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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>
( Ahmed Abdal Dayem ),( Kwonwoo Song ),( Soobin Lee ),( Aram Kim ),( Ssang-goo Cho ) 생화학분자생물학회 2022 BMB Reports Vol.55 No.5
Interstitial cystitis/bladder pain syndrome (IC/BPS) is a debilitating chronic disorder characterized by suprapubic pain and urinary symptoms such as urgency, nocturia, and frequency. The prevalence of IC/BPS is increasing as diagnostic criteria become more comprehensive. Conventional pharmacotherapy against IC/BPS has shown suboptimal effects, and consequently, patients with end-stage IC/BPS are subjected to surgery. The novel treatment strategies should have two main functions, anti-inflammatory action and the regeneration of glycosaminoglycan and urothelium layers. Stem cell therapy has been shown to have dual functions. Mesenchymal stem cells (MSCs) are a promising therapeutic option for IC/BPS, but they come with several shortcomings, such as immune activation and tumorigenicity. MSC-derived extracellular vesicles (MSC-EVs) hold numerous therapeutic cargos and are thus a viable cell-free therapeutic option. In this review, we provide a brief overview of IC/BPS pathophysiology and limitations of the MSC-based therapies. Then we provide a detailed explanation and discussion of therapeutic applications of EVs in IC/BPS as well as the possible mechanisms. We believe our review will give an insight into the strengths and drawbacks of EV-mediated IC/BPS therapy and will provide a basis for further development. [BMB Reports 2022; 55(5): 205-212]
Improvement of SWCNT transparent conductive films <i>via</i> transition metal doping
Shim, Daeseob,Jung, Seung-Ho,Han, Song Yi,Shin, Kwonwoo,Lee, Kun-Hong,Han, Jong Hun Royal Society of Chemistry 2011 Chemical communications Vol.47 No.18
<P>To realize transparent conductive films based on single-walled carbon nanotubes (SWCNTs), we applied a spray coating process with transition metal doping to SWCNT networks. Schottky contacts between metallic and semiconducting SWCNTs changed to Ohmic contacts due to the reduction of metals on the SWCNT surfaces <I>via</I> direct conversion from solution.</P> <P>Graphic Abstract</P><P>Introduction of transition metals among (s-) and (m-) SWCNTs in a spray-coated transparent conductive film resulted in a dramatic increase in the conductivity without significant sacrifices in transparency. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1cc10190k'> </P>