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Physica. B, Condensed matter 54건

  1. [해외논문]   Editorial Board   SCI SCIE


    Physica. B, Condensed matter v.537 ,pp. ii - ii , 2018 , 0921-4526 ,

    초록

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  2. [해외논문]   The adsorption and dissociation of oxygen on Ag (111) supported χ3 borophene   SCI SCIE

    Luo, W.W. (Corresponding author. ) , Liu, G. (Corresponding author.) , Wang, X. , Lei, X.L. , Ouyang, C.Y. , Liu, S.Q.
    Physica. B, Condensed matter v.537 ,pp. 1 - 6 , 2018 , 0921-4526 ,

    초록

    Abstract The superstructure of χ 3 borophene on Ag (111) has recently been synthesized in experiment. In this work, we investigate its structural, electronic properties and the oxidation mechanism through first-principles calculations. We find the superstructure of χ 3 borophene on Ag (111) maintain the planar characteristics, like its free-standing form, owing to the weakly interaction between adsorbate and substrate. Moreover, oxygen molecule can be spontaneously adsorbed on its superstructure in a manner of chemical adsorption. Importantly, the energy barrier of ∼0.35 eV for oxygen dissociation indicates its relative stability in ambient conditions compared with the active silicene. Furthermore, the mobility of O 2 -dissociation-induced O atom is poor at room temperature, implying the difficult migration of O atom on borophene surface. On the other hand, due to the strong BO bonding, desorption of O 2 -dissociation-induced O atoms on superstructure of χ 3 borophene becomes impossible, ultimately leading to form the boron oxides. Highlights The adsorption and dissociation behavior of oxygen molecule on Ag (111) supported χ 3 borophene sheets are revealed. The stability of Ag (111) supported χ 3 borophene is found to be partly in accordance with experimental results. The migration of O atom on Ag (111) supported χ 3 borophene is discussed.

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  3. [해외논문]   On the growth of CH3NH3PbI3-xClx single crystal and characterization   SCI SCIE

    Su, J. (Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, Nanjing University of Information Science & Technology, Nanjing 210044, China ) , Wang, W.F. (Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, Nanjing University of Information Science & Technology, Nanjing 210044, China ) , Lei, Y. (Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, Nanjing University of Information Science & Technology, Nanjing 210044, China ) , Zhang, L. (Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, Nanjing University of Information Science & Technology, Nanjing 210044, China ) , Xu, L.H. (Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, Nanjing University of Information Science & Technology, Nanjing 210044, China ) , Wang, D. (School of Materials Science & Engineering, Tianjin University of Technology, Tianjin 300384, China ) , Lu, D. (Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, Nanjing University of Information Sci) , Bai, Y.
    Physica. B, Condensed matter v.537 ,pp. 7 - 11 , 2018 , 0921-4526 ,

    초록

    Abstract In this paper, CH 3 NH 3 PbI 3-x Cl x crystal was grown by solution cooling method with CH 3 NH 3 I and PbCl 2 as raw materials. Lead compounds and CH 3 NH 3 PbI 3-x Cl x crystal with size about 6 mm × 4 mm × 2 mm were obtained. The chemical reactions with different CH 3 NH 3 I/PbCl 2 ratios were analyzed. XPS shows the content of chlorine in CH 3 NH 3 PbI 3-x Cl x is about 0.91%. PXRD, FT-IR, Raman and absorbance spectra were used to study the structure and optical properties of CH 3 NH 3 PbI 3-x Cl x by comparing with CH 3 NH 3 PbI 3 crystal. The CH 3 NH 3 PbI 3-x Cl x crystal grown is of tetragonal structure with the lattice constants a = b = 8.8165 A, c = 12.7920 A and the bandgap value of 1.57 eV. Highlights Products obtained by solution method with different CH 3 NH 3 I/PbCl 2 ratios were investigated. CH 3 NH 3 PbI 3−x Cl x crystal was grown by solution cooling method successfully. The structure and optical properties of CH 3 NH 3 PbI 3−x Cl x were studied.

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  4. [해외논문]   Melting point of high-purity germanium stable isotopes   SCI SCIE

    Gavva, V.А. (Corresponding author.) , Bulanov, А.D. , Kut'in, А.М. , Plekhovich, А.D. , Churbanov, М.F.
    Physica. B, Condensed matter v.537 ,pp. 12 - 14 , 2018 , 0921-4526 ,

    초록

    Abstract The melting point (T m ) of germanium stable isotopes 72 Ge, 73 Ge, 74 Ge, 76 Ge was determined by differential scanning calorimetry. With the increase in atomic mass of isotope the decrease in T m is observed. The decrease was equal to 0.15 °C per the unit of atomic mass which qualitatively agrees with the value calculated by Lindemann formula accounting for the effect of “isotopic compression” of elementary cell.

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  5. [해외논문]   Metastability in the formation of Condon domains   SCI SCIE

    Bakaleinikov, L.A. (A. F. Ioffe Physico-Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russia ) , Gordon, A. (Department of Exact Sciences, Faculty of Natural Sciences, University of Haifa, Campus Oranim, Tivon, 36006, Israel)
    Physica. B, Condensed matter v.537 ,pp. 15 - 17 , 2018 , 0921-4526 ,

    초록

    Abstract Metastability effects in the formation of Condon non-spin magnetic domains are considered. A possibility for the first-order phase transition occurrence in a three-dimensional electron gas is described in the case of two-frequency de-Haas-van Alphen magnetization oscillations originating from two extremal cross sections of the Fermi surface. The appearance of two additional domains is shown in the metastable region in aluminum. The phase diagram temperature-magnetic field exhibits the presence of second-order and first- order phase transitions in the two-frequency case. Highlights Metastable formation of Condon domains is considered. Existence of temperature first-order diamagnetic phase transitions is demonstrated. Phase diagrams of a new type are constructed.

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  6. [해외논문]   An ultrahigh pressure homogenization technique for easily exfoliating few-layer phosphorene from bulk black phosphorus   SCI SCIE

    Guan, Qing-Qing (Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China ) , Zhou, Hua-Jing (Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China ) , Ning, Ping (Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China ) , Lian, Pei-Chao (Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, 650500, China ) , Wang, Bo (Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, 650500, China ) , He, Liang (Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, 650500, China ) , Chai, Xin-Sheng (State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, China)
    Physica. B, Condensed matter v.537 ,pp. 18 - 22 , 2018 , 0921-4526 ,

    초록

    Abstract We have developed an easy and efficient method for exfoliating few-layer sheets of black phosphorus (BP) in N -methyl-2-pyrrolidone, using ultra-high pressure homogenization (UPH). The BP was first exfoliated into sheets that were a few atomic layers thick, using a homogenizer for only 30 min. Next, a double centrifugation procedure was used to separate the material into few-layer nanosheets that were examined by X-ray diffraction, atomic force microscopy (AFM), transmission electron microscopy (TEM), high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM), and energy-dispersive X-ray (EDX) spectroscopy. The results show that the products are specimens of phosphorene that are only a few-layer thick.

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  7. [해외논문]   Low-cost and eco-friendly nebulizer spray coated CuInAlS2 counter electrode for dye-sensitized solar cells   SCI SCIE

    Dhas, C. Ravi (PG & Research Department of Physics, Bishop Heber College (Autonomous), Tiruchirappalli, 620 017, Tamil Nadu, India ) , Christy, A. Jennifer (PG & Research Department of Physics, Bishop Heber College (Autonomous), Tiruchirappalli, 620 017, Tamil Nadu, India ) , Venkatesh, R. (PG & Research Department of Physics, Bishop Heber College (Autonomous), Tiruchirappalli, 620 017, Tamil Nadu, India ) , S., Esther Santhoshi Monica (PG & Research Department of Physics, Bishop Heber College (Autonomous), Tiruchirappalli, 620 017, Tamil Nadu, India ) , Panda, Subhendu K. (CSIR-Central Electrochemical Research Institute (CECRI), Karaikudi, 630 006, India ) , Subramanian, B. (CSIR-Central Electrochemical Research Institute (CECRI), Karaikudi, 630 006, India ) , Ravichandran, K. (Department of Physics, AVVM Sri Pushpam College (Autonomous), Poondi, Thanjavur, 613 503, Tamil Nadu, India ) , Sudhagar, P. (Photocatalyst and Coatings Group, SPECIFIC, College of Engineering, Swansea University (Bay Campus), Fabianway, Swansea, SA1 8EN, United Kingdom ) , Raj, A. Moses Ezhil (Department of Physics, Scott Christian College (Autonomous), Nagercoil, 629 003, Tamil Nadu, India)
    Physica. B, Condensed matter v.537 ,pp. 23 - 32 , 2018 , 0921-4526 ,

    초록

    Abstract CuInAlS 2 thin films for different substrate temperatures were deposited by a novel nebulizer spray technique. The polycrystalline CIAS thin film exhibited tetragonal structure with the preferential orientation of (1 1 2) plane. Nanoflakes were observed from the surface morphology of CIAS film. The peak position of core level spectra confirms the presence of CuInAlS 2 from XPS analysis. The absorbance spectra and optical band gap were observed from the optical property. The activation energy, carrier concentration, hole mobility and resistivity were determined by linear four probe and Hall effect measurements. The CIAS film was used as a counter electrode (CE) in dye-sensitized solar cells (DSSCs) and is characterized by cyclic voltammetry, electrochemical impedance spectroscopy and Tafel measurements. DSSC fabricated with the CIAS CE achieved the photo conversion efficiency of about 2.55%. Highlights First report on simple design and cost-effective nebulizer spray deposited CuInAlS2 thin films. The nanoflake-like morphology was examined by SEM analysis. CuInAlS2 thin films were used as the counter electrodes in dye sensitized solar cells. The maximum efficiency achieved for CIAS counter electrode is about 2.55%. Graphical abstract [DISPLAY OMISSION]

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  8. [해외논문]   Condensation of nano-refrigerant inside a horizontal tube   SCI SCIE

    Darzi, Milad (Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO, 65201, USA ) , Sadoughi, M.K. (Department of Mechanical Engineering, Iowa State University, Ames, IA, 50011, USA ) , Sheikholeslami, M. (Department of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Iran)
    Physica. B, Condensed matter v.537 ,pp. 33 - 39 , 2018 , 0921-4526 ,

    초록

    Abstract In this paper, condensing pressure drop of refrigerant-based nanofluid inside a tube is studied. Isobutene was selected as the base fluid while CuO nanoparticles were utilized to prepare nano-refrigerant. However, for the feasibility of nanoparticle dispersion into the refrigerant, Polyester oil (POE) was utilized as lubricant oil and added to the pure refrigerant by 1% mass fraction. Various values of mass flux, vapor quality, concentration of nanoparticle are investigated. Results indicate that adding nanoparticles leads to enhance frictional pressure drop. Nanoparticles caused larger pressure drop penalty at relatively lower vapor qualities which may be attributed to the existing condensation flow pattern such that annular flow is less influenced by nanoparticles compared to intermittent flow regime. Highlights Condensing pressure drops of R600a/oil/CuO nano-refrigerant were studied. Nanoparticles always caused pressure drop penalty. The influence of nanoparticles on penalty decreases with increase of x. Annular flows were found to be less affected by nanoparticles.

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  9. [해외논문]   Quantum confined Stark effects of single dopant in polarized hemispherical quantum dot: Two-dimensional finite difference approach and Ritz-HassE variation method   SCI SCIE

    El Harouny, El Hassan (Laboratoire de Physique de la Matière Condensée, Département de Physique, Faculté) , Nakra Mohajer, Soukaina (des Sciences, Université) , Ibral, Asmaa (Abdelmalek Essaadi, B. P. 2121 M'Hannech II, 93030 Tétouan, Morocco ) , El Khamkhami, Jamal (Laboratoire de Physique de la Matière Condensée, Département de Physique, Faculté) , Assaid, El Mahdi (des Sciences, Université)
    Physica. B, Condensed matter v.537 ,pp. 40 - 50 , 2018 , 0921-4526 ,

    초록

    Abstract Eigenvalues equation of hydrogen-like off-center single donor impurity confined in polarized homogeneous hemispherical quantum dot deposited on a wetting layer, capped by insulated matrix and submitted to external uniform electric field is solved in the framework of the effective mass approximation. An infinitely deep potential is used to describe effects of quantum confinement due to conduction band offsets at surfaces where quantum dot and surrounding materials meet. Single donor ground state total and binding energies in presence of electric field are determined via two-dimensional finite difference approach and Ritz-HassE variation principle. For the latter method, attractive coulomb correlation between electron and ionized single donor is taken into account in the expression of trial wave function. It appears that off-center single dopant binding energy, spatial extension and radial probability density are strongly dependent on hemisphere radius and single dopant position inside quantum dot. Influence of a uniform electric field is also investigated. It shows that Stark effect appears even for very small size dots and that single dopant energy shift is more significant when the single donor is near hemispherical surface. Highlights We solve Poisson equation in the case of Hemispherical Quantum Dot deposited on a wetting layer, capped by insulating matrix and submitted to electrostatic field. We derive, for the first time, authentic analytic expressions for scalar electrostatic potential inside and outside, polarization vector inside and electrostatic field vector inside and outside. We investigate Stark effect on an off-center single dopant confined in polarized HQD using finite difference approach and Ritz-HassE variation principle. We show that position and electrostatic field strength have important effects on single dopant energy and radial probability density.

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  10. [해외논문]   Low-temperature matrix effects on orientational motion of Methyl radical trapped in gas solids: Angular tunneling vs. libration   SCI SCIE

    Dmitriev, Yurij A. (Ioffe Institute, 26 Politekhnicheskaya ul., 194021 St. Petersburg, Russia ) , Zelenetckii, Ilia A. (Department of System Analysis and Control, Institute of Computer Science and Technology, Peter the Great St. Petersburg Polytechnic University, 29 Politekhnicheskaya ul., 195251 St. Petersburg, Russia ) , Benetis, Nikolas P. (Departments of Environmental Engineering and Antipollution Control, Technological Educational Institute of Western Macedonia (TEI), Kila 50 100 Kozani, Greece)
    Physica. B, Condensed matter v.537 ,pp. 51 - 57 , 2018 , 0921-4526 ,

    초록

    Abstract EPR investigation of the lineshape of matrix -isolated methyl radical, CH 3 , spectra recorded in solid N 2 O and CO 2 was carried out. Reversible temperature-dependent line width anisotropy was observed in both matrices. This effect is a fingerprint of the extra-slow radical rotation about the in-plane C 2 axes. The rotation was found to be anisotropic and closely correlated to the orientational dynamics of the matrix molecules. It was suggested that a recently discovered “hoping precession” effect of matrix molecules in solid CO 2 is a common feature of matrices of the linear molecules CO, N 2 O, and CO 2 . A new low-temperature matrix effect, referred to as “libration trap”, was proposed which accounts for the changing CH 3 reorientational motion about the radical C 3 -axis from rotation to libration. Temperature dependence of the intensity of the EPR satellites produced by these nonrotating—but librating methyls was presented. This allowed for a rough estimation of the rotation hindering potential due to correlation mismatch between the radical and the nearest matrix molecules' librations. Methyl radical rotation in matrices of solid N2O and CO2 studied by EPR. Motion of matrix isolated methyl correlates with matrix molecular motion. Theory shows wide angle torsional oscillations of matrix isolated methyl. Anisotropic tunneling rotation and excited libration of methyl in solid gases.

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