RAMAN APPLICATIONS IN SYNTHETIC AND NATURAL POLYMER FIBERS AND THEIR COMPOSITES - Raman Spectroscopy for Soft Matter Applications - page 81

(a)

4000

2800

G ′ band

2600

251

2400

2200

2000

3000

200 225 250 275 300

Raman wave number (cm -1 )

Isolated
nanofiber

2000

500 1000 1500 2000 2500 3000

Raman wave number (cm -1 )

(b)

2608

2606

2604

2602

G ′ band

2600

0.0 0.1 0.2 0.3 0.4 0.5

Nanofiber strain (%)

Figure 4.12 Polyvinyl alcohol (PVA) nanocomposite nanofi ber reinforced with single
wall carbon nanotubes (SWNTs). (a) Raman spectrum of the nanofi ber with the radial
breathing mode (RBM) inset. (b) Shift of the G ′ band with nanofi ber strain. (Data
replotted from Kannan et al. [120].)

isolated and aligned single wall carbon nanotubes (SWNTs) [120] . The
Raman spectrum of the nanofi ber shows that even though it contains
only 0.04% of SWNTs, the spectrum is dominated by the resonance
Raman scattering from the SWNTs. The single radial breathing mode
at 251 cm − 1 also implies that the nanotubes are debundled and isolated
in the nanofi ber. The shift of the G ′ Raman band of the nanotubes