title: Enhanced luminescence of phenyl-phenanthridine dye on aggregated small silver nanoparticles.
abstract: Tiopronin-coated silver particles (average diameters of core = 1.6 nm) were prepared by a modified Brust method, and the ligands on the metal core were partially displaced by (2-mercapto-propionylamino) acetic acid-2,5-dioxo-pyrrolidin-1-ylester through ligand exchanges. The particles were bound on amine-pendent polymer backbones by condensation to generate compact aggregates of particles. The aggregated particles displayed a plasmon absorbance rising at 440 nm. Luminescence was enhanced to about 2 times with increasing the plasmon rising by the particle aggregation upon excitation at 400 nm when the polymer was labeled by 3,8-diamino-6-phenyl-phenanthridine.
authors.affiliation: Center for Fluorescence Spectroscopy, University of Maryland School of Medicine, Department of Biochemistry, 725 West Lombard Street, Baltimore, Maryland 21201, USA.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.forename: Joseph R
authors.initials: JR
authors.lastname: Lakowicz
mesh_terms: D049449:Luminescence; D053768:Metal Nanoparticles; D046529:Microscopy, Electron, Transmission; D010617:Phenanthridines / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*
chemical_list: D010617:Phenanthridines; C520045:phenyl-phenanthridine; D012834:Silver