title: Fluorescent Polyelectrolyte Capped Silver Nanoclusters: Optimization and Spectroscopic Evaluation.
abstract: In the present work, we have synthesized water soluble Ag nanoclusters using PMAA as a template with different Ag+: COO-ratios, to optimize it for highest brightness using less UV exposure time. Fluorescence polarization was 0.30 for and was found to vary with excitation and emission wavelength with few hundred picoseconds average fluorescence lifetime. Fluorescence Correlation Spectroscopy data depicts slower diffusion at red excitation compared to blue excitation in confocal volume than conventionally synthesized colloids proving presence of multiple sizes. The optical properties of the particles are dependent upon the excitation wavelength used and the emission wavelength collected.
authors.affiliation: Center for Commercialization of Fluorescence Technologies, University of North Texas Health Science Center, 3500 Camp Bowie Blvd. Fort Worth, Texas, USA, 76107.
authors.forename: Sangram
authors.initials: S
authors.lastname: Raut
authors.forename: Ryan
authors.initials: R
authors.lastname: Rich
authors.forename: Irina
authors.initials: I
authors.lastname: Akopova
authors.forename: Erling
authors.initials: E
authors.lastname: Thyrhaug
authors.forename: Tanya
authors.initials: T
authors.lastname: Shtoyko
authors.forename: Dimytro
authors.initials: D
authors.lastname: Shumilov
authors.forename: Zygmunt
authors.initials: Z
authors.lastname: Gryczynski
authors.forename: Ignacy
authors.initials: I
authors.lastname: Gryczynski
keywords: FCS; Fluorescent Ag Nanoclusters; Metal Nanoclusters; Polarization; Polymethylacrylic Acid