Comparison of substrates and neat benzene thiol, Raman spectra, and spatial mapping. (a) Comparison of the SERS of substrates P-AAO-Au, W-AAO1-Au, and W-AAO2-Au. (b) Comparison of the SERS of substrates W-AAO2-Au (red), Klarite® (blue), and neat Raman spectra (black) of benzene thiol collected at 785-nm incident. (c) Zoomed-in region of the spectra showing the three primary modes located near 1,000 cm-1, with the 998 cm-1 used for calculation of the SERS enhancement factor. The number of molecules of benzene thiol that each measurement is probing is denoted in the figure. (d) Spatial mapping of the SERS intensity at 998 cm-1 of SERS substrate W-AAO2-Au over an area larger than 20 μm × 20 μm. The background is the optical reflection image of substrate W-AAO2-Au photographed through a microscope with a × 50 objective.
Jiwei et al. Nanoscale Research Letters 2013 8:495 doi:10.1186/1556-276X-8-495