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Subject: X-ray photoelectron spectroscopy × WGL Institute: IPHT ×

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Now showing 1 - 3 of 3
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    XPS investigations of MOCVD tin oxide thin layers on Si nanowires array
    (Amsterdam : Elsevier, 2018) Turishchev, S.Yu.; Chuvenkova, Olga; Parinova, V.E.; Koyuda, D.A.; Chumakov, Ratibor G.; Presselt, Martin; Schleusener, Alexander; Sivakov, Vladimir
    Tin oxide thin layers were grown by metal-organic chemical vapor deposition technique on the top-down nanostructured silicon nanowires array obtained by metal-assisted wet-chemical technique from single crystalline silicon wafers. The composition of the formed layers were studied by high-resolution X-ray photoelectron spectroscopy of tin (Sn 3d) and oxygen (O 1 s) atoms core levels. The ion beam etching was applied to study the layers depth composition profiles. The composition studies of grown tin oxide layers is shown that the surface of layers contains tin dioxide, but the deeper part contains intermediate tin dioxide and metallic tin phases.
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    On the possibility of PhotoEmission Electron Microscopy for E. coli advanced studies
    (Amsterdam [u.a.] : Elsevier, 2020) Turishchev, S.Yu.; Marchenko, D.; Sivakov, V.; Belikov, E.A.; Chuvenkova, O.A.; Parinova, E.V.; Koyuda, D.A.; Chumakov, R.G.; Lebedev, A.M.; Kulikova, T.V.; Berezhnoy, A.A.; Valiakhmedova, I.V.; Praslova, N.V.; Preobrazhenskaya, E.V.; Antipov, S.S.
    The novel approach was proposed for detailed high-resolution studies of morphology and physico-chemical properties concomitantly at one measurement spot of E. coli bacterial cells culture immobilized onto silicon wafer surface in UHV conditions applying PhotoEmission Electron Microscopy under Hg lamp irradiation. For the E. coli characterization scanning electron microscopy (electron beam) and X-ray photoelectron spectroscopy (X-ray tube radiation) were applied prior to PhotoEmission Electron Microscopy measurements. In spite of irradiation doses collected for the cell arrays we were successful in detection of high-resolution images even of single E. coli bacterium by PhotoEmission Electron Microscopy technique followed by detailed high-resolution morphology studies by scanning electron microscopy. These results revealed widespread stability of the E. coli membranes shape after the significant number of applied characterization techniques. © 2019 The Authors
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    Morphology and Microstructure Evolution of Gold Nanostructures in the Limited Volume Porous Matrices
    (Basel : MDPI, 2020) Yakimchuk, Dzmitry V.; Bundyukova, Victoria D.; Ustarroz, Jon; Terryn, Herman; Baert, Kitty; Kozlovskiy, Artem L.; Zdorovets, Maxim V.; Khubezhov, Soslan A.; Trukhanov, Alex V.; Trukhanov, Sergei V.; Panina, Larissa V.; Arzumanyan, Grigory M.; Mamatkulov, Kahramon Z.; Tishkevich, Daria I.; Kaniukov, Egor Y.; Sivakov, Vladimir
    The modern development of nanotechnology requires the discovery of simple approaches that ensure the controlled formation of functional nanostructures with a predetermined morphology. One of the simplest approaches is the self-assembly of nanostructures. The widespread implementation of self-assembly is limited by the complexity of controlled processes in a large volume where, due to the temperature, ion concentration, and other thermodynamics factors, local changes in diffusion-limited processes may occur, leading to unexpected nanostructure growth. The easiest ways to control the diffusion-limited processes are spatial limitation and localized growth of nanostructures in a porous matrix. In this paper, we propose to apply the method of controlled self-assembly of gold nanostructures in a limited pore volume of a silicon oxide matrix with submicron pore sizes. A detailed study of achieved gold nanostructures' morphology, microstructure, and surface composition at different formation stages is carried out to understand the peculiarities of realized nanostructures. Based on the obtained results, a mechanism for the growth of gold nanostructures in a limited volume, which can be used for the controlled formation of nanostructures with a predetermined geometry and composition, has been proposed. The results observed in the present study can be useful for the design of plasmonic-active surfaces for surface-enhanced Raman spectroscopy-based detection of ultra-low concentration of different chemical or biological analytes, where the size of the localized gold nanostructures is comparable with the spot area of the focused laser beam.