Green synthesized silver nanoparticles and PVA composite films showing enhanced protein adsorption, conductivity and dielectric permittivity: Suitable candidate for electronic and biomedical applications

Cinnamon bark extract (CBE) derived silver nanoparticles (AgNs) and PVA have been used to prepare CBE-PVA-AgNs films by solution casting method. X-Ray diffraction (XRD) studies confirmed the enhancement of crystallinity and silver peaks appeared around 38.12° and 44.41°. Small shift of the silver peak (∼ 2°) in the composite film indicated interaction of AgNs and the PVA. Scanning electron microscope study specified silver grain size varying from 30- 50 nm.The FTIR study approves the complex interaction of the AgNs with the PVA. The UV–visible spectrum showed the presence of silver peak around 430 nm. Enhanced protein adsorption indicated increased biocompatibility of the films which is important for their biomedical applications. Frequency (0.0–10.0 kHz) dependent film conductivity (σ) and dielectric permittivity (ε) also increased largely showing low dielectric loss factor (tan δ < 1.0). The films exhibiting multifunctional properties are suitable for their applications in electronic devices, optoelectronics and packaging industries.