Broadband Spectroscopic Thermoacoustic Characterization of Single-Walled Carbon Nanotubes

Figure 3

Spectroscopic TA cross-sectional images of semiconducting SWNTs (left tube), metallic SWNTs (middle tube), and deionized water (right tube), acquired with excitation frequencies between 7 and 9 GHz ( GHz). Tube walls are outlined by gray circles in bottom image. A strong spectral dependence is observed for each sample. Dynamic range is 30 dB for all, scale bar = 2 mm.