Structural, thermal, optical and conductive properties of PAM/PVA polymer composite doped with Ag nanoparticles for electrochemical application

In the present study, the chemical preparation of silver nanoparticles (Ag NPs) solution was achieved by decreasing silver salt via the use of sodium borohydride (NaBH₄). The particles appeared to have a crystalline nature through the XRD study, with a face-centered cubic (FCC) structure. The formation of silver nanoparticles (Ag NPs) was asserted by the UV, XRD and TEM. An absorption peak at around 430 nm was demonstrated through UV–visible spectrum of the aqueous medium which related to of Ag NPs. The solution casting method was used to prepare new nanocomposites films on the bases of polymer blend which related to of PAM- and PVA-doped with different wt% of Ag NPs. Various analytical techniques were used to characterize the prepared films. It was confirmed through the XRD analysis that there existed a complex formation between polymer blend and Ag NPs. A reduction in the value of the optical bandgap was displayed by UV–Vis with an increase in the concentration of Ag NPs. It was shown through the FTIR spectrum that there existed changes in the FTIR spectrum with dopant concentration indicating the interaction of dopant with the polymer blend. A great improvement in the thermal stability of the composites was proved through the TGA study with the loading of Ag NPs. The ionic conductivity at room temperature was improved by the doping of Ag NPs ions into the polymer blend system. This is attributed to the increase in mobile charge carriers and their mobility. The dielectric values in the studied frequency range indicate a strong dielectric dispersion which increases as the content of the Ag NPs increases. Consequently, these films can be suggested as a suitable application in optical devices and dielectric applications due to the observed improvement in optical properties and ac conductivity.