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  • 1.
    Dimitriev, Oleg
    et al.
    NAS Ukraine, Ukraine.
    Fahlman, Mats
    Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, Faculty of Science & Engineering.
    Braun, Slawomir
    Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, Faculty of Science & Engineering.
    Energy level alignment at the interface of cadmium sulphide single crystal and phthalocyanines: The role of the crystal surface states2018In: Materials Chemistry and Physics, ISSN 0254-0584, E-ISSN 1879-3312, Vol. 205, p. 102-112Article in journal (Refereed)
    Abstract [en]

    Ultraviolet photoelectron spectroscopy was used to study energy levels of (0001) and (000 (1) over bar) surfaces of bare CdS crystal terminated with Cd and S atoms, respectively, as well as energy level alignment at hybrid interfaces of CdS crystal and donor zinc phthalocyanine (PcZn) or acceptor fluoro-substituted zinc phtalocyanine (F-PcZn) layers, respectively. The data allowed us to distinguish a slight difference between ionization potential of the Cd- and S-terminated facets of the crystal and different contribution of these surfaces to formation of the interfacial dipole at the hybrid interfaces. Ionization potential for the 5 terminated surface was slightly higher as compared to the Cd-terminated one for the same crystal, and a more, positive dipole was always created on the S-terminated surface independent of whether the donor or acceptor phthalocyanine was used. The results showed that PcZn and F-PcZn render a dual effect at the CdS surface. First, the molecules created a dipole at the interface, however, the sign of this dipole was opposite for PcZn and F-PcZn, respectively. Second, the both molecules contributed to the formation of a depletion layer near the crystal surface. The role of the surface states of the crystal in the above effects has been elucidated. Interaction of PcZn and CdS surface was associated with the pinning of the upper occupied level of the surface states to the positive charge transfer state corresponding to the oxidized HOMO level of the molecule at the interface, whereas interaction of F-PcZn and CdS surface with the pinning of the upper occupied level of the surface states to the negative charge transfer corresponding to the reduced LUMO level of the molecule at the interface, i.e., similar to what is observed for the metal organic interfaces, where an upper occupied level of semiconductor surface states in our case plays the role of Fermi level in metal. (C) 2017 Elsevier B.V. All rights reserved.

  • 2.
    Khan, Yaqoob
    et al.
    Pakistan Institute of Engineering and Applied Sciences.
    Durrani, S K
    Pakistan Institute of Nuclear Science and Technology.
    Mehmood, Mazhar
    Pakistan Institute of Engineering and Applied Sciences.
    Jan, Abdullah
    University of Peshawar.
    Abbasi, Mazhar Ali
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    pH-dependant structural and morphology evolution of Ni(OH)(2) nanostructures and their morphology retention upon thermal annealing to NiO2011In: Materials Chemistry and Physics, ISSN 0254-0584, E-ISSN 1879-3312, Vol. 130, no 3, p. 1169-1174Article in journal (Refereed)
    Abstract [en]

    Nickel hydroxide nanosheets, nanobelts and nanorods were prepared by hydrothermal treatment of the precipitates obtained at different pH values. The morphology and crystal structure of the products could be controlled simply by adjusting the pH value at precipitation. Interconnected nanosheets of hexagonal beta-Ni(OH)(2) with thickness around 10-20 nm were formed at pH similar to 11, whereas nanobelts with typical widths around 40-80 nm, and nanorods with diameters around 50-60 nm of phase pure alpha-Ni(OH)(2) containing intercalated sulphate ions were obtained in the pH range similar to 9.5-8.5. Thermal annealing of the hydroxides at 500 degrees C yielded cubic phase NiO with morphologies similar to their hydroxide precursors. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy ( FTIR), thermogravimetric analysis (TGA), and energy dispersive X-ray (EDX) analysis were used to characterize the as-prepared products. The role of pH in controlling the phase and morphology of the products was discussed.

  • 3.
    Kovalchuk, A. O.
    et al.
    National Academic Science Ukraine, Ukraine.
    Rudko, G. Yu.
    National Academic Science Ukraine, Ukraine.
    Fediv, V. I.
    Bukovinian State Medical University, Ukraine.
    Chen, Weimin
    Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials. Linköping University, Faculty of Science & Engineering.
    Buyanova, Irina
    Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials. Linköping University, Faculty of Science & Engineering.
    Phosphorescence of CdS nanoparticles in polymer matrix as an indication of host-guest interaction2016In: Materials Chemistry and Physics, ISSN 0254-0584, E-ISSN 1879-3312, Vol. 177, p. 379-383Article in journal (Refereed)
    Abstract [en]

    We report on the observation of the long-lasting low-temperature photoluminescence decay in the hybrid system nano-CdS/polyvinyl alcohol with a characteristic time of about 1.7 s. The origin of the phosphorescence is ascribed to the accumulation of photo-excited excitons in the traps within the polymeric matrix with subsequent transfer of the excitation to the embedded CdS nanoparticles. (C) 2016 Elsevier B.V. All rights reserved.

  • 4.
    Periyathambi, Prabu
    et al.
    Bio-Products Laboratory, Central Leather Research Institute, Adyar, Chennai 600 020, Tamil Nadu, India.
    Vedakumari, Weslen S.
    Bio-Products Laboratory, Central Leather Research Institute, Adyar, Chennai 600 020, Tamil Nadu, India.
    Bojja, Sreedhar
    Inorganic and Physical Chemistry Division, Indian Institute of Chemical Technology, Hyderabad 500 607, Andhra Pradesh, India.
    Kumar, Santhosh B.
    Bio-Products Laboratory, Central Leather Research Institute, Adyar, Chennai 600 020, Tamil Nadu, India.
    Sastry, Thotapalli P.
    Bio-Products Laboratory, Central Leather Research Institute, Adyar, Chennai 600 020, Tamil Nadu, India.
    Green biosynthesis and characterization of fibrin functionalized iron oxide nanoparticles with MRI sensitivity and increased cellular internalization2014In: Materials Chemistry and Physics, ISSN 0254-0584, E-ISSN 1879-3312, Vol. 148, no 3, p. 1212-1220Article in journal (Refereed)
    Abstract [en]

    Developing novel contrast agents for efficient MRI sensitivity is very essential for early diagnosis of cancer. In the present work, we have prepared novel, eco-friendly, non-toxic iron oxide nanoparticles (IONPs) as efficient MRI contrast agents. Earth abundant magnetite sand was used for the preparation of IONPs using acid leaching method. Further, co-precipitation method was used to obtain fibrin functionalized iron nanoparticles (F-IONPs). The nanoparticles were crystalline in nature with average size distribution values as 15 nm and 35 nm for IONPs and F-IONPs respectively. Haemolysis and MTT assay proved the biocompatibility of the prepared nanoparticles with their distribution across the cytoplasm and nucleus in NIH 3T3 cells. Moreover, MRI and VSM results revealed the magnetic property of F-IONPs, with the magnetic saturation value of 51.7 emu g−1. Thus, F-IONPs with good cytocompatibility and high magnetic property can serve as a novel platform for enhanced MRI sensitivity and drug delivery.

  • 5.
    Sadollah Khani, Azar
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering. Shahid Chamran University, Iran.
    Kazeminezhad, Iraj
    Shahid Chamran University, Iran.
    Nour, Omer
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
    Willander, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
    Cation exchange assisted low temperature chemical synthesis of ZnO@Ag2S core-shell nanoparticles and their photo-catalytic properties2015In: Materials Chemistry and Physics, ISSN 0254-0584, E-ISSN 1879-3312, Vol. 163, p. 485-495Article in journal (Refereed)
    Abstract [en]

    In this study ZnO@Ag2S core shell nanoparticles (CSNPs) were synthesized by a chemical approach at a relatively low temperature of around 60 degrees C. The shell material was obtained by transferring a ZnS shell synthesized at around bare a ZnO nanoparticles (NPs) to Ag2S. This transfer was achieved at temperature of around 60 degrees C owing to the relatively low value of the solubility product constant of Ag2S compared to that of ZnS. The as-grown ZnO@Ag2S core shell NPs were used as a photocatalyst to degrade Eriochrome black-T dye. Since dye pollutants can be found in mediums with different pH, the degradation experiments were performed at basic and acidic pH values. Photo-decolonization experiments of Eriochrome black-T dye indicated that the ZnO@Ag2S CSNPs act more efficiently as a photcatalyst for both acidic and basic pH values compared to bare ZnO NPs. Then the reusability of the nano-catalyst was tested to confirm that it can be applied as an effective and recyclable photocatalyst. (C) 2015 Elsevier B.V. All rights reserved.

  • 6.
    Stefanov, P
    et al.
    Bulgarian Academy of Sciences, Sofia .
    Stoychev, D
    Bulgarian Academy of Sciences, Sofia .
    Valov, I
    Bulgarian Academy of Sciences, Sofia .
    Kakanakova-Georgieva, Anelia
    Bulgarian Academy of Sciences, Sofia .
    Marinova, Ts
    Bulgarian Academy of Sciences, Sofia .
    Electrochemical deposition of thin zirconia films on stainless steel 316 L2000In: Materials Chemistry and Physics, ISSN 0254-0584, E-ISSN 1879-3312, Vol. 65, no 2, p. 222-225Article in journal (Refereed)
    Abstract [en]

    Zirconia films (ZrO2) have been deposited electrochemically on stainless steel SS 316 L in a non-aqueous electrolyte based on absolute ethyl alcohol and ZrCl4. Scanning electron microscopy (SEM) studies have shown that the film consists of crystallites with a spheroidal shape, forming agglomerates with a very large surface area. Their sizes vary within the range of 0.1–0.5 μm. The layer composition is very close to the stoichiometric ZrO2, as has been determined by X-ray photoelectron spectroscopy (XPS).

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