SERS Microspectroscopy of Biomolecules on Dried Ag Colloidal Drops

Figure 1

Optical microscope images of a dried Ag hydroxylamine-reduced colloid/TMPyP drop with 1 × 10⁻⁷ M TMPyP concentration: edge part of the drop (a) and detail of the ring (b).

(a)

(b)