Browsing by Author "Stefanov P."

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    Preparation and characterization of SnO2 films for sensing applications
    (2008-01-01) Stefanov P.; Atanasova G.; Manolov E.; Raicheva Z.; Lazarova V.
    SnO2 thin films for gas sensing applications were deposited by RF sputtering in a mixture of oxygen and argon. The morphology, structure and composition of the SnO2 films were analysed by XRD, SEM and XPS. SnO2 thin films showed a crystalline structure with a submicron particle size of 200 nm. The electronic structure of the film surface was elucidated by analysis of the photoelectron core level and valence band spectra of Sn.
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    XPS characterization of TiO2 layers deposited on quartz plates
    (2008-03-01) Stefanov P.; Shipochka M.; Stefchev P.; Raicheva Z.; Lazarova V.; Spassov L.
    TiO2 layers for gas sensing applications were obtained by Liquid Phase Deposition (LPD). The layers were deposited on gold-coated piezoelectric quartz crystals. The surface structure, morphology and chemical properties were analysed by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and X-ray Photoelectron Spectroscopy (XPS). SEM showed that the layers were porous and composed of uniform crystalline grains. XPS indicated them to be non-stoichiometric. © 2008 IOP Publishing Ltd.