Affiliation:
1. Department of Physics “E. Pancini” University of Naples Federico II Via Cintia 26 Napoli 80126 Italy
2. Department of Experimental Medicine University of Campania Luigi Vanvitelli Via de Crecchio 7 Napoli 80138 Italy
3. Institute for Superconducting Oxides and other Innovative Materials and Devices of the National Research Council (CNR‐SPIN) Piazzale V. Tecchio 80 Napoli 80125 Italy
Abstract
AbstractMagneto‐plasmonic particles, comprising gold and iron oxide, exhibit substantial potential for biosensing applications due to their distinct properties. Gold nanoparticles (AuNPs) provide plasmonic features, while iron oxide composites, responsive to an external magnetic field, significantly reduce detection time compared to passive diffusion. This study explores core@satellite magneto‐plasmonic particles (CSMPs), featuring magnetic nanoparticle clusters and numerous satellite‐like AuNPs, to amplify the optical response on a nanostructured gold surface. Using a sandwich scheme, target analytes are detected as hybrid nanoparticles bind to the pre‐immobilized target on the AuNPs surface, inducing changes in the immunosensor's extinction spectrum. Application of an external magnetic field notably enhances biosensor response and sensitivity, reducing assay time from hours to minutes. Leveraging the properties of CSMPs, the immunosensor detects specific immune protein at low concentrations within minutes. CSMPs hold considerable promise for precise and sensitive analyte detection, offering potential applications in rapid testing and mass screening.