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Kim, Jeonghyun,Song, Taeseup,Park, Hyunjung,Yuh, Junhan,Paik, Ungyu American Scientific Publishers 2014 Journal of Nanoscience and Nanotechnology Vol.14 No.10
<P>The Li2MnSiO4 is a promising candidate as a cathode for lithium ion batteries due to its large theoretical capacity of 330 mA h g(-1) and high thermal stability. However, the problems related to low electronic conductivity and large irreversible capacity at the first cycle limits its practical use as a Li-ion cathode material. We have developed a carbon coated Li2MnSiO4-graphene composite electrode to overcome these problems. Our designed electrode exhibits high reversible capacity of 301 mA h g(-1), with a high initial coulombic efficiency, and a discharge capacity at current rate of 0.5 C, that is double value of carbon coated Li2MnSiO4-carbon black composite electrode. These significant improvements are attributed to fast electron transport along the graphene sheet.</P>
Kim, Tae Kyung,Lee, Kyung Joo,Yuh, Junhan,Kwak, Sang Kyu,Moon, Hoi Ri The Royal Society of Chemistry 2014 NEW JOURNAL OF CHEMISTRY Vol.38 No.4
<P>The core–shell structures have attracted attention in catalysis, because the outer shells isolate the catalytically active NP cores and prevent the possibility of sintering of core particles during catalytic reaction under physically and chemically harsh conditions. We aimed to adopt this core–shell system for CO<SUB>2</SUB> sorption materials. In this study, a composite material of multi-core 3 nm-sized magnesium oxide nanoparticles embedded in porous carbon nanospheres (MgO NPs@C) was synthesized by a gas phase reaction <I>via</I> a solvent-free process. It showed selective CO<SUB>2</SUB> adsorption capacity over N<SUB>2</SUB> under mild regeneration conditions.</P> <P>Graphic Abstract</P><P>A composite material of 3 nm magnesium oxide nanoparticles embedded in carbon nanospheres showed selective CO<SUB>2</SUB> adsorption capacity over N<SUB>2</SUB>. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4nj00067f'> </P>
Kim, Hyunjung,Park, Jingyu,Jeon, Heeyoung,Jang, Woochool,Jeon, Hyeongtag,Yuh, Junhan American Institute of Physics 2015 Journal of Vacuum Science & Technology. A Vol.33 No.5
<P>Diffusion barrier characteristics of tungsten-nitride-carbide (WNxCy) thin films interposed between Cu and SiO2 layers were studied. The WNxCy films were deposited by remote plasma atomic layer deposition (RPALD) using a metal organic source, (Cp-Me)W(CO)(2)(NO), and ammonia. Auger electron spectroscopy analysis indicated the WNxCy films consisted of tungsten, nitrogen, carbon, and oxygen. X-ray diffraction (XRD) analysis showed that the film deposited at 350 degrees C was nanocrystalline. The resistivity of WNxCy film deposited by RPALD was very low compared to that in previous research because of the lower nitrogen content and different crystal structures of the WNxCy. To verify the diffusion barrier characteristics of the WNxCy film, Cu films were deposited by physical vapor deposition after WNxCy film was formed by RPALD on Si substrate. The Cu/WNxCy/Si film stack was annealed in a vacuum by rapid thermal annealing at 500 degrees C. Cu diffusion through the barrier layer was verified by XRD. Stable film properties were observed up to 500 degrees C, confirming that WNxCy film is suitable as a Cu diffusion barrier in microelectronic circuits. VC 2015 American Vacuum Society.</P>