Advances in carbon nanomaterials and their polymeric composites in neural tissue engineering

Carbon-based nanomaterials (CBMs) and their polymeric composites have garnered widespread interest in treating neurotrauma and neurodegenerative diseases, where restoring damaged central and peripheral nervous systems remains a persistent clinical challenge. These materials provide exceptional electrical conductivity, mechanical robustness, and tunable nanoscale architectures conducive to guiding neuronal growth, synaptic connectivity, and targeted biomolecule delivery. In this review, we explore the rationale, recent advances, and translational potential of CBM scaffolds in promoting neuronal survival, neurite outgrowth, and functional maturity across various experimental models. We detail key fabrication strategies, including electrospinning, phase inversion, 3D bioprinting, and pyrolysis that enable precise control over scaffolds' structural and mechanical properties while facilitating the incorporation of neurotrophic factors, genes, and therapeutic drugs. Emerging in vivo findings suggest that CBM nanocomposites promote regenerative outcomes in peripheral nerve injuries at levels comparable to, or exceeding conventional autografts, underscoring their promise as off-the-shelf solutions. Nonetheless, concerns persist regarding large-scale manufacturing, cytotoxicity, and meeting regulatory standards for clinical use. By highlighting cutting-edge innovations and remaining bottlenecks, this review aims to guide future research endeavors in harnessing CBM scaffolds for safe and effective neural tissue repair.