• 제목/요약/키워드: X-Ray Spectrometer

검색결과 475건 처리시간 0.031초

Characteristic of Al-In-Sn-ZnO Thin Film Prepared by FTS System with Hetero Targets

  • Hong, Jeong-Soo;Kim, Kyung-Hwan
    • Transactions on Electrical and Electronic Materials
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    • 제12권2호
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    • pp.76-79
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    • 2011
  • In order to improve efficiency and make a new material thin film, we prepared the Al-In-Sn-ZnO thin film on a glass substrate at room temperature using a Facing Target Sputtering (FTS) system. The FTS system was designed to array two targets that face each other. Two different kinds of targets were installed on the FTS system. We used an ITO ($In_2O_3$ 90wt%, $SnO_2$ 10wt%) target and an AZO (ZnO 98wt%, $Al_2O_3$ 2wt%) target. The AIZTO films were deposited using different applied powers to the targets. The as-deposited AIZTO thin films were investigated using a UV/VIS spectrometer, an X-ray diffratometer (XRD), and Energy Dispersive X-ray spectroscopy (EDX).

열화학기상증착법을 이용한 GaN nanowire 합성 (Synthesis of GaN nanowires using thermal chemical vapor deposition)

  • 류승철;이태재;이철진
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2001년도 하계학술대회 논문집
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    • pp.931-934
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    • 2001
  • GaN nanowires has much interest as one-dimensional materials for blue light LED. GaN-based materials have been the subject of intensive research for blue light emission and high temperature/high power electronic devices. In this letter, the synthesis of GaN nanowires by the reaction of mixture of GaN nanowires by the reaction of mixture of Ga meta and GaN powder with NH$_3$ using thermal chemical vapor deposition is reported. X-ray diffraction, energy dispersive x-ray spectrometer, scanning electron microscopy, and transmission electron microscopy indicate that those GaN nanowires with hexagonal wurtzite structure were about 60nm in diameter and up to several hundreds of micrometers in length.

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생물학적 축산분뇨처리시설에서 인 회수의 가능성 평가 (Feasibility of Phosphorus Recovery from Biological Livestock Wastewater Treatment Plant)

  • 안조환;김장호;민성재
    • 한국물환경학회지
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    • 제32권4호
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    • pp.343-348
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    • 2016
  • A chemical sequencing batch reactor was operated to test the feasibility of nutrient recovery from a biological livestock wastewater treatment plant. Both phosphate and ammonia could be successfully recovered as magnesium ammonium phosphate (MAP) crystals. The contents of TP and TN in the recovered MAP crystals were 26.2% and 4.0%, respectively. Zn, Cr and Ti were identified in the crystals, but the contents remained below the Korean standard for an organic fertilizer. Chemical analyses confirmed that the MAP crystals could be useful phosphate fertilizers. On the other hand, the results of physical analyses using an X-ray diffractometer and an energy dispersive X-ray spectrometer strongly suggested that crystalline materials like magnesium potassium phosphate (KMP) and hydroxyapatite (HAP) were also formed during the MAP crystallization, depending on the availability of K+ and Ca2+.

Preparation of multi-component thin film by facing target sputtering system

  • Kim, Kyung-Hwan
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 2010년도 제39회 하계학술대회 초록집
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    • pp.252-252
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    • 2010
  • AIZTO (Al-In-Sn-ZnO) thin film was deposited on glass substrate at room temperature by facing target sputtering (FTS) system. The FTS system was designed to array two targets facing each other. Two different kinds of targets were installed on FTS system. We used the ITO (In2O3 90wt%, SnO2 10wt%) target and the AZO (ZnO 98wt%, Al2O3 2wt%). AIZTO films were deposited in each of the applied power of the targets. The electrical and structural properties of the as-deposited AIZTO thin films were then examined by hall-effect measurement, and by using atomic force microscope (AFM), X-ray diffractometer (XRD), and energy dispersive x-ray spectroscopy (EDX). The optical property was measured by an UV-VIS spectrometer.

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PLD증착 변수에 따른 II-VI족 화합물 ZnO 반도체 박막의 발광 특성 연구 (Correlation Between Deposition Parameters and Photoluminescence of ZnO Semiconducting Thin Films by Pulsed laser Deposition)

  • 배상혁;윤일구;서대식;명재민;이상렬
    • 한국전기전자재료학회논문지
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    • 제14권3호
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    • pp.246-250
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    • 2001
  • ZnO thin films for light emission device have been deposited on sapphire and silicon substrates by pulsed laser deposition technique(PLD). A Nd:YAG laser was used with the wavelength of355 nm. In order to investigate the emission properties of ZnO thin films, Pl measurements with an Ar ion laser a light source using an excitation wavelength of 351 nm and a power of 100 mW are used. All spectra were taken at room temperature by using a grating spectrometer and a photomultiplier detector. ZnO exhibited Pl bands centers around 390, 510 and 640 nm, labeled near ultra-violet(UV), green and orange bands. Structural properties of ZnO thin films are analyzed with X-ray diffraction(XRD).

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Polyol Synthesis of Ruthenium Selenide Catalysts for Oxygen Reduction Reaction

  • Lee, Ki-Rak;Woo, Seong-Ihl
    • Bulletin of the Korean Chemical Society
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    • 제31권11호
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    • pp.3145-3150
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    • 2010
  • Ruthenium catalysts modified by selenium have been introduced as alternative materials to Pt in Direct methanol fuel cells (DMFCs). RuSe nano-particles were synthesized on the Vulcan XC72R carbon supports via polyol method. The prepared catalysts were electrochemically and physically characterized by cyclic voltammetry (CV,) linear sweep voltammetry, methanol tolerance test, X-ray diffraction (XRD), Transmission electron microscopy (TEM), Energydispersive Spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS). Increasing the Se concentration up to 20 at % increased the electro-catalytic activity for the oxygen reduction. By increasing Se amount, Ru metallic form on the surface was increased. The $Ru_{80}Se_{20}$/C catalysts showed the highest oxygen reduction reaction (ORR) activity and outstanding methanol tolerant property in half cell tests as well as single cell test.

펄스 레이저 증착법으로 제작한 ZnO 박막의 발광 특성 (Light emission properties of ZnO thin films grown by pulsed laser deposition)

  • 배상혁;이상렬
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2000년도 추계학술대회 논문집
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    • pp.539-542
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    • 2000
  • ZnO thin films for light emission device have been deposited on sapphire and silicon substrates by pulsed laser deposition technique(PLD). A Nd:YAG laser was used with the wavelength of 355 nm. In order to investigate the emission properties of ZnO thin films, PL measurements with an Ar ion laser as a light source using an excitation wavelength of 351 nm and a power of 100 mW are used. All spectra were taken at room temperature by using a grating spectrometer and a photomultiplier detector. ZnO exhibited PL bands centered around 390, 510 and 640 nm, labeled near ultra-violet (UV), green and orange bands. Structural properties of ZnO thin films are analized with X-ray diffraction (XRD).

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$Al_2O_3$조성변화에 따른 YIG의 주파수 및 자기특성 (The frequency and magnetic characteristics of YIG with the variation of $Al_2O_3$ additions)

  • 홍기원;김명호;장경욱;이준웅
    • E2M - 전기 전자와 첨단 소재
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    • 제8권6호
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    • pp.787-794
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    • 1995
  • To improvement the magnetic and frequency properties of YIG(Yttrium-Iron Garnet) in microwave region, it is investigated that the effect of $Al^{3+}$ ions on magnetic and frequency characteristics of YIG, using samples of basic YIG composition( $Y_{3}$F $e_{5}$ $O_{l2}$) added with A1$_{2}$ $O_{3}$ from 0 to 2.5 [mol%]. The measurment is conducted mainly for the structural properties and magnetical properties. The structural properties is measured using SEM(Scanning Electro Microscope), EDX(Energy-dispersive X-ray spectrometer) and XRD(X-ray diffraction equipment). The magnetical properties is measured with B-H curve tracer and impedance analyzer. As a result, it is confin-ned that the effect of eddy current loss is minimized while maintaining high saturation flux density of YIG, when YIG is added with 0.5 [mol%] of A1$_{2}$ $O_{3}$.>.>.

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페로브스카이형 Ba계열의 미세구조 특성 (A Study on Property of Microstructuree for Ba System of Perovskite Structure)

  • 송민종;동경래;김창복;최성관;박용순
    • 대한디지털의료영상학회논문지
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    • 제13권4호
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    • pp.185-189
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    • 2011
  • To assess the prevalence of various radiological reduction methods for childhood intussusception in training hospitals by means of a nationwide phone survey, and to demonstrate recent trends in this area by comparing the findings with those obtained in a survey conducted. $BaTiO_3$ system was prepared by using fabrication of classical conditioning ceramics. Polycrystalline and surface structure characteristics of the specimens were measured by X-ray diffraction, SEM(Scanning Electron Microscopy) and EDAX (Energy Dispersive Spectrometer), respectively.

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TRACING BRIGHT AND DARK SIDES OF THE UNIVERSE WITH X-RAY OBSERVATIONS

  • SUTO YASUSHI;YOSHIKAWA KOHJI;DOLAG KLAUS;SASAKI SHIN;YAMASAKI NORIKO Y.;OHASHI TAKAYA;MITSUDA KAZUHISA;TAWARA YUZURU;FUJIMOTO RYUICHI;FURUSHO TAE;FURUZAWA AKIHIRO;ISHIDA MANABU;ISHISAKI YOSHITAKA
    • 천문학회지
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    • 제37권5호
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    • pp.387-392
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    • 2004
  • X-ray observations of galaxy clusters have played an important role in cosmology, especially in determining the cosmological density parameter and the fluctuation amplitude. While they represent the bright side of the universe together with the other probes including the cosmic microwave background and the Type Ia supernovae, the resulting information clearly indicates that the universe is dominated by dark components. Even most of cosmic baryons turns out to be dark. In order to elucidate the nature of dark baryons, we propose a dedicated soft-X-ray mission, DIOS (Diffuse Intergalactic Oxygen Surveyor). Recent numerical simulations suggest that approximately 30 to 50 percent of total baryons at z = 0 take the form of the warm-hot intergalactic medium (WHIM) with $10^5K < T < 10^7K $which has evaded the direct detection so far. The unprecedented energy resolution (${\~} 2eV$) of the XSA (X-ray Spectrometer Array) on-board DIGS enables us to identify WHIM with gas temperature $T = 10^6 {\~} 10^7K$ and overdensity $\delta$ = 10 ${\~}$ 100 located at z < 0.3 through emission lines of OVII and OVIII. In addition, WHIMs surrounding nearby clusters are detectable with a typical exposure time of a day, and thus constitute realistic and promising targets for DIOS.