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Author: Barth, Sven × End date: 2019 × DDC: 540 × Has files: Yes × Type: Article × WGL Institute: INM ×

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Now showing 1 - 3 of 3
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    Plasma-assisted modulation of morphology and composition in Tin oxide nanostructures for sensing applications
    (Saarbrücke : Leibniz-Institut für Neue Materialien, 2007) Mathur, Sanjay; Ganesan, Rajesh; Ruegamer, Thomas; Shen, Hao; Barth, Sven
    [no abstract available]
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    One-dimensional oxide nanostructures: growth, applications and devices
    (Saarbrücke : Leibniz-Institut für Neue Materialien, 2008) Barth, Sven; Mathur, Sanjay; Hernandez-Ramireza, Francisco; Romano-Rodrigueza, Albert
    One dimensional (1D) inorganic materials are gaining high attention due to their structural stability and unique structural fatures. Among them, oxides are widely studied due to their well established application potential and mechanical as well as chemical stability. We have developed a generic approach for size-selective and site-specific growth of oxide nanowires by combination of a catalyst assisted growth mechanism and a molecular precursor approach, which is a viable alternative to other gas phase and solution procedures and produces well-defined (morphology and composition) materials.
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    Influence of precursor chemistry on CVD grown TiO2 coatings: differential cell growth and biocompatibility
    (Cambridge : Royal Society of Chemistry, 2013) Altmayer, Jessica; Barth, Sven; Mathur, Sanjay
    Nanocrystalline titanium oxide (TiO2) coatings with different phases and surface topographies were deposited using chemical vapor deposition (CVD) of different homo- and heteroleptic titanium precursors of general formula [XTi(OiPr)3] (X = Cl (1), -NEt2 (2), -N(SiMe3)2 (3), -C5H5 (4), -OiPr (5) and -OtBu (6)) to elucidate the influence of molecular configuration on resulting material properties. The interdependence of precursor chemistry and materials features of the CVD deposits was verified by performing film growth under similar conditions using different precursor molecules (1-6). Studies on composition (XPS), structure (SEM, XRD) and bio-functional properties (cell tests) revealed that the decomposition process is markedly influenced by the auxiliary ligands, which led to incorporation of heteroelements (Si, Cl, N) in the films. Cell tests performed to evaluate the biocompatibility of the coatings towards the growth of bone cells showed a pronounced correlation between cell adhesion and surface morphology as well as the chemical composition. Growth of osteoblast cells was strongly enhanced on films obtained using [Ti(OiPr)4] and [CpTi(OiPr)3], whereas TiO2 coatings produced by [ClTi(OiPr)3] significantly inhibited the cell growth and their proliferation due to Cl contamination. Also, the nanomorphological features of the films were found to stimulate the cell adhesion and growth.