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Transparent Conductive Films of Copper Nanofiber Network Fabricated by Electrospinning
Kim, Sungyeoul,Lee, Hyundong,Kim, Dahye,Ko, DaAe,Kim, Dojin,Kim, Hyojin,Yoon, Soon-Gil Hindawi Limited 2015 Journal of nanomaterials Vol.2015 No.-
<P>Cu nanofiber networks can be a good alternative of the Ag nanowire of high electrical conductivity while having the advantage of low price. An electrospinning method was developed to fabricate copper nanofiber network for use as a transparent conductive film on glass substrate. The effects of liquid diluents for electrospinning processability were examined in relation to the subsequent Cu nanofiber formation processes. Electrospinning solutions of copper acetate/polyvinyl alcohol (PVA) and copper nitrate trihydrate/polyvinyl butyral (PVB) were investigated. The polymer mixing solutions influenced the subsequent annealing temperatures for removal of the polymers and reduction of the formed CuO nanofibers to Cu metal nanofibers. The morphology and structures of the formed nanofiber networks were examined by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, and so forth. The mixture with PVB provided lower annealing temperatures suitable for application to flexible substrates.</P>
Optimization of GaMnAs Growth in Low Temperature Molecular Beam Epitaxy
Kim, Kyung-Hyun,Park, Jong-Hoon,Kim, Byung-Doo,Kim, Chang-Soo,Kim, DoJin,Kim, Hyo-Jin,Ihm, Young-Eon 대한금속학회 2002 METALS AND MATERIALS International Vol.8 No.2
We present a detailed growth optimization procedure and experimental results for the growth of GaMnAs magnetic semiconductors in low-temperature molecular beam epitaxy. They were explored by using in-situ monitoring of the surface reconstruction patterns, double crystal/high-resolution x-ray diffraction, conductivity measurement, and superconducting quantum interference device measurements. The results showed strong correlations among the measurements. The room temperature conductivity measurement, in particular, was found to be a useful tool in forecasting the ferromagnetic transition temperature of the films. High quality GaMnAs films could contain Mn up to ∼5% without MnAs segregation at substrate temperatures of 215∼275℃. The highest transition temperature of 80 K, however, was measured from the sample with 3.7% Mn grown at the substrate temperature of 250℃ and As_4 pressure of 1.4×10^-6 torn for a growth rate of 0.25 ㎛/hr.
비정질 Ge<SUB>1 − x</SUB>Mn<SUB>x</SUB> 박막의 자기수송특성에 미치는 열처리 효과
김동휘(Dong Hwi Kim),이병철(Byeong Cheol Lee),찬티난안(Tran Thi Lan Anh),임영언(Young Eon Ihm),김도진(Dojin Kim),김효진(Hyojin Kim),유상수(Sang Soo Yu),백귀종(Kui Jong Baek),김창수(Chang Soo Kim) 한국자기학회 2009 韓國磁氣學會誌 Vol.19 No.4
Amorphous Ge<SUB>1 ? x</SUB>Mn<SUB>x</SUB> semiconductor thin films grown by low temperature vapor deposition were annealed at various temperatures from 400 to 700 ℃ for 3 minutes in high vaccum chamber. The electrical and magnetotransport properties of as-grown and annealed samples have been studied. X-ray diffraction patterns analysis revealed that the samples still maintain amorphous state after annealling at 500 ℃ for 3 minutes and they were crystallized when annealing temperature increase to 600 ℃. Temperature dependence of resistivity measurement implied that as-grown and annealed Ge<SUB>1 ? x</SUB>Mn<SUB>x</SUB> films have semiconductor characteristics, the increase of resistivity with annealling temperature was obseved. The 700 ℃-annealed sample exhibited negative magnetoresistance (MR) at low temperatures and the MR ratio was ~8.5% at 10 K. The asymmetry was present in all MR curves. The anomalous Hall Effect was also observed at 250 K.
Kim, Young-Won,Zhou, Tong,Ko, Eun-A,Kim, Seongtae,Lee, Donghee,Seo, Yelim,Kwon, Nahee,Choi, Taeyeon,Lim, Heejung,Cho, Sungvin,Bae, Gwanhui,Hwang, Yuseong,Kim, Dojin,Park, Hyewon,Lee, Minjae,Jang, Eunk The Korean Society of Pharmacology 2019 The Korean Journal of Physiology & Pharmacology Vol.23 No.2
Pruritus (itching) is classically defined as an unpleasant cutaneous sensation that leads to scratching behavior. Although the scientific criteria of classification for pruritic diseases are not clear, it can be divided as acute or chronic by duration of symptoms. In this study, we investigated whether skin injury caused by chemical (contact hypersensitivity, CHS) or physical (skin-scratching stimulation, SSS) stimuli causes initial pruritus and analyzed gene expression profiles systemically to determine how changes in skin gene expression in the affected area are related to itching. In both CHS and SSS, we ranked the Gene Ontology Biological Process terms that are generally associated with changes. The factors associated with upregulation were keratinization, inflammatory response and neutrophil chemotaxis. The Kyoto Encyclopedia of Genes and Genomes pathway shows the difference of immune system, cell growth and death, signaling molecules and interactions, and signal transduction pathways. Il1a, Il1b and Il22 were upregulated in the CHS, and Tnf, Tnfrsf1b, Il1b, Il1r1 and Il6 were upregulated in the SSS. Trpc1 channel genes were observed in representative itching-related candidate genes. By comparing and analyzing RNA-sequencing data obtained from the skin tissue of each animal model in these characteristic stages, it is possible to find useful diagnostic markers for the treatment of itching, to diagnose itching causes and to apply customized treatment.
Kim, Daewook,Kim, Dojin,Hong, Keum-Shik,Jung, Il Hyo Hindawi Publishing Corporation 2014 The Scientific World Journal Vol.2014 No.-
<P>The first objective of this paper is to prove the existence and uniqueness of global solutions for a Kirchhoff-type wave equation with nonlinear dissipation of the form <I>Ku</I>′′ + <I>M</I>(|<I>A</I><SUP>1/2</SUP><I>u</I>|<SUP>2</SUP>)<I>Au</I> + <I>g</I>(<I>u</I>′) = 0 under suitable assumptions on <I>K</I>, <I>A</I>, <I>M</I>(·), and <I>g</I>(·). Next, we derive decay estimates of the energy under some growth conditions on the nonlinear dissipation <I>g</I>. Lastly, numerical simulations in order to verify the analytical results are given.</P>
Kim, Dojin,Lee, Seokmin,Ko, Yongmin,Kwon, Cheong Hoon,Cho, Jinhan unknown 2018 Nano energy Vol.44 No.-
<P><B>Abstract</B></P> <P>We introduce a layer-by-layer (LbL) assembly-induced triboelectric nanogenerator (TENG) with a high and stable electric output under a wide range of humidity conditions. In this study, highly porous (cationic poly(allylamine hydrochloride) (PAH)/anionic poly(acrylic acid) (PAA))<SUB>n</SUB> multilayer films were prepared via a pH-controlled electrostatic LbL assembly with a subsequent acid treatment and were used as a mold for the triboelectric poly(dimethylsiloxane) (PDMS) replica. The electrical output of the TENGs composed of a protuberant PDMS plate and Al electrodes significantly increased based on the evolution of the nano-/micro-structured PDMS bumps. Particularly, the protuberant PDMS film molded from the porous (1.5mgmL<SUP>−1</SUP> PAH/0.5mgmL<SUP>−1</SUP> PAA)<SUB>20</SUB> multilayers displayed a high open-circuit voltage output of 242V and a short-circuit current density of 16.2μAcm<SUP>−2</SUP> under a compressive force of 90N in a relative humidity (RH) of 20%. When this hierarchical PDMS surface was additionally modified by fluorine self-assembled monolayer, the voltage output and current density of the resultant TENG at the same experimental conditions were increased up to approximately 288V and 17μAcm<SUP>−2</SUP>, respectively, exhibiting a remarkably high humidity-resistant electrical performance (16% loss of the initial voltage at 80% RH).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Triboelectric nanogenerator was based on electrostatic LbL-assembly. </LI> <LI> Electrical performance was modulated by the porosity of multilayer films. </LI> <LI> PDMS plate with hierarchical surface morphology induced highly humidity-resistant electric performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>We prepared a layer-by-layer (LbL) assembly-induced triboelectric nanogenerator (TENG) with a high and stable electric output under a wide range of humidity conditions. For this study, pH-controlled polyelectrolyte multilayer films with highly porous structure were used as a mold for PDMS replica. The electric output of the resulting TENGs were significantly increased according to the evolution of nano-/micro-structured PDMS bumps.</P> <P>[DISPLAY OMISSION]</P>