Abstract:
This thesis reports the synthesis of an easy, environmentally friendly, and cost effective
polyol method for the synthesis of copper nanoparticles and copper/poly (vinyl chlorideco-
vinyl acetate-co- vinyl alcohol) nanocomposite films using solution casting
technique. Face centered cubic structured nanoparticles, space group Fm-3m (225) with
average crystallite size of 33.5 nm were successfully prepared with characteristics
diffraction peaks at 2𝜃= 43.3, 50.5, 73.2° as investigated by XPRD. FTIR also shows
characteristics band of Cu-PVP hybrid evident in nanoparticles at 1089 and 629 cm-1
which further confirm the synthesis of copper nanoparticles.
Polymeric nanocomposite thin films of 5, 10, 15, 20 and 25 % wt were prepared.
Polymer show characteristics broad peak ranging from 10-30°. Spherical nanoparticles
were seen to be homogenously dispersed in polymer matrix as investigated by Field
emission electron spectroscopy (FESEM). Dispersed nanoparticles in the film possess
average size of ~68.67 nm. The improved dielectric constants of nanocomposites was as
high as 3.75 at 25 % wt. The insulating effect of PVP, coating the copper nanoparticles
along with interfacial polarization results in very low value of dielectric loss ranging
from 0.08 to 0.16 with tangent loss values at 0.0025 to 0.0054 and range of value of AC
conductivity is 0.4⨯10-6 to 1.2⨯10-5 S/m at weight percentage from 5 to 25 of polymeric
nanocomposite film which make these nanocomposites films a promising material for
used in charge storage applications.
