title: Ultrabright supramolecular beacons based on the self-assembly of two-photon chromophores on metal nanoparticles.
abstract: Silver nanoparticles coated with a self-assembled layer of approximately 2500 chromophoric alkylthiol ligands, that exhibit a huge per particle two-photon absorption cross section (2.7 x 10-45 cm4 s photon-1) and a high fluorescence quantum yield (0.33), are reported. Polyfunctionalized variants of these nanoparticles have been produced that show reasonable solubility in water/ethanol mixtures. By virtue of the large number of tethered chromophores, these particles act as strongly two-photon absorbing nanobeacons and may have applications in fluorescence imaging and sensing.
authors.affiliation: Department of Chemistry, University of Arizona, Tucson 85721-0041, USA.
authors.forename: Francesco
authors.initials: F
authors.lastname: Stellacci
authors.forename: Christina A
authors.initials: CA
authors.lastname: Bauer
authors.forename: Timo
authors.initials: T
authors.lastname: Meyer-Friedrichsen
authors.forename: Wim
authors.initials: W
authors.lastname: Wenseleers
authors.forename: Seth R
authors.initials: SR
authors.lastname: Marder
authors.forename: Joseph W
authors.initials: JW
authors.lastname: Perry
mesh_terms: D015502:Absorptiometry, Photon / Q000379:methods*; D036103:Nanotechnology / Q000379:methods*; D009578:Nitrobenzenes / Q000737:chemistry*; D017785:Photons; D012834:Silver / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013055:Spectrophotometry, Infrared; D013267:Stilbenes / Q000737:chemistry*
chemical_list: C472025:4-(11-mercaptoundecoxy)-2,5-bis(4-nitrophenylvinyl)anisole; D009578:Nitrobenzenes; D013267:Stilbenes; D012834:Silver