Synthesis of nanostructured solid-state phases of V7O16 and V2O5 compounds for ppb-level detection of ammonia

• Solid state phase of V7O16 with separate V2O5 phase were fabricated by pulsed laser deposition. The crystal structure and symmetry of the deposited films were studied with X-ray diffraction and Raman spectroscopy, respectively. Rietveld analysis was performed to the X-ray diffraction measurement results. The surface potentials and morphologies of the films were studied with atomic force microscopy, and microstructure of the thin films was analysed by transmission electron microscopy. Raman spectroscopy and Rietveld refinement results confirmed that the thin-film crystal structures varied between orthorombic V2O5 phase and another phase, triclinic V2016, previously found only in the walls of vanadium oxide nanotubes (VOx, -NT), bound together with organic amine. We have earlier presented the first results of stable and pure metal -oxide solid-state phase of V2016 manufactured from ceramic V205 target. Here we show more detailed study of these structures. The microstructure studies showed a variation on the porosity of the films according to crystal structures and also some fibre -like nanostructures were found in the films. The surface morphology depended strongly on the crystal structure and the surface potential studies showed 50 meV difference in the work function values between the phases. Compounds were found to be extremely sensitive towards ammonia, NH3, down to 40 ppb concentrations, and have shown to have the stability and selectivity to control the Selective Catalytic Reduction process, where nitrogen oxides are reduced by ammonia in, e.g. diesel exhausts.

Ämnesord

NATURVETENSKAP  -- Fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Nyckelord

Vanadium oxides; Mixed phase; V7O16; V2O5; Thin film

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