title: Metal-dielectric-CNT nanowires for femtomolar chemical detection by surface enhanced Raman spectroscopy.
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.
authors.affiliation: Institute of Energy Technology, Department of Mechanical and Process Engineering, ETH Zürich, Zürich, Switzerland.
authors.forename: Ali Ozhan
authors.initials: AO
authors.lastname: Altun
authors.forename: Seul Ki
authors.initials: SK
authors.lastname: Youn
authors.forename: Nuri
authors.initials: N
authors.lastname: Yazdani
authors.forename: Tiziana
authors.initials: T
authors.lastname: Bond
authors.forename: Hyung Gyu
authors.initials: HG
authors.lastname: Park
mesh_terms: D005030:Ethylenes / Q000032:analysis*; D006046:Gold / Q000737:chemistry; D037742:Nanotubes, Carbon / Q000737:chemistry*; D053770:Nanowires / Q000737:chemistry*; D011725:Pyridines / Q000032:analysis*; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013499:Surface Properties
chemical_list: C530364:1,2-bis(2-pyridyl)ethylene; D005030:Ethylenes; D037742:Nanotubes, Carbon; D011725:Pyridines; D006046:Gold
keywords: SERS; energy coupling barrier; femtomolar detection; metal-dielectric-CNT nanowires