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Suhun Lee,Hyukhyun Ryu,Won-Jae Lee,Jong Seong Bae 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
An Al2O3 capping layer was grown on a CuO photoelectrode using microwave-chemical bath deposition. We investigated the effects of the concentration of the Al2O3 precursor solution on the morphological,structural, optical, electrical and photoelectrochemical properties of the Al2O3/CuO heterostructurephotoelectrode. XPS analysis confirmed that the CuO was structurally stabilized by the Al2O3 cappinglayer. In addition, we found that the morphology, (020) XRD peak intensity, (020) XRD peak full width athalf maximum, optical energy band gap,flat-band potential and acceptor density values of the Al2O3/CuOheterostructure photoelectrode were strongly dependent on the concentration of the Al2O3 precursorsolution. Among the photoelectrodes evaluated in this study, the Al2O3/CuO heterostructurephotoelectrode obtained with an Al2O3 precursor concentration of 3 mM had the highest crystallinity,flat-band potential and acceptor density. It also exhibited a photocurrent density of -2.64 mA/cm2 (vs. SCEat0.55 V) and a photostability of approximately 55%. In contrast, bare CuO had a photocurrent densityof1.8 mA/cm2 (vs. SCE at0.55 V) and a photostability of 25%. Based on our results, the photocurrentdensity and photostability of the CuO photoelectrode could be dramatically improved by capping with anAl2O3 layer using a 3 mM precursor concentration.
Lee, Sun Hee,Ju, Hyun Mi,Choi, Jin Sil,Ahn, Yeji,Lee, Suhun,Seo, Young Joon MDPI 2018 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.19 No.9
<P>Background: To confirm levels and detection timing of circulating microRNAs (miRNAs) in the serum of a mouse model for diagnosis of ototoxicity, circulating miR-205 in the serum was evaluated to reflect damages in the cochlear microstructure and compared to a kidney injury model. Method: A microarray for miRNAs in the serum was performed to assess the ototoxic effects of kanamycin-furosemide. Changes in the levels for the selected miRNAs (miR-205, miR-183, and miR-103) were compared in the serum and microstructures of the cochlea (stria vascularis, organ of Corti, and modiolus) between the ototoxicity and normal mouse groups. An acute kidney injury (AKI) mouse model was used to assess changes in miR-205 levels in the kidney by ototoxic drugs. Results: In the mouse model for ototoxicity, the serum levels of circulating miR-205 peaked on day 3 and were sustained from days 7–14. Furthermore, miR-205 expression was highly expressed in the organ of Corti at day 5, continued to be expressed in the modiolus at high levels until day 14, and was finally also in the stria vascularis. The serum miR-205 in the AKI mice did not change significantly compared to the normal group. Conclusions Circulating miR-205 from the cochlea, after ototoxic damage, migrates through the blood vessels to organs, which is then finally found in blood. In conditions of hearing impairment with ototoxic medications, detection of circulating miR-205 in the blood can be used to determine the extent of hearing loss. In the future, inner ear damage can be identified by simply performing a blood test before the hearing impairment due to ototoxic drugs.</P>
Lee, Suhun,Ryu, Hyukhyun,Lee, Won-Jae,Bae, Jong-Seong Elsevier 2018 Surface & coatings technology Vol.334 No.-
<P><B>Abstract</B></P> <P>In this study, CuO was grown on fluorine-doped tin oxide (FTO) substrates by depositing a copper (II) oxide seed layer via microwave chemical bath deposition while controlling the ammonia concentration. The morphological, optical, structural, electrical, and photoelectrochemical properties were measured by field emission scanning electron microscopy (FE-SEM), UV–vis spectroscopy (UV–vis), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS), and three-electrode potentiostat measurements, respectively. The ammonia concentration affected the morphological and structural properties (i.e., the growth and thickness of the CuO nanostructures), the optical properties (i.e., optical energy bandgap), the electrical properties (i.e., the flat-band potential and acceptor density) and the photoelectrochemical properties of the prepared CuO samples. As a result, the highest photocurrent density of 2.05mA/cm<SUP>2</SUP> (at −0.55V vs. SCE) was obtained for the sample with an ammonia concentration of 0.16M.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Copper(II) oxide nanostructures were grown on FTO substrates via a microwave chemical bath deposition method. </LI> <LI> The effects of ammonia concentration on the morphological, optical, and structural properties of CuO were analyzed. </LI> <LI> The photoelectrochemical properties of CuO were dependent on the thickness, flat-band potential, acceptor density. </LI> <LI> The highest photocurrent density of 2.05mA/cm<SUP>2</SUP> was obtained for the sample with an ammonia concentration of 0.16M. </LI> </UL> </P>