Research Article
Ag Nanorod Arrays for SERS: Aspects of Spectral Reproducibility, Surface Contamination, and Spectral Sensitivity
Figure 4
SERS spectra of tryptophan on two different AgOADs and demonstration of the effect of cleaning: (a) 1 × 10−4 M tryptophan on contaminated substrate, (b) tryptophan on clean substrate kept in vacuum overnight, 1 × 10−4 M (1) and 1 × 10−5 M concentration (2), and (c) 1 × 10−4 M tryptophan on contaminated substrate after 5 min. ultrasonic cleaning. Positions of main anomalous bands are marked with asterisks. Inset: chemical structure of tryptophan.