Hybrid Antibacterial Surfaces: Combining Laser‐Induced Periodic Surface Structures with Polydopamine‐Chitosan‐Silver Nanoparticle Nanocomposite Coating

Abstract Bacterial biofilm‐associated infections are a persistent and growing problem, further exacerbated by the rapid development of antibiotic‐resistant bacterial strains. Antibacterial surfaces hold great potential for controlling the survival, growth, and transmission of bacterial pathogens. This study demonstrates the synergetic integration of laser‐assisted topographical surface modification with coating solutions to simultaneously engage both chemical and nano‐/micro‐topography‐sensitive bacterial attachment mechanisms. The developed mechano‐chemo bactericidal surface combines laser‐induced periodic surface structures (LIPSS) on titanium (Ti) with a polydopamine‐chitosan‐silver nanoparticles (PCA) composite coating. The antibacterial performance of this hybrid surface against Gram‐negative Escherichia coli ( E. coli ) and Gram‐positive Staphylococcus aureus ( S. aureus ) exceeds the benchmark performance achieved by either surface modification approach alone. The hybrid surface demonstrates superior resistance to biofilm formation, offering a viable route for large‐scale production of antimicrobial surfaces with enhanced functionality and superior long‐term performance.