Metal-enhanced fluorescence (MEF) effect based on silver nanoparticles with different UV spectra on a surface carbon dot-based novel dry platform

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2024-12, Vol.322, p.124744, Article 124744
• Main Authors: An, Jia, Hu, Nan, Yin, Chengyue, Liu, Yufei
• Format: Article
• Language: English
• Subjects: Fluorescence analysis; Glass slide-AgNPs and carbon dots; Metal enhanced fluorescence
• ISSN: 1386-1425
• DOI: 10.1016/j.saa.2024.124744

[Display omitted] •A novel metal-enhanced fluorescence system was constructed based on silver island film and carbon dots.•The metal-enhanced fluorescence system exhibits a 31.72-fold fluorescence enhancement.•Possible mechanisms of fluorescence enhancement have also been systematically investigated. In this work, to enhance the fluorescence quantum yield of carbon dots (CDs), a novel metal-enhanced fluorescence (MEF) structure was designed by decorating CDs on silver nanoparticle (AgNPs) film. The glass slide-AgNPs (GS-AgNPs) structure was fabricated using the electrostatic adsorption method, and the AgNPs-CDs structures were prepared by the direct drying method, which then formed the GS-AgNPs-CDs composite structure. In this structure, the MEF effect was found to be size dependent by changing the 5 types of AgNPs with different sizes. And the MEF effect also decreased as the distance between the AgNPs and CDs increased by using polyvinylpyrrolidone (PVP) to separate the AgNPs and CDs. This hybrid structure can be used as a fluorescence detection platform and the recorded fluorescence intensity of GS-AgNPs 428 nm-CDs achieved a maximum enhancement factor (EF) of 31.72. Considering the high enhancement factor, this system may become promising to find potential applications in biochemical assay fields.