title: Voltage-gated metal-enhanced fluorescence II: Effects of fluorophore concentration on the magnitude of the gated-current.
abstract: In this letter we report further findings on the ability of an applied direct current to modulate Metal-Enhanced Fluorescence (MEF). Fluorophores in close-proximity to just-continuous silver films (JCS) show significantly enhanced fluorescence intensities. However, when a current is applied to the films, the enhanced fluorescence can be gated in a manner that depends on both the fluorophore concentration, the magnitude of the applied current and the extent of the protein mono to multi-layer surface coverage. Our results are consistent and indeed further support our previous hypothesis and model that fluorophore-metal near-field interactions can be influenced by an applied direct current.
authors.affiliation: Institute of Fluorescence, Laboratory for Advanced Medical Plasmonics, Medical Biotechnology Center, University of Maryland Biotechnology Institute, 725 West Lombard St, Baltimore, MD 21201, USA.
authors.forename: Anatoliy I
authors.initials: AI
authors.lastname: Dragan
authors.forename: Yongxia
authors.initials: Y
authors.lastname: Zhang
authors.forename: Chris D
authors.initials: CD
authors.lastname: Geddes
mesh_terms: D004560:Electricity; D055664:Electrochemical Techniques; D005453:Fluorescence; D008670:Metals / Q000737:chemistry; D013499:Surface Properties
chemical_list: D008670:Metals