Figure 4
From: Simple and effective graphene laser processing for neuron patterning application
Raman characterization.
(a) Comparison of Raman spectra collected on two pristine samples under the same conditions with labelled peaks: the Raman signal on SiO2 (black) is enhanced 5 times in respect to glass (red). (b) Raman component color map of the upper left edge of the square irradiated at 0.15 J/cm2 in type 1 sample; (c) same type of map on a region irradiated at 0.10 J/cm2. The maps have been generated by taking the fitted Raman spectra of unmodified SLG as component. The presence of the graphene Raman component along the horizontal section is plotted as a white line: at 0.15 J/cm2 graphene is absent but some residuals of graphitic material are still attached to the surface, as in spot B; at lower fluences (c) intact areas are clearly visible within the irradiated region. Circled points A, B, C are picked from the map and their spectra are reported in (d). For details about spectra see the main text. In (e) three different normalized spectra of the G area of type 1 sample, representing the intrinsic variability of CVD single layer graphene used.
