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Advanced Materials

Metal-Dielectric-CNT Nanowires for Femtomolar Chemical Detection by Surface Enhanced Raman Spectroscopy

Authors

  • Ali Ozhan Altun,

    1. Institute of Energy Technology, Department of Mechanical and Process Engineering, ETH Zürich, Zürich CH-8092, Switzerland
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  • Seul Ki Youn,

    1. Institute of Energy Technology, Department of Mechanical and Process Engineering, ETH Zürich, Zürich CH-8092, Switzerland
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  • Nuri Yazdani,

    1. Institute of Energy Technology, Department of Mechanical and Process Engineering, ETH Zürich, Zürich CH-8092, Switzerland
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  • Tiziana Bond,

    Corresponding author
    1. Engineering Directorate, Lawrence Livermore National Laboratory, LLC, Livermore, CA 94550, USA
    • Engineering Directorate, Lawrence Livermore National Laboratory, LLC, Livermore, CA 94550, USA.
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  • Hyung Gyu Park

    Corresponding author
    1. Institute of Energy Technology, Department of Mechanical and Process Engineering, ETH Zürich, Zürich CH-8092, Switzerland
    • Institute of Energy Technology, Department of Mechanical and Process Engineering, ETH Zürich, Zürich CH-8092, Switzerland
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Abstract

A highly sensitive substrate for surface enhanced Raman spectroscopy (SERS) is formed by arrays of gold-coated metallic carbon nanotubes having a nanoinsert of high-k dielectric (hafnia) as an energy coupling barrier. Repeated femtomolar detection of 1,2 bis-(4-pyridyl)-ethylene in solution demonstrates the critical contribution of this plasmonic energy coupling barrier to the enhanced chemical sensitivity.

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