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Byun, Sejin,Cha, Joonil,Zhou, Chongjian,Lee, Yong Kyu,Lee, Hyungseok,Park, Sang Hyun,Lee, Won Bo,Chung, In Elsevier 2019 Journal of solid state chemistry Vol.269 No.-
<P><B>Abstract</B></P> <P>Bi<SUB>2</SUB>Te<SUB>3</SUB>-based materials are a representative thermoelectric system operating near ambient temperature. Their n-type family is very limited and underperforms the p-type counterpart, which is a major concern in the thermoelectric community. Here we report that alkali earth metals (AE = Mg, Ca, Sr, Ba) in Group 2 unusually induce n-type thermoelectric properties in Bi<SUB>2</SUB>Te<SUB>3</SUB>. Mg is the most efficient electron donor among them. The <I>x</I> = 0.01 sample of Mg<SUB> <I>x</I> </SUB>Bi<SUB>2-<I>x</I> </SUB>Te<SUB>3</SUB> (<I>x</I> = 0.005, 0.01, 0.015) system exhibits remarkably enhanced power factor and <I>ZT</I> of ~0.8 at 350 K in comparison with pristine Bi<SUB>2</SUB>Te<SUB>3</SUB>. The improved performance is attributed to simultaneously enhanced electrical conductivity and reduced lattice thermal conductivity. Remarkably, Mg<SUB> <I>x</I> </SUB>Bi<SUB>2-<I>x</I> </SUB>Te<SUB>3</SUB> materials show larger Seebeck coefficients than those expected by the theoretical Pisarenko relation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Doping divalent alkali earth metals unusually induces n-type conduction in thermoelectric Bi<SUB>2</SUB>Te<SUB>3</SUB>. </LI> <LI> Mg doping (0.5–1.5%) provides extra charge carriers to increase carrier concentration and electrical conductivity. </LI> <LI> n-type Mg<SUB> <I>x</I> </SUB>Bi<SUB>2-<I>x</I> </SUB>Te<SUB>3</SUB> exhibits larger Seebeck coefficients than those expected by the theoretical Pisarenko relation. </LI> <LI> 1% Mg doping simultaneously enhances power factor and suppresses thermal conductivity, giving a high <I>ZT</I> of ~0.8 at 350 K. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>1% Mg doping increases charge carrier concentration and electrical conductivity. As a result, remarkably high power factor near ambient temperature is obtained in n-type Mg<SUB>0.01</SUB>Bi<SUB>1.99</SUB>Te<SUB>3</SUB>. Coupled with reduced lattice thermal conductivity, a high <I>ZT</I> of ~0.8 at 350 K is achieved for n-type Mg<SUB>0.01</SUB>Bi<SUB>1.99</SUB>Te<SUB>3</SUB>.</P> <P>[DISPLAY OMISSION]</P>
( Sejin Byun ),( Seung Min Jung ),( Jason Jungsik Song ),( Yong-beom Park ),( Sang-won Lee ) 대한류마티스학회 2017 대한류마티스학회지 Vol.24 No.3
Objective. We investigated the association of platelet distribution width (PDW) and mean platelet volume (MPV) with disease activity indices of ankylosing spondylitis (AS) in patients whose laboratory results or medical conditions would not affect PDW and MPV levels. Methods. We analysed demographic and laboratory data of 88 patients with AS. On the same day as the laboratory tests were done, we assessed AS disease activity using the Bath Ankylosing Spondylitis Disease Activity Index, Bath Ankylosing Spondylitis Functional Index, Bath Ankylosing Spondylitis Patients Global Score and Ankylosing Spondylitis Disease Activity Score (ASDAS), including erythrocyte sedimentation rate (ESR) (ASDAS-ESR) and C-reactive protein (CRP) (ASDAS-CRP). The association was analyzed by linear regression. Results. The median age of 88 patients was 38.0 years and the median length of observation was 5.5 years. The median platelet count was 266,500.0/μL, the median PDW was 10.7 fL and the median MPV 9.6 fL. The median ESR was 19.0 mm/hr and CRP was 2.5 mg/L. Among acute reactants, only CRP was negatively correlated with MPV, but not PDW (r=-0.218, p<0.041). However, both PDW and MPV were not significantly correlated with any disease activity index of AS. On multivariate linear regression analysis, only the length of observation was significantly correlated with MPV (β=0.224, p<0.044). Conclusion. PDW and MPV were not potent surrogate markers to reflect AS activity, with potential confounding strictly controlled, to affect MPV and PDW levels. (J Rheum Dis 2017;24:143-148)
( Sejin Byun ),( Seung Min Jung ),( Jason Jungsik Song ),( Yong-beom Park ),( Sang-won Lee ) 대한류마티스학회 2018 대한류마티스학회지 Vol.25 No.2
Objective. This study examined whether glycated hemoglobin (HbA1c) and glycated albumin (GA) are well correlated with the Ankylosing Spondylitis Disease Activity Score (ASDAS)-erythrocyte sedimentation rate (ESR), and ASDAS-C-reactive protein (CRP) in AS patients without medical conditions affecting the glycated protein levels. Methods: The data of 76 patients with AS were analyzed. Univariate and multivariate analyses of the variables associated with ASDAS-ESR and ASDAS-CRP were performed using a linear regression test. The patients were divided into active and inactive AS groups based on an ASDAS-CRP of 2.1, and the variables between the two groups were compared. Results. ASDAS-ESR did not correlated with either HbA1c or GA. ASDAS-CRP was positively correlated with HbA1c (r=0.315, p=0.006) and the white blood cell (r=0.288, p=0.012), and inversely correlated with hemoglobin (r=-0.241, p=0.036) and serum albumin (r=-0.262, p=0.022), but not GA. Multivariate analysis revealed HbA1c and white blood cell to be significantly correlated with ASDAS-CRP (β=0.234, p=0.033 and β=0.265, p=0.017). The mean HbA1c, not GA, of the active group was significantly higher than that of the inactive group (p=0.020). In addition, the optimal cut-off value of HbA1c was set to 5.6, and the patients with HbA1c ≥5.6 were found to have a 3.3 times higher risk of active AS than those without. Conclusion. HbA1c was significantly correlated with ASDAS-CRP, and could be a useful marker to reflect ASDAS-CRP in AS patients without medical conditions affecting the glycated protein levels. (J Rheum Dis 2018;25:131-139)
Kim, Sang Hoon,Choi, Jeong Beom,Nguyen, Quynh Nhu,Lee, Joung Min,Park, Sejin,Chung, Taek Dong,Byun, Ji Young The Royal Society of Chemistry 2013 Physical chemistry chemical physics Vol.15 No.16
<P>Nanoporous Pt thin films were prepared by simultaneous deposition of Pt and Si and subsequent dealloying of Si out of the Pt<SUB><I>x</I></SUB>Si<SUB>1−<I>x</I></SUB> films. The <I>x</I> values were easily controlled in the range of 0.10 to 0.90 by the distances between the sample position and the target positions and by the plasma power for the targets. With a roughness factor of around 40, the nanoporous Pt films showed enough sensitivity, selectivity, and detection limit for glucose and interfering species. Multiple nanoporous Pt films with similar roughness factors were easily fabricated using this method, which showed good enough and similar performance to other reported glucose sensors, suggesting a simple and quality controlled manufacturing method for nanoporous Pt films as nonenzymatic glucose sensors.</P> <P>Graphic Abstract</P><P>Amperometric response of nanoporous Pt films to glucose and other interfering species. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cp43097e'> </P>