UV–vis spectra of Ag nanoparticles, PANI, and PANI/Ag nanocomposites. UV–vis absorption spectra were measured in 250–800-nm ranges. The spectra show Ag nanoparticles (a), PANI (b), and PANI/Ag nanocomposites (c)
UV–vis absorption spectra of Ag, PANI, and PANI/Ag
nanocomposites have been shown in Fig. 3.
The absorption spectra of Ag showed the characteristic peak at
∼405 nm, indicating that the Ag nanoparticles and the pure
polyaniline exhibited two characteristic at ∼340 and ∼630 nm,
which are associated with π–π*and n–π*
transitions of polyaniline, respectively (Fig. 3a, b).
The absorption spectra of pure PANI and PANI/Ag nanocomposites
depicted a broad intense peak in the range of 500–750 nm with
maxima at ∼630 nm, indicating the presence of polyaniline on
the surface and having some interaction with silver nanoparticles
(Fig. 3c). .
UV–visible spectroscopic study showed that the maximum absorbance
peak of pure silver was at ∼405 nm, which decreased remarkably
in the presence of PANI (Fig. 3).
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