Broadband Spectroscopic Thermoacoustic Characterization of Single-Walled Carbon Nanotubes

Figure 4

(a) Average TA signal from semiconducting SWNTs, metallic SWNTs, and deionized water. The semiconducting and metallic SWNT solutions had respective slopes of 1.75 AU/GHz () and 2.8 AU/GHz (), with respect to the water baseline (i.e.,  AU/GHz, ); for all three samples. (b) Cross-sectional image of the slope of the TA signal, as a function of microwave excitation frequency, as calculated from the pixel-wise least-squares best-fit line. Tube cross-sections are outlined by dashed gray circles.

(a)

(b)