Metal-dielectric-CNT nanowires for femtomolar chemical detection by surface enhanced Raman spectroscopy

Ali Ozhan Altun; Seul Ki Youn; Nuri Yazdani; Tiziana Bond; Hyung Gyu Park

doi:10.1002/adma.201300571

Metal-dielectric-CNT nanowires for femtomolar chemical detection by surface enhanced Raman spectroscopy

Adv Mater. 2013 Aug 27;25(32):4431-6. doi: 10.1002/adma.201300571. Epub 2013 May 21.

Authors

Ali Ozhan Altun¹, Seul Ki Youn, Nuri Yazdani, Tiziana Bond, Hyung Gyu Park

Affiliation

¹ Institute of Energy Technology, Department of Mechanical and Process Engineering, ETH Zürich, Zürich, Switzerland.

PMID: 23696098
DOI: 10.1002/adma.201300571

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.

Keywords: SERS; energy coupling barrier; femtomolar detection; metal-dielectric-CNT nanowires.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

Ethylenes / analysis*
Gold / chemistry
Nanotubes, Carbon / chemistry*
Nanowires / chemistry*
Pyridines / analysis*
Spectrum Analysis, Raman / methods*
Surface Properties

Substances

1,2-bis(2-pyridyl)ethylene
Ethylenes
Nanotubes, Carbon
Pyridines
Gold