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Photoelectrochemical Deposition of CdZnSe Thin Films on the Se-Modified Au Electrode
Sunyoung Ham,명노승,이웅기,팽기정,Soyeon Jeon 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.5
Photoelectrochemical deposition of CdZnSe thin films on the Se-modified Au electrode using electrochemical quartz crystal microgravimetry (EQCM) and voltammetry is described. Corrosion of pre-deposited Se electrodes by illumination at a fixed potential resulted in Se²- species, which was manifest from the EQCM frequency changes. Se²- species generated from the photocorrosion reacted with Cd²+ and Zn²+ ions in the electrolyte to form CdZnSe films on the Au electrode. The effect of electrolyte composition on the composition and band gap of CdZnSe films was studied in detail. Also, photoelectrochemistry, EDX, Raman spectroscopy were used for the characterization of CdZnSe thin films.
TP53 gain-of-function mutation promotes inflammation in glioblastoma
Ham, Seok Won,Jeon, Hee-Young,Jin, Xiong,Kim, Eun-Jung,Kim, Jun-Kyum,Shin, Yong Jae,Lee, Yeri,Kim, Se Hoon,Lee, Seon Yong,Seo, Sunyoung,Park, Min Gi,Kim, Hye-Mi,Nam, Do-Hyun,Kim, Hyunggee Nature Publishing Group 2019 Cell death and differentiation Vol.26 No.3
Han, Kyu-Man,Choi, Sunyoung,Kim, Aram,Kang, June,Won, Eunsoo,Tae, Woo-Suk,Kim, Yong-Ku,Lee, Min-Soo,Ham, Byung-Joo Elsevier 2018 Psychiatry research, Neuroimaging Vol.273 No.-
<P><B>Abstract</B></P> <P>The serotonin-transporter-linked polymorphic region (<I>5-HTTLPR</I>) and brain-derived neurotrophic factor (<I>BDNF</I>) <I>Val66Met</I> polymorphism have been implicated in the pathophysiology of major depressive disorder (MDD). We aimed to investigate the effects of genetic variants of the <I>5-HTTLPR</I> and <I>BDNF Val66Met</I> polymorphisms and their interactions with MDD on cortical volume and white matter integrity. Ninety-five patients with MDD and 65 healthy participants aged 20–65 years were recruited. The subjects were genotyped for the <I>5-HTTLPR</I> and <I>BDNF Val66Met</I> polymorphisms and scanned with T1-weighted and diffusion tensor imaging. The gray matter volumes of 24 gyri in the prefrontal and anterior cingulate cortices and the fractional anisotropy values of nine white matter tracts in both hemispheres were determined. In the pooled sample of subjects from both groups, <I>5-HTTLPR</I> L-allele carriers had significantly decreased cortical volume in the right anterior midcingulate gyrus compared to S-allele homozygotes. A significant effect of the interaction of the <I>BDNF Val66Met</I> polymorphism and MDD on the fractional anisotropy values of the right uncinate fasciculus was observed. Our results suggested that these genetic polymorphisms play important roles in the neurostructural changes of emotion-processing regions in subjects with MDD.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 95 patients with major depressive disorder (MDD) and 65 controls recruited. </LI> <LI> Subjects genotyped for <I>5-HTTLPR</I> and <I>BDNF Val66</I>Met polymorphism. </LI> <LI> <I>5-HTTLPR</I> associated with volume of right anterior midcingulate gyrus. </LI> <LI> Interactive effect of <I>BDNF Val66Met</I> and MDD on right uncinate fasciculus integrity. </LI> <LI> Interactive effect of both genotypes on left transverse frontopolar gyrus volume. </LI> </UL> </P>
Kim, Sungjoon,Lee, Sunyoung,Ham, So-Yeon,Ko, Dong-Hyun,Shin, Seokhee,Jin, Zhenyu,Min, Yo-Sep Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.469 No.-
<P><B>Abstract</B></P> <P>We present a kinetic model for the reaction of diethylzinc (DEZ) adsorption in atomic layer deposition (ALD) of ZnO from DEZ and water. The proposed model has been verified by comparing kinetic experimental data to the prediction of the model in the temperature range of 60–200 °C. In this model, DEZ molecules are molecularly adsorbed on the hydroxyl-terminated surface in the first elementary reaction. Then the molecularly-adsorbed DEZs either desorb from the surface, or undergo an irreversible ligand exchange reaction and form monoethylzinc (MEZ)-terminated surface by liberating ethane molecules. According to the integrated rate law of the model, as the exposure time of DEZ increases, the growth per cycle ( gpc ) of ALD, i.e., the thickness increment per cycle, rapidly increases and then saturates showing the self-limiting growth behavior. The required DEZ exposure time to reach the saturated gpc value is shortened when the chemical equilibrium between the molecular adsorption and desorption shifts toward the adsorption, as this leads to higher effective rate constant in the overall mechanism of the DEZ adsorption. Although the saturated gpc value is primarily governed by the hydroxyl concentration on the ZnO surface, it is also heavily influenced by the steric hindrance due to the bulkiness of the ethyl ligands. We have determined that the critical temperature at which the steric hindrance disappears is around 150–200 °C, by investigating the variation of the hydroxyl concentration with temperature. At temperatures lower than 150 °C, we have observed that the saturated gpc value is governed by the steric hindrance rather than the hydroxyl concentration. However, the saturated gpc value at 200 °C has been achieved purely by the hydroxyl concentration. In other words, all hydroxyl groups at 200 °C have been consumed and saturated by the MEZ molecules of which the steric hindrance-free concentration has been evaluated to be ∼7.1 /nm<SUP>2</SUP>. In addition, the effective activation energy was estimated to be ∼8.50 kJ/mol by using the effective rate constants of all temperatures investigated.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Governing factors of growth per cycle ( gpc ) were identified depending on growth temperature. </LI> <LI> The saturated gpc values at T < 150 °C are governed by steric hindrance. </LI> <LI> Above 200 °C, the saturated gpc values are decided by surface hydroxyl concentration. </LI> <LI> Effective activation energy of the DEZ adsorption was found to be ∼8.50 kJ/mol. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Steric hindrance of diethylzinc adsorption disappears at 150–200 °C.</P> <P>[DISPLAY OMISSION]</P>