Figure 6

Background-subtracted SERS spectra maps of the intensity at ∼205 cm⁻¹ mode of CV measured at an excitation wavelength of 633 nm: 100 × 100 μm² maps (a) with a spatial resolution of 5 μm and their corresponding histograms (b) and 1 × 0.5 mm² map (c) with a spatial resolution of 50 μm.