Silver-decorated carbon nanotube networks as SERS substrates
Article first published online: 18 FEB 2011
Copyright © 2011 John Wiley & Sons, Ltd.
Journal of Raman Spectroscopy
Volume 42, Issue 6, pages 1255–1262, June 2011
How to Cite
Chen, Y.-C., Young, R. J., Macpherson, J. V. and Wilson, N. R. (2011), Silver-decorated carbon nanotube networks as SERS substrates. J. Raman Spectrosc., 42: 1255–1262. doi: 10.1002/jrs.2862
- Issue published online: 17 JUN 2011
- Article first published online: 18 FEB 2011
- Manuscript Accepted: 1 NOV 2010
- Manuscript Received: 19 MAR 2010
- localized surface plasmon resonance;
- single-molecule SERS detection;
- dark-field optical microscopy;
- carbon nanotubes
We report on investigations upon a surface-enhanced Raman scattering (SERS) substrate produced from a two-dimensional single-walled carbon nanotube (SWNT) network decorated with Ag nanoparticles. Using the strong and unique Raman spectrum of SWNTs as a reference, the SWNT/Ag nanostructure can be considered to provide two regions: one with an ultrasensitive SERS response for single-molecule SERS (SMSERS) study; and another with uniform SERS enhancement over an area of several square millimeters for general SERS measurements. We report the appearance of an anomalous Raman feature at around 2180 cm−1 in the high-sensitivity region which exhibits the characteristics of SMSERS. The SERS performance of the uniform area was characterized using pyridine vapor adsorbed onto the substrate. The presence of the SWNT/Ag nanostructure enhanced the Raman intensity by over seven orders of magnitude, a factor comparable to or exceeding that obtained on SERS substrates reported by other groups. The results indicate great potential to produce highly sensitive, uniform SERS substrates via further fine-tuning of the nanostructure. Copyright © 2011 John Wiley & Sons, Ltd.