• Effect of annealing temperature on Cu2O thin films prepared by thermal oxidation methodEffect of annealing temperature on Cu2O thin films prepared by thermal oxidation method

    Abstract: We report a facile process to fabricate cuprous thin films by thermal oxidation of copper substrates. Structure and phase identification were studied by X-ray diffraction measurement and Raman spectroscopy. Scanning electron microscopy was utilized to study surface morphology of the as-fabricated thin films and optical properties of th...

    pdf6 trang | Chia sẻ: thanhle95 | Ngày: 13/07/2021 | Lượt xem: 372 | Lượt tải: 0

  • Investigation on structure of TeO2-B2O3-SiO2-Al2O3-KF glassesInvestigation on structure of TeO2-B2O3-SiO2-Al2O3-KF glasses

    1. Introduction In recent decades, there has been an increasing attraction in synthesis and studies of structural and physical properties of heavy metal oxide glasses due to their diversity applications in optical field [1- 3]. Among these glasses, tellurite glasses are technologically and scientifically important due to their outstanding prope...

    pdf8 trang | Chia sẻ: thanhle95 | Ngày: 13/07/2021 | Lượt xem: 433 | Lượt tải: 0

  • Investigation of pressure effect on the structure of 3Al2O3.2SiO2 systemInvestigation of pressure effect on the structure of 3Al2O3.2SiO2 system

    Abstract: This paper studies the structure of the Mullite system (3Al2O3.2SiO2) by Molecular Dynamics simulation (MDs) using the Born–Mayer–Huggins pair interaction and periodic boundary conditions. The simulation was performed with model of 5250 atoms at different pressure and at 3500 K temperature. The structural properties of the system were ...

    pdf7 trang | Chia sẻ: thanhle95 | Ngày: 13/07/2021 | Lượt xem: 389 | Lượt tải: 0

  • Influences of PbS quantum dot layers on power conversion efficiency of single junction GaAs solar cellsInfluences of PbS quantum dot layers on power conversion efficiency of single junction GaAs solar cells

    Abstract: This paper investigates how PbS coating layers influence the characteristics of GaAs single junction solar cells through I-V characteristic measurements, optical reflectance spectra, and quantum efficiencies. To determine the expected influence, PbS quantum dots were coated on the surface of single junction GaAs solar cells by a drop c...

    pdf6 trang | Chia sẻ: thanhle95 | Ngày: 13/07/2021 | Lượt xem: 461 | Lượt tải: 0

  • Optical properties and white light emission of Dy3+doped alumino boro-tellurite glassesOptical properties and white light emission of Dy3+doped alumino boro-tellurite glasses

    Abstract: Dy3+doped alumino boro-tellurite (ABT) glasses xB2O3+(80-x)TeO2+10Al2O3+10CaO+ 0.5Dy2O3 (where x = 35; 45 and 55) have been prepared by melting method. Their optical properties were studied through absorption, luminescence spectra and decay time measurements. Judd-Ofelt (JO) intensity parameters (Ωλ, λ = 2, 4 and 6) were determined usi...

    pdf7 trang | Chia sẻ: thanhle95 | Ngày: 13/07/2021 | Lượt xem: 426 | Lượt tải: 0

  • Improvement of critical current density in Bi-2223 superconductor by Ag-dopingImprovement of critical current density in Bi-2223 superconductor by Ag-doping

    Abstract: In this study, high-Tc superconducting polycrystalline Bi-2223 undoped sample (A0) and 5wt.% Ag-doped sample (A5) were prepared by solid-state reaction method at 8550C with sintering time of 8 days. The X-ray powder diffraction (XRD) results show that the major phase of these samples was Bi-2223. The volume ratio of Bi-2223 phase incre...

    pdf11 trang | Chia sẻ: thanhle95 | Ngày: 13/07/2021 | Lượt xem: 372 | Lượt tải: 0

  • Synthesis and Characterization of Ni2+-Doped SnO2 PowdersSynthesis and Characterization of Ni2+-Doped SnO2 Powders

    Abstract: In this study, SnO2:Ni2+ powders with dopant contents ranging from 0.0 to 12 mol% were synthesized by sol-gel method. The samples were characterized by X-ray diffraction (XRD) Raman spectroscopy, energy-dispersive X-ray spectrometer (EDS) and photoluminescense (PL) spectra. The XRD analysis shows that the samples doped with low Ni- con...

    pdf8 trang | Chia sẻ: thanhle95 | Ngày: 13/07/2021 | Lượt xem: 360 | Lượt tải: 0

  • Semimetal-insulator phase transition in a GaSb/InAs heterostructureSemimetal-insulator phase transition in a GaSb/InAs heterostructure

    Abstract. In this study, the authors will show that a semimetal-insulator phase transition may take place in the GaSb/InAs heterostructures due to the exciton pairing between the electrons and holes in the system. In the heterostructure, the top of the valence band of the InAs layer is higher than the bottom of the conduction band of the GaSb la...

    pdf8 trang | Chia sẻ: thanhle95 | Ngày: 13/07/2021 | Lượt xem: 422 | Lượt tải: 0

  • Simultaneous spectrophotometric determination of Cu(II), Co(II), Ni(II) using 1-(2-pyridylazo)-2- naphthol (PAN) by chemometric methodSimultaneous spectrophotometric determination of Cu(II), Co(II), Ni(II) using 1-(2-pyridylazo)-2- naphthol (PAN) by chemometric method

    Abstract. A spectrophotometric determination of copper(II), cobalt(II) and nickel(II) is carried out using PAN as the complexing reagent in aqueous phase and using surfactant Tween 80 and result in high repeatability. The λmax molar absorption of Cu(II), Co(II) and Ni(II) are 550 nm, 580 nm and 569 nm. The pH value appropriate for complex forma...

    pdf6 trang | Chia sẻ: thanhle95 | Ngày: 13/07/2021 | Lượt xem: 563 | Lượt tải: 0

  • The influence of temperature on microstructure and the phase transition temperatures of Fe particle models under simulated conditionsThe influence of temperature on microstructure and the phase transition temperatures of Fe particle models under simulated conditions

    Abstract. This paper presents the influence of temperature on microstructure and phase transition when heating 3000 nano-iron and bulk-iron particles at a temperature of 300 K, 500 K, 700 K, 900 K, 1100 K, 1300 K, 1500 K, 1700 K, 1900 K and 2100 K using the molecular dynamics (MD) simulation method. The models were applied in the Sutton-Chen em...

    pdf7 trang | Chia sẻ: thanhle95 | Ngày: 13/07/2021 | Lượt xem: 376 | Lượt tải: 0