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Photoelectrochemical properties of hematite thin films grown by MW-CBD
Choi, Hayoung,Hong, Yaejin,Ryu, Hyukhyun,Lee, Won-Jae Elsevier 2018 Surface & coatings technology Vol.333 No.-
<P><B>Abstract</B></P> <P>In this study, Fe<SUB>2</SUB>O<SUB>3</SUB> thin films were grown on a Fe<SUB>2</SUB>O<SUB>3</SUB> buffered-film using the microwave chemical bath deposition (MW-CBD) method with different FeCl<SUB>3</SUB> precursor concentrations. The morphological, optical, structural, electrical and photoelectrochemical properties of the Fe<SUB>2</SUB>O<SUB>3</SUB> thin films were studied according to the different precursor concentrations, and the relationships between each property were systematically analyzed. From the study, we found that the morphological, structural and electrical properties greatly influenced the photoelectrochemical properties. As a result, the 0.1M sample, which has good morphological, structural, and electrical properties has the highest photocurrent density value of 0.31mA/cm<SUP>2</SUP> (at 0.5V vs. SCE), and has good photostability properties. Field emission scanning electron microscopy (FE-SEM) and atomic force microscope (AFM) were used to characterize the morphological properties of the Fe<SUB>2</SUB>O<SUB>3</SUB> thin films. X-ray diffraction (XRD) was used to study the structural properties, UV–visible spectroscopy was used to measure the optical properties, electrochemical impedance spectroscope (EIS) was used to characterize the electrical properties and a three-electrode potentiostat was used to measure the photoelectrochemical properties.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The Fe<SUB>2</SUB>O<SUB>3</SUB> photoelectrode was grown by microwave chemical deposition (MW-CBD) method. </LI> <LI> The effects of the FeCl<SUB>3</SUB> concentration on the Fe<SUB>2</SUB>O<SUB>3</SUB> photoelectrode were investigated. </LI> <LI> The properties of Fe<SUB>2</SUB>O<SUB>3</SUB> photoelectrode were largely dependent on the FeCl<SUB>3</SUB> concentration. </LI> <LI> The 0.1 M-sample had the best photoelectrochemical properties. </LI> </UL> </P>
Treatment outcomes of macrolide-susceptible <i>Mycobacterium abscessus</i> lung disease
Choi, Hayoung,Jhun, Byung Woo,Kim, Su-Young,Kim, Dae Hun,Lee, Hyun,Jeon, Kyeongman,Kwon, O Jung,Huh, Hee Jae,Ki, Chang-Seok,Lee, Nam Yong,Shin, Sung Jae,Daley, Charles L.,Koh, Won-Jung Elsevier 2018 Diagnostic microbiology and infectious disease Vol.90 No.4
<P><B>Abstract</B></P> <P> <I>Mycobacterium abscessus</I> lung disease is difficult to treat due to inducible resistance to macrolides. However, 15%–20% of isolates are macrolide susceptible. In 14 patients with macrolide-susceptible <I>M. abscessus</I> lung disease, all isolates had nonfunctional <I>erm</I>(41) gene, and sputum culture conversion rate was achieved in 93% (13/14) following antibiotic therapy.</P> <P><B>Highlights</B></P> <P> <UL> <LI> <I>Mycobacterium abscessus</I> lung disease is difficult to treat due to inducible resistance to macrolides. </LI> <LI> However, 15%–20% of isolates are macrolide susceptible. </LI> <LI> Macrolide-susceptible <I>M. abscessus</I> isolates have nonfunctional <I>erm</I>(41) gene. </LI> <LI> Most macrolide-susceptible <I>M. abscessus</I> lung disease can be successfully treated. </LI> </UL> </P>
Choi, Hayoung,Hong, Yaejin,Ryu, Hyukhyun,Lee, Won-Jae Elsevier 2018 CERAMICS INTERNATIONAL Vol.44 No.4
<P><B>Abstract</B></P> <P>In this study, Fe<SUB>2</SUB>O<SUB>3</SUB> thin films were deposited via one-step and two-step electrochemical deposition methods. The one-step method used a constant growth potential, and the two-step method used two continuous growth potentials during the deposition. The morphological, electrical, and structural properties of the thin films and the relationships of each property with the photoelectrochemical properties of the thin films from the two methods were analyzed and compared. We determined that the samples grown by the two-step method have better photoelectrochemical properties than those grown by the one-step method. In this study, we attempted to determine the optimum growth potentials for the one-step and two-step methods and the growth durations of the first and second stages in the two-step method in terms of the photoelectrochemical properties. The sample formed at −0.05V for 30s in the first step and −0.25V for 2min 30s in the second step in the two-step method has the highest photocurrent density value of 0.28mA/cm<SUP>2</SUP> (at 0.5V vs. SCE), which is higher than that of the samples grown by the one-step method.</P>