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      Anemone-like nanostructures for non-lithographic reproducible large-area and ultra-sensitive SERS substrates

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      Author(s)
      Daglar, B.
      Demirel, G. B.
      Khudiyev, T.
      Dogan, T.
      Tobail O.
      Altuntas, S.
      Buyukserin F.
      Bayındır, Mehmet
      Date
      2014
      Source Title
      Nanoscale
      Print ISSN
      2040-3364
      Publisher
      Royal Society of Chemistry
      Volume
      6
      Issue
      21
      Pages
      12710 - 12717
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      The melt-infiltration technique enables the fabrication of complex nanostructures for a wide range of applications in optics, electronics, biomaterials, and catalysis. Here, anemone-like nanostructures are produced for the first time under the surface/interface principles of melt-infiltration as a non-lithographic method. Functionalized anodized aluminum oxide (AAO) membranes are used as templates to provide large-area production of nanostructures, and polycarbonate (PC) films are used as active phase materials. In order to understand formation dynamics of anemone-like structures finite element method (FEM) simulations are performed and it is found that wetting behaviour of the polymer is responsible for the formation of cavities at the caps of the structures. These nanostructures are examined in the surface-enhanced-Raman-spectroscopy (SERS) experiment and they exhibit great potential in this field. Reproducible SERS signals are detected with relative standard deviations (RSDs) of 7.2-12.6% for about 10 000 individual spots. SERS measurements are demonstrated at low concentrations of Rhodamine 6G (R6G), even at the picomolar level, with an enhancement factor of ∼1011. This high enhancement factor is ascribed to the significant electric field enhancement at the cavities of nanostructures and nanogaps between them, which is supported by finite difference time-domain (FDTD) simulations. These novel nanostructured films can be further optimized to be used in chemical and plasmonic sensors and as a single molecule SERS detection platform.
      Keywords
      SERS substrate
      Ultra sensitives
      Permalink
      http://hdl.handle.net/11693/26393
      Published Version (Please cite this version)
      http://dx.doi.org/10.1039/c4nr03909b
      Collections
      • Department of Physics 2550
      • Institute of Materials Science and Nanotechnology (UNAM) 2258
      • Nanotechnology Research Center (NANOTAM) 1179
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