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2D strain measurement in sub-10 nm SiGe layer with dark-field electron holography
Hoang, V.V.,Cho, Y.J.,Yoo, J.H.,Yang, J.M.,Choi, S.,Jung, W.,Choi, Y.H.,Hong, S.K. Elsevier 2015 CURRENT APPLIED PHYSICS Vol.15 No.11
In this paper, we carried out the two-dimensional (2D) strain measurement in sub-10 nm SiGe layer; images were obtained by dark-field electron holography (DFEH). This technique is based on transmission electron microscopy (TEM), in which dark-field holograms were obtained from a (400) diffraction spot. The measured results were compared to the X-ray diffraction (XRD) results in terms of the strain value and the depth of strain distribution in a very thin SiGe layer. Subsequently, we were able to successfully analyze the 2D strain maps along the [100] growth direction of the nanoscale SiGe region. The strain was measured and found to be in the range of 1.8-2.4%. The strain precision was estimated at 2.5 x 10<SUP>-3</SUP>. As a result, the DFEH technique is truly useful for measuring 2D strain maps in very thin SiGe layers with nanometer resolution and high precision.
Validation and application of HPLC-ESI-MS/MS method for the determination of irsogladine
Hoang, N. H.,Huong, N. L.,Hong, S.-Y.,Park, Je Won Akademiai Kiado Zrt. 2017 Acta chromatographica Vol.29 No.4
<P>A highly sensitive analytical tool for the fast quantification of irsogladine in human plasma was developed. Cleanup using a solid-phase extraction technique is a simple method for extracting both irsogladine and lamotrigine (internal standard) spiked into human plasma. The resolvable separation of both analytes through reversed-phase high-performance liquid chromatography (HPLC) was carried out within 5 min. The HPLC-electrospray ionization (ESI)-tandem mass spectrometry (MS/MS) method, which was operated in a selected reaction monitoring mode specific to the target analytes, was verified for use in the quantification of irsogladine. The inter-and intra-day precision (relative standard deviation, RSD) of irsogladine spiked into quality control samples were <7%, and their accuracies were between 96.6% and 102.1%. The calibration curve for irsogladine spiked into human plasma was linear over the range from 1.8 to 100 ng mL(-1) with lower limit of quantification at 1.8 ng mL(-1). The established method was successfully applied for a bioequivalence study of irsogladine.</P>
Hydroxyapatite Nano-Rods/Chitosan Modified Glassy Carbon Electrode for Cu(II) Ions Determination
Hoang V. Tran,Chinh D. Huynh,Thu D. Le,Hong S. Hoang 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.4
In this work, we propose a simple approach for fabrication of an electrochemical sensor for copper (II) ion determination in aqueous solution based on using a hydroxyapatite nano-rods/chitosan (HA/CS) nanocomposite coated on glassy carbon electrode (GCE) surface. Firstly, hydroxyapatite (HA) nano-rods has been synthesized by a simple precipitation reactions using Ca(OH)2 slurry and orthophosphoric acid (H3PO4) as precursors. After that, as-synthesized HA was dispersed into chitosan (CS) matrix to HA/CS-modify GCE by a drop casting technique. Characteristic of HA and HA/CS coating on GCE have been analysed by Transmission/Scanning Electron Microscope (TEM/SEM), X-ray Diffraction (XRD) and Fourier-Transform infrared spectroscopy (FT-IR) techniques. Electrochemical activities of neat GCE, CS-modified GCEs (GCE/CS) and HA/CS-modified GCE (GCE/HA/CS) have been evaluated in sodium acetate (NaAc-HAc) buffer with presence/absence of Ni2+, Co2+ or Cu2+ ions to test whether sensitive and selective of these developed Cu2+ sensors. Evaluated results demonstrated that GCE/HA/CS sensor has a sensitivity to Cu2+ ion of 7.688 ± 0.5324 µA mM− 1, it is the most sensitive to Cu2+ ions compared with GCE or GCE/CS. In additional, proposed Cu2+ electrochemical sensor has been applied to determine Cu2+ ions concentration in tap water with a high recoveries was found.
T. Thuy Hoang,Minkyu Park,Do Duc Cuong,S. H. Rhim,S. C. Hong 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
Recently, a combined experimental and theoretical study has shown that anomalous Hall conductivity (AHC) can be tailored via tuning Berry curvature regardless of magnetization, which may pave a new way to achieve large AHC without net magnetic moment. For instance, non-negligible AHC of 330(133) Ω<SUP>-1</SUP>cm<SUP>-1</SUP> and 300 Ω<SUP>-1</SUP>cm<SUP>-1</SUP> were predicted in non-collinear antiferromagnetic and compensated ferrimagnetic Heusler compounds Mn₃Ge (Sn) and Ti₂MnAl. In this work, using the PAW and FLAPW methods implemented in VASP and Fleur codes, AHC of a ferrimagnet quaternary Heusler compounds TiZrMnAl (F43m) is studied. Among three possible structural phases (Fig. 1), α-phase is energetically most stable, by energy differences of 0.34 eV/fu and 0.03 eV/fu compared to β- and γ-phase. The local magnetic moment of Mn is antialigned with those of Ti and Zr. As a result, total magnetic moment is fully compensated (mt = 0.0 μB) in α- and β-phase, and nearly compensated (mt = 0.1 μB) in γ-phase. Interestingly, α-phase possesses a large AHC of 1470 Ω<SUP>-1</SUP>cm<SUP>-1</SUP>, while β- and γ-phase show moderate AHC of 200 and 100 Ω<SUP>-1</SUP>cm<SUP>-1</SUP>, consistently in both the PAW and FLAPW methods. The large AHC in α-phase stems from the direct gapless band along the symmetry line LM, which shows a gigantic Berry curvature and nontrivial topology with non-zero Chern number x = ±1. 〈그림 본문참조〉