Ultrabright supramolecular beacons based on the self-assembly of two-photon chromophores on metal nanoparticles |
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Authors: | Stellacci Francesco Bauer Christina A Meyer-Friedrichsen Timo Wenseleers Wim Marder Seth R Perry Joseph W |
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Institution: | Department of Chemistry, University of Arizona, Tucson 85721-0041, USA. |
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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. |
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