surface roughness) were favorable for the growth of overlying pentacene organic semiconductor. Consequently, the organic thin-film transistor composed of a pentacene semiconductor and a cross-linked ZrTA gate dielectric displayed a moderately high field-effect mobility of 0.50 cm(2)/(V.s) with a negligible hysteresis transfer characteristic.</P>
Increased Environmental Stability of a Tungsten Bronze NIR-absorbing Window
Lee, Wi Hyoung,Hwang, Hyunmin,Moon, Kyunghwan,Shin, Kwonwoo,Han, Jong Hun,Um, Soong Ho,Park, Juhyun,Cho, Jeong Ho 한국섬유공학회 2013 FIBERS AND POLYMERS Vol.14 No.12
We developed a facile method for increasing the environmental stability of a tungsten bronze near-infrared (NIR)-absorbing window using tetraethyl orthosilicate (TEOS) and 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane (FDS). The environmental stability of the tungsten bronze NIR-absorbing window could be enhanced by applying a variety of protective layers (i.e., TEOS, fluoropolymer (CYTOP), FDS). The protective characteristics of each layer type are discussed. The protection of tungsten bronze surfaces by TEOS and FDS layers enormously enhanced the environmental stability of the NIR absorbing window, whereas an untreated tungsten bronze film rapidly lost its NIR absorption properties. The protection efficiency followed the order: TEOS/FDS>FDS>TEOS>CYTOP. The improved environmental stability arose from the closely packed structure of FDS, which can self-assemble on an oxide surface, such as the tungsten oxide or silicon oxide surfaces. The method developed here provides a simple, robust, and versatile way to improve the environmental stability of a NIR-absorbing window.