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

Abstract

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 (NaBH 4). 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.

Enhancing the structural, thermal, and dielectric properties of the polymer nanocomposites based on polymer blend and barium titanate nanoparticles for application in energy storage

“…CH 2 rocking, C═O stretching, and CH 2 antisymmetric stretching of the PVA‐PVP blend have been attributed to the bands at 852, 1736, and 2942 cm −1. 24 The C‐H rocking, CH bending owing to alkane/alkene, and C═O stretching of PVP were related to the detected absorption bands at 840, 1272, 1426, 1659, and 3524 cm −1 , respectively. The peak of PVA is assigned to the C═O stretching vibration of the acetate group at 1736 cm −1 , and this is regarded as the residual portion of PVA 25 .…”

Recent Progress on Fabrication and Performance of Polymer Composites with Highly Thermal Conductivity

“…Up to date, several potentially materials, such as carbon materials, ceramics, and metal are commonly considered ideal candidates used for highly thermally conductive composite due to their thermal conductivity. Metal fillers, such as Al, [11] Cu, [12] Ag, [13] and so on are often used in fields without the need of electrical insulation due to brilliant electrical conductivity and thermal conductivity. Wang et al prepared well dispersed single crystal copper nanowires (CuNW) with large aspect ratio using as fillers in acrylate matrix.…”

Boosting optical and electrical characteristics of polyvinyl alcohol/carboxymethyl cellulose nanocomposites by GNPs / MWCNTs fillers as an application in energy storage devices

“…This polarization near the electrodes is consistent with the system's non-Debye type nature. 40 Invariance may perform as the materials' energy barrier because of the applied electric field. At low frequencies, the highest dielectric constant is given by the ions hopping in the applied field's energy barrier.…”