• Title/Summary/Keyword: energy-dispersive x-ray spectroscopy (eds)

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The Analysis of CdS and CdTe Thin Film at the Processes of Manufacturing CdTe Solar Cells (CdTe 태양전지 제조 공정에 따라 변화하는 CdS와 CdTe 박막의 물성 변화 분석)

  • Chun, Seungju;Jung, Younghun;Choi, Suyoung;Tark, Sung Ju;Kim, Jihyun;Kim, Donghwan
    • 한국신재생에너지학회:학술대회논문집
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    • 2011.05a
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    • pp.106.2-106.2
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    • 2011
  • 다층 박막 구조로 이루어진 CdS/CdTe 태양전지의 경우, 각각의 박막이 다양한 제조 공정을 거치면서 물성특성의 변화를 겪게 된다. 각각의 박막이 고온의 열처리 공정과, $CdCl_2$ 용액 처리 및 후면 산화막 제거 공정 등을 거치게 되면서 겪게 되는 물성 변화 분석을 살펴보고자 한다. 각각의 박막 제조 방식은 일반적으로 사용되는 방식으로, CdS의 경우는 용액성장법(Chemical Bath Deposition, CBD), CdTe의 경우는 근접승화법(Closed Space Sublimaition, CSS)을 사용했으며, X-Ray Diffractometer (XRD), Raman spectroscopy, Field Emission Scanning Electron Microscope (FE-SEM), Energy Dispersive Spectroscopy (EDS), X-ray Photoelectron Spectroscopy (XPS) 등을 이용하여 분석하였다. 각각의 셀 제조 공정을 거치면서 CdS, CdTe 박막들은 결정, 광 특성, 성분 변화를 보였다.

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Insights into the corrosion inhibition of steel rebar in chloride-contaminated synthetic concrete pore solutions by a new hydrazone (새로운 히드라존에 의한 염화물 오염 합성 콘크리트 공극 솔루션에서 철근의 부식 억제에 대한 통찰력)

  • Lgaz, Hassane;Lee, Han-seung
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2022.04a
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    • pp.101-102
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    • 2022
  • A new hydrazone derivatives namely (E)-N'-(4-(dimethylamino)benzylidene)-2-(5-methoxy-2-methyl-1H-indol-3-yl)acetohydrazide (HIND) has been confirmed for mitigating the corrosion of the steel rebar exposed to chloride contaminated synthetic concrete pore solution (ClSCPS). The mitigation of corrosion properties has been characterized by weight loss and electrochemical methods (Electrochemical impedance, Potentiodynamic polarization studies) as well as surface observations. The presence of HIND in the ClSCPS decreased the corrosion of steel rebar by adsorption of HIND molecules on the surface of the steel rebar. The optimal HIND concentration was 0.5 mmol/L, corresponding to an inhibition efficiency of 88.4%. The use of HIND enables the corrosion process to have a higher energy barrier. X-ray photo electron spectroscopy (XPS), atomic force microscopy (AFM), scanning electron microscopy-energy-dispersive spectroscopy (SEM-EDS), and X-ray diffraction (XRD) spectroscopy interpretations confirmed that HIND mitigates the corrosion attack on the surface steel rebar.

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Synthesis of Pt-Sn/Carbon Electrodes by Reduction Method for Direct Methanol Fuel Cell (환원법에 의한 직접 메탄올 연료전지(DMFC)용 Pt-Sn/Carbon 전극제조)

  • Jung, So-Mi;Shin, Ju-Kyung;Kim, Kwan-Sung;Baeck, Sung-Hyeon;Tak, Yong-Sug
    • Applied Chemistry for Engineering
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    • v.21 no.5
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    • pp.537-541
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    • 2010
  • Pt-Sn with various ratios was supported on carbon black after pretreatment in an acidic solution by a reduction method. The Pt/Sn ratio was controlled by varying the concentration of each component in the solution, and the influence of the composition on the electrocatalytic activities was investigated. The crystallinity of the synthesized materials was investigated by XRD (X-ray Diffraction), and the oxidation states of both the platinum and tin were determined by XPS (X-ray Photoelectron Spectroscopy). SEM (Scanning Electron Microscopy)-EDS (Energy Dispersive Spectroscopy) was utilized to examine the morphology and composition of the synthesized electrode, and the particle size of the Pt-Sn was analyzed by TEM (Transmission Electron Microscopy). The electrocatalytic activity for oxygen reduction was evaluated in a 0.5 M $H_2SO_4$ solution using a rotating disk electrode system. The activity and stability were found to be strongly dependent on the electrode composition (Pt/Sn ratio). The catalytic activity and stability for methanol oxidation were also measured using cyclic voltammetry (CV) in a mixture of 0.5 M $H_2SO_4$ and 0.5 M $CH_3OH$ aqueous solution. The addition of proper amount of Sn was found to significantly improve both catalytic activity and stability for methanol oxidation.

Microstructures and Electrochemical Properties of Si-M (M : Cr, Ni) as Alloy Anode for Li Secondary Batteries (리튬이차전지용 Si-M (M : Cr, Ni) 합금 음극의 미세구조와 전기화학적 특성)

  • Lee, Sung-Hyun;Sung, Jewook;Kim, Sung-Soo
    • Journal of the Korean Electrochemical Society
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    • v.18 no.2
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    • pp.68-74
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    • 2015
  • To compare the microstructure and electrochemical properties between two binary alloys (Cr-Si, Ni-Si), two composition of binary alloys with the same capacity were selected using phase-diagram and prepared by matrix-stabilization method to suppress the volume expansion of Si by inactive-matrix. Master alloys were made by Arc-melting followed by fine structured ribbon sample preparation by Rapid Solidification Process (RSP, Melt-spinning method) under the same conditions. Also powder samples were produced by wet grinding for X-Ray Diffraction (XRD) and electrochemical measurements. As predicted from the phase diagram, only active-Si and inactive-matrix ($CrSi_2$, $NiSi_2$) were detected. The results of Scanning Electron Microscope (SEM) and Transmission Electron Microscopy - Energy Dispersive X-ray Spectroscopy (TEM-EDS) show that Cr-Si alloy has finer microstructure than Ni-Si alloy, which was also predictable through phase diagram. The electrochemical properties related to microstructure were evaluated by coin type full- and half-cells. Separately, self-designed test-cells were used to measure the volume expansion of Si during reaction. Volume expansion of Cr-Si alloy electrode with finer microstructure was suppressed significantly and improved in cycle capability, in comparison Ni-Si alloy with coarse microstructure. From these, we could infer the correlation of microstructure, volume expansion and electrochemical degradation and these properties might be predicted by phase diagram.

Study on the Annealing Effect and Magnetic Properties of a Zn0.7Mn0.3O Film (열처리 효과에 따른 Zn0.7Mn0.3O박막의 자기 특성 연구)

  • Kim, Y.M.;Kim, Y.;Yoon, M.;Park, C.S.;Lee, Y.S.;Jeon, M.S.;Park, I.W.;Park, Y.J.;Lyou, Jong H.;Kim, S.S.
    • Journal of the Korean Magnetics Society
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    • v.13 no.4
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    • pp.155-159
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    • 2003
  • We report on the annealing effect and ferromagnetic characteristics of Zn$_{0.7}$Mn$_{0.3}$O film prepared by sol-gel method on the silicon (100) substrate using field emission-scanning electron microscopy (FE-SEM), energy dispersive spectroscopy (EDS), X-ray diffractometry (XRD) and superconducting quantum interference device (SQUID) magnetometry. Magnetic measurements show thatZn$_{0.7}$Mn$_{0.3}$O films exhibit ferromagnetism at 5 K revealing the coercive field of ∼110 Oe for as grown sample and 360, 1035 Oe for samples annealed at 700, 800 $^{\circ}C$, respectively. Our experimental evidence suggests that ferromagnetic precipitates of a manganese oxide may be responsible for the observed ferromagnetic behaviors of the film.he film.

Electrochemical Behavior and Biocompatibility of Co-Cr Dental Alloys

  • Kang, Jung-In;Yoon, Jun-Bin;Choe, Han-Cheol
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2015.05a
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    • pp.107-107
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    • 2015
  • In order to investigate electrochemical behavior and biocompatibility of Co-Cr dental alloy by electrochemical corrosion test and MTT assay, the xCo-25Cr-yW-zNi alloys were used in this study. Samples of Co-Cr-W-Ni alloys were manufactured using arc melting furnace. The microstructure of the alloys was examined by optical microscopy (OM), Field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), MTT assay, and corrosion test. Corrosion resistance increased slightly as cobalt (Co) content increased. And bioactivity was concerned with nickel (Ni) and tungsten (W). Biocompatibility of Co-Cr alloy depended on Ni and W contents.

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Microscopic Analysis of High Lithium-Ion Conducting Glass-Ceramic Sulfides

  • Park, Mansoo;Jung, Wo Dum;Choi, Sungjun;Son, Kihyun;Jung, Hun-Gi;Kim, Byung-Kook;Lee, Hae-Weon;Lee, Jong-Ho;Kim, Hyoungchul
    • Journal of the Korean Ceramic Society
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    • v.53 no.5
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    • pp.568-573
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    • 2016
  • We explore the crystalline structure and phase transition of lithium thiophosphate ($Li_7P_3S_{11}$) solid electrolyte using electron microscopy and X-ray diffraction. The glass-like $Li_7P_3S_{11}$ powder is prepared by the high-energy mechanical milling process. According to the energy dispersive X-ray spectroscopy (EDS) and selected area diffraction (SAD) analysis, the glass powder shows chemical homogeneity without noticeable contrast variation at any specific spot in the specimen and amorphous SAD ring patterns. Upon heating up to $260^{\circ}C$ the glass $Li_7P_3S_{11}$ powder becomes crystallized, clearly representing crystal plane diffraction contrast in the high-resolution transmission electron microscopy image. We further confirm that each diffraction spot precisely corresponds to the diffraction from a particular $Li_7P_3S_{11}$ crystallographic structure, which is also in good agreement with the previous X-ray diffraction results. We expect that the microscopic analysis with EDS and SAD patterns would permit a new approach to study in the atomic scale of other lithium ion conducting sulfides.

CORROSION BEHAVIOR OF AUSTENITIC AND FERRITIC STEELS IN SUPERCRITICAL WATER

  • Luo, Xin;Tang, Rui;Long, Chongsheng;Miao, Zhi;Peng, Qian;Li, Cong
    • Nuclear Engineering and Technology
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    • v.40 no.2
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    • pp.147-154
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    • 2008
  • The general corrosion behavior of austenitic and ferritic steels(316L, 304, N controlled 304L, and 410) in supercritical water is investigated in this paper. After exposure to deaerated supercritical water at $480^{\circ}C$/25 MPa for up to 500 h, the four steels studied were characterized using gravimetry, scanning electron microscopy/energy dispersive X-ray spectroscopy(SEM/EDS), X-ray photoelectron spectroscopy(XPS), and X-ray diffraction(XRD). The results show that the 316L steel with a higher Cr and Ni content has the best corrosion-resistance performance among the steels tested. In addition to the oxide layer mixed with $Fe_{3}O_{4}$ and $(Fe,Cr)_{3}O_{4}$ that formed on all the samples, a $Fe_{3}O_{4}$ loose outer layer was observed on the 410 steel. The corrosion mechanism of stainless steels in supercritical water is discussed based on the above results.

Synthesis of Cobalt-Iron Prussian Blue Analogues Nanotubes by CTAB Soft-Template Method

  • Liu, Peng;Liang, Chuanghui;Xu, Jianfeng;Fang, Jian;Zhao, Jihua;Shen, Weiguo
    • Bulletin of the Korean Chemical Society
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    • v.31 no.5
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    • pp.1336-1338
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    • 2010
  • Three cobalt-iron Prussian Blue Analogues (PBAs) nanotubes contained with different alkali metal cations of K, Rb or Cs, respectively, were prepared by using cetyltrimethylammonium bromide (CTAB)/ethanol-water micelles as soft templates. The products were characterized by energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron micrograph (SEM), which confirmed the composition of the substances and their unique nanotube structures. Furthermore, the formation mechanism of the PBAs nanotubes was discussed and provided useful insight for further synthesis of nanotubes of other Prussian blue analogues.

Ion release and Biocompatibility of Ti-6Al-4V Alloys for Dental application

  • Kang, Jung-In;Son, Mee-Kyoung;Choe, Han-Cheol
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2015.11a
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    • pp.303-303
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    • 2015
  • In order to investigate ion release and biocompatibility of Ti-6Al-4V dental alloy by electrochemical corrosion test and MTT assay, commercial Ti-6Al-4V alloy rod (99.99% Ti, USA, Co) were used in the study. The microstructure of the alloys was examined by optical microscopy (OM), Field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), MTT assay, and corrosion test. From the polarization curves, very low current densities were obtained for Ti-6Al-4V alloys, indicating a formation of stable passive layer.

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