1097-4555/asset/JRS_left.gif?v=1&s=475c5d1eb68187e9c422b4e837705fad1c054c4c)
1097-4555/asset/JRS_right.gif?v=1&s=12bba9e41976320d842f1cf98eae9a4b27d5913d)
Research Article
Gold-coated zinc oxide nanowire-based substrate for surface-enhanced Raman spectroscopy
Article first published online: 29 MAY 2009
DOI: 10.1002/jrs.2296
Copyright © 2009 John Wiley & Sons, Ltd.
1097-4555/asset/cover.gif?v=1&s=d2563a28f6ee44d20c855dfca1ce107304920493 "Journal of Raman Spectroscopy")
Additional Information
How to Cite
Khan, M. A., Hogan, T. P. and Shanker, B. (2009), Gold-coated zinc oxide nanowire-based substrate for surface-enhanced Raman spectroscopy. J. Raman Spectrosc., 40: 1539–1545. doi: 10.1002/jrs.2296
Publication History
- Issue published online: 11 NOV 2009
- Article first published online: 29 MAY 2009
- Manuscript Accepted: 19 FEB 2009
- Manuscript Received: 4 NOV 2008
Funded by
- NSF Nanoscale Exploratory Research (NER). Grant Number: 0609192
- Abstract
- References
- Cited By
Keywords:
- surface-enhanced Raman spectroscopy (SERS);
- zinc oxide nanowires
Abstract
Zinc oxide nanowires with two distinct morphologies were synthesized on silicon substrates using a simple thermal evaporation and vapor transport method in an oxidizing environment. The as-synthesized nanowires were coated with gold to allow excitation of surface plasmons over a broad frequency range. SERS studies with near-IR excitation at 785 nm showed significant enhancement (average enhancement > 106) with excellent reproducibility to detect monolayer concentrations of 4-methylbenzenethiol (4-MBT) and 1,2-benzendithiol (1,2-BDT) probe molecules. The Raman enhancement showed a strong dependence on the gold film thickness, and the peak enhancement was observed for a ∼40-nm-thick film. The Raman enhancement was stronger for randomly oriented nanowires compared to aligned ones suggesting the importance of contributions from the junctions of nanowires. Copyright © 2009 John Wiley & Sons, Ltd.