title: Water-soluble Ag nanoclusters exhibit strong two-photon-induced fluorescence.
abstract: Water-soluble ssDNA-encapsulated Ag clusters exhibit large two-photon cross sections reaching 50 000 GM, with high quantum yields in the red and near-IR. Three distinct, spectrally pure, several atom clusters emitting at 660, 680, or 710 nm have been created with two-photon cross sections rivaling those of much larger water-soluble semiconductor quantum dots. Their stability, biocompatibility, and small size offer the promise of nontoxic, sensitive high-resolution biological imaging.
authors.affiliation: School of Chemistry and Biochemistry and Petit Institute of Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA.
authors.forename: Sandeep A
authors.initials: SA
authors.lastname: Patel
authors.forename: Chris I
authors.initials: CI
authors.lastname: Richards
authors.forename: Jung-Cheng
authors.initials: JC
authors.lastname: Hsiang
authors.forename: Robert M
authors.initials: RM
authors.lastname: Dickson
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry; D004277:DNA, Single-Stranded / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D017785:Photons; D011789:Quantum Theory; D012834:Silver / Q000737:chemistry*; D012995:Solubility; D013050:Spectrometry, Fluorescence; D014867:Water / Q000737:chemistry
chemical_list: D001672:Biocompatible Materials; D004277:DNA, Single-Stranded; D005456:Fluorescent Dyes; D014867:Water; D012834:Silver