Conductive Polymer Nanocomposites for Flexible Electronics and Energy Storage Devices

https://doi.org/10.5281/zenodo.19890570

Abstract

The search for conductive polymer nanocomposites (CPNCs), which combine the flexibility of polymers with the improved functional qualities of nanofillers, has accelerated due to the need for next-generation flexible electronics and high-performance energy storage systems.  The development of CPNCs for wearable sensors, flexible supercapacitors, stretchable devices, and solid-state batteries from 2020 to 2025 is comprehensively reviewed in this article.

Incorporating nanofillers such as graphene, carbon nanotubes (CNTs), MXenes, and metal oxides into intrinsically conductive polymers (ICPs) like PEDOT: PSS, polyaniline (PANI), and polypyrrole (PPy) results in significant improvements in their mechanical flexibility (strain tolerance >150%) and electrical conductivity (up to 800 S/cm).  For example, adding just 5 weight percent of rGO to a PVA matrix increased the ionic conductivity from 1.2 × 10⁻⁵ S/cm to 3.5 × 10⁻³ S/cm, representing a 290-fold increase and making it suitable for Li-ion battery applications (Ezzat et al., 2025).  Similarly, a ternary nanocomposite of PVA/SnO₂–SiC outperformed traditional dielectric polymers by 4×, achieving a dielectric constant of εr ≈ 145 at 1 kHz (Kareem & Habeeb, 2025).

With PEDOT–Chitin nanocomposites-based supercapacitors reaching a specific capacitance of 350 F/g and retaining 94% of their capacity after 5,000 cycles, energy storage performance also significantly improved (Gharsallah et al., 2025).  The durability of flexible devices made with these nanocomposites was ensured in wearable applications by their consistent performance even when subjected to stretching cycles exceeding 10,000 times and bending radii of less than 5 mm.

Additionally, the review highlights design approaches that have produced multifunctional materials with combined electrical, thermal, and magnetic properties, such as beam-induced structuring, nano-tin crosslinking, and hybrid filler architectures (Shueb et al., 2025; Alruqi et al., 2025).  Furthermore, machine learning methods have become effective instruments for forecasting the relationships between structure and properties in these nanocomposites, reducing development times and directing the optimization of materials (Thomas et al., 2025).

The scalability of environmentally friendly synthesis techniques, filler-polymer interface degradation under high strain, and poor filler dispersion at >10 weight percent are still major obstacles in spite of these advancements.  For commercial translation, it is essential to address these constraints using bio-derived polymers, green chemistry, and sophisticated computational models.

In conclusion, CPNCs have developed into a fundamental class of materials for new flexible and environmentally friendly electronic devices.  The field is positioned for significant advancements, with related research publications showing a compound annual growth rate (CAGR) of approximately 14% between 2020 and 2025.  In order to provide a roadmap for materials scientists, device engineers, and energy technologists who want to create the next generation of high-performance, flexible, and multipurpose systems, this review compiles important findings from more than 150 studies.