Enhanced Thermal Stability of Polymers by Incorporating Novel Surface-Decorated SrTiO3@Graphene Nanoplatelets

Abstract

Polyvinylidene fluoride (PVDF) is a vital component in the manufacturing of flexible dielectric capacitors due to its exceptional electrical insulation properties. However, its thermal stability remains a significant concern. To address this, we have developed a novel approach in which surface-decorated SrTiO₃@Graphene (STO@G) nanoplatelets were prepared using a wet-chemical method. Subsequently, STO@G/PVDF nanocomposite films were synthesized via a solution-casting method using an automatic film coater. X-ray diffraction (XRD) analysis confirmed the presence of the required strontium titanate (SrTiO₃), graphene, and STO@G phases. Further, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDXS) were used to examine the STO@G nanoplatelets' even distribution inside the PVDF polymer, even at higher nanoparticle concentrations (10wt.%), revealing no porosity or morphological defects and demonstrating its potential for flexible dielectric capacitors. Thermogravimetric analysis (TGA) was used to assess the thermal stability of 10wt.% STO@G/PVDF nanocomposite films, demonstrating a positive impact on PVDF's thermal stability. Specifically, the thermal stability of PVDF was enhanced until 170 ^oC. These findings demonstrate that our approach provides a promising strategy to enhance the thermal stability of PVDF for various applications, including energy storage and conversion, sensors, and electronic devices, ultimately improving its reliability and durability by increasing its operational temperature range.