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(A) Baseline-subtracted SERS spectra (offset) from probes made from 1 μM of IR-780 (red) and 4-MBA (black) on NS; SERRS intensity from the former was several orders of magnitude greater than intensity from the latter. (B) Baseline-subtracted SERRS spectra (offset) from 1 μM of IR-780 added onto nanostars (red), gold spheres (blue) and silver spheres (black) of similar sizes. The spectra were collected under 785 nm excitation (100 mW, 100 msec, 10 averages).
