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Suche nach „[S.] [Habouti]“ hat 2 Publikationen gefunden
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    NachhaltigEuropan Campus Rottal-Inn

    Zeitschriftenartikel

    C.-H. Solterbeck, M. Mátéfi-Tempfli, M. Es-Souni, Stefan Mátéfi-Tempfli, S. Habouti

    On-substrate, self-standing Au-nanorods arrays showing morphology controlled properties

    Nano Today, vol. 6, no. 1, pp. 12-19

    2011

    DOI: 10.1016/j.nantod.2010.11.001

    Abstract anzeigen

    We use supported alumina templates and electrodeposition to fabricate self-standing Au-nanorods (Au-NR) arrays. Depending on electrolyte and deposition conditions two different NR morphologies with either corrugated or smooth topologies are fabricated. We show that the properties of the NR arrays, including amphiphilic and optical, very much depend on their morphology. Smooth NR arrays are hydrophobic while the corrugated ones are hydrophilic. Also the optical reflectance, though it shows plasmon resonances at very similar wave lengths, is much lower for the corrugated NR arrays. The activity of the NR arrays as substrates for molecular detection using Raman scattering, and Rhodamine 6G (R6G) as model dye, also strongly depends on their morphology. R6G concentrations down to 1 pM are detected on the corrugated arrays yielding an effective enhancement factor (EF) of approximately 1 × 109. In contrast an over-estimated (because of their hydrophobic character) EF of 6 × 106 is obtained for the smooth NR arrays.

    NachhaltigEuropan Campus Rottal-Inn

    Zeitschriftenartikel

    C.-H. Solterbeck, M. Mátéfi-Tempfli, M. Es-Souni, Stefan Mátéfi-Tempfli, S. Habouti

    Self-standing corrugated Ag and Au-Nanorods as plasmonic substrates

    Journal of Materials Chemistry, vol. 21, pp. 6269-6273

    2011

    Abstract anzeigen

    We use home-made Si-supported anodized alumina thin film templates for the electrodeposition of large area self-standing Ag- and Au-nanorod (Au-NR) arrays. The deposition conditions chosen, i.e. electrolyte composition and deposition voltage, lead to a corrugated rod morphology, particularly for Au-NRs. Instantaneous nucleation followed by diffusion-controlled growth are thought to be the dominating mechanism for the morphology observed. Diffuse reflectance spectra show specific behaviours of Ag- and Au-NRs with longitudinal and transverse plasmon resonance modes and additional modes for Ag-NRs. The activity of the NR arrays as substrates for molecular detection using Raman scattering and Rhodamine 6G (R6G) as a model dye strongly depends on noble metal. R6G concentrations down to 1 pM are detected on the corrugated arrays yielding an effective enhancement factor (EF) of approximately 2 × 1010 for Ag-NRs and 1 × 109 for Au-NRs. The latter is the highest ever obtained for Au-nanostructures. Both nanostructures provide an enhancement that is high enough to detect single molecules using Raman scattering. The results are rationalized in terms of morphology effects on electromagnetic field intensity.