Figure 5.

Spectra obtained (6 accumulations of 10 s) at the limit of detections, for the CNT 2 tube of the Figure 3; (a,b) G and G’ bands of CNT 2 without gold excited at 514.53 nm, for a significant focused power of 25 mW, on around 1 µm²; (c,d) the Raman signals at the detection threshold of CNT 2 dressed with two gold particles on each side, recorded with an incident laser power of 25 µW, i.e., 1000 times lower than in the previous conditions.