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Kim, Haeri,Moon, Seon Young,Kim, Shin-Ik,Baek, Seung-Hyub,Jang, Ho Won,Kim, Dong-Wook American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.16
<P>We investigated the influences of charge writing on the surface work function (<I>W</I>) and sheet resistance (<I>R</I>) of the LaAlO<SUB>3</SUB>/SrTiO<SUB>3</SUB> (LAO/STO) heterointerface in several gas environments: H<SUB>2</SUB>(2%)/N<SUB>2</SUB>(98%), air, N<SUB>2</SUB>, and O<SUB>2</SUB>. The decrease in <I>W</I> and <I>R</I> due to charge writing was much larger in air (Δ<I>W</I> = −0.45 eV and Δ<I>R</I> = −40 kΩ/<I>S</I>) than in O<SUB>2</SUB> (Δ<I>W</I> = −0.21 eV and Δ<I>R</I> = −19 kΩ/<I>S</I>). The reduced <I>R</I> could be maintained more than 100 h in H<SUB>2</SUB>/N<SUB>2</SUB>. Such distinct behaviors were quantitatively discussed, based on the proposed charge-writing mechanisms. Such analyses showed how several processes, such as carrier transfer via surface adsorbates, surface redox, electronic state modification, and electrochemical surface reactions, contributed to charge writing in each gas.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-16/am503367f/production/images/medium/am-2014-03367f_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am503367f'>ACS Electronic Supporting Info</A></P>
YoungJong Kim,JinKyung Park,WonSub Kang,SuKang Kim,Changsu Han,HaeRi Na,HaeJeong Park,JongWoo Kim,YoungYoul Kim,MoonHo Park,JongWoo Paik 대한신경정신의학회 2017 PSYCHIATRY INVESTIGATION Vol.14 No.1
Objective-Mitochondrial dysfunction is a prominent and early feature of Alzheimer’s disease (AD). The morphologic changes observed in the AD brain could be caused by a failure of mitochondrial fusion mechanisms. The aim of this study was to investigate whether genetic polymorphisms of two genes involved in mitochondrial fusion mechanisms, optic atrophy 1 (OPA1) and mitofusin 2 (MFN2), were associated with AD in the Korean population by analyzing genotypes and allele frequencies. Methods-One coding single nucleotide polymorphism (SNP) in the MFN2, rs1042837, and two coding SNPs in the OPA1, rs7624750 and rs9851685, were compared between 165 patients with AD (83 men and 82 women, mean age 72.3±4.41) and 186 healthy control subjects (82 men and 104 women, mean age 76.5±5.98). Results-Among these three SNPs, rs1042837 showed statistically significant differences in allele frequency, and genotype frequency in the co-dominant 1 model and in the dominant model. Conclusion-These results suggest that the rs1042837 polymorphism in MFN2 may be involved in the pathogenesis of AD.
( Min Su Kim ),( Gi Woong Nam ),( Dong Wan Kim ),( Ha Eun Kim ),( Haeri Kang ),( Wook Bin Lee ),( Hyon Kwang Choi ),( Yang Soo Kim ),( Jae Young Leem ) 대한금속재료학회(구 대한금속학회) 2015 대한금속·재료학회지 Vol.53 No.2
ZnO nanorods were hydrothermally grown on R-plane sapphire substrates coated with an as-grown ZnO seed layer and with ZnO seed layers annealed at different temperatures. The effects of the seed-layer annealing temperature on the structural and optical properties of the ZnO nanorods were investigated using scanning electron microscopy, X-ray diffraction, and photoluminescence. ZnO nanorods and nanosheets grew on the as-prepared seed layer. Only ZnO nanorods grew on the ZnO seed layer annealed above 700 ℃. The structural and optical properties of the ZnO nanorods were significantly enhanced when the seed layers were annealed at 700 ℃. A cubic equation was used to establish the non-linear exciton radiative lifetime of the free exciton emission peak. Varshni’s empirical equation fitting parameters were α = 4 × 10.3 eV/K, β = 1 × 104 K, and Eg(0) = 3.335 eV; the activation energy was ~94.6 meV.
Kim, Haeri,Park, Hyun Seo,Hwang, Yun Jeong,Min, Byoung Koun American Chemical Society 2017 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.121 No.41
<P>The electrocatalytic property of a flat or an oxide-derived nanostructure Au electrode was investigated using surface sensitive analysis methods such as impedance spectroscopy and Kelvin probe force microscopy (KPFM) when electrochemical conversion of carbon dioxide (CO2) to carbon monoxide (CO) was performed with either KHCO3- or NaHCO3-based neutral electrolyte. A strong dependence on the cation of the electrolyte was exhibited on the flat Au electrode surface. CO selectivity and capacitance dispersion are significantly higher with the KHCO3 electrolyte. On the other hand, the nanostructured Au electrodes, having much more improved activity and durability of CO2 reduction, showed much less electrolyte-dependent catalytic activity. The difference in CO selectivity with KHCO3 and NaHCO3 electrolytes can be explained by the difference in hydration level and consequent adsorption strength of the cations on the flat Au metal electrodes, implying that ion-pairing interactions between the metal, cations, CO2, and its intermediate play an important role in the reduction reaction. The local electric field fluctuation caused by the nanostructured rough Au surface can affect the electric double layer near the electrode surface and suppress the electrolyte-dependency of the reduction. Furthermore, according to X-ray spectroscopy analysis of the electrode after electrolysis, the nanostructured Au electrode is less prone to surface cation deposition. These results provide a basic understanding of the role of electrolyte cations in the CO2 reduction reaction.</P>
Kim, Haeri,Kim, Dong-Wook,Phark, Soo-Hyon Institute of Physics [etc.] 2010 Journal of Physics. D, Applied Physics Vol.43 No.50
<P>Using Pt/TiO<SUB>2</SUB>/Ti planar junctions fabricated with micrometre-sized gaps between electrodes, we found that the application of a bias voltage between the electrodes significantly decreased the resistance of the junction. The nanoscopic resistance profile revealed that the electrical stress modified the bulk as well as the contact resistance. Electrostatic force microscopy was used to investigate the charge distribution and its time evolution in local areas scanned by positively biased Pt-coated tips. Comparative investigations of the transport and scanning probe microscopy results suggest that the electrical stress induced a redistribution of ions, which then modified the junctions' transport characteristics.</P>