title: Single molecule spectroscopy of organic dye nanoparticles.
abstract: Organic dye nanoparticles 1-13 nm in height and 10-45 nm in width were prepared by the reprecipitation method. With single-molecule/nanoparticle spectroscopy, two distinct types of nanoparticles were found: particles with blue emission and particles with red emission. The difference in spectral characteristics is attributed to the presence of two morphological types of particles in the samples. The presence of two types of nanoparticles in the samples was further corroborated by our ability to separate blue nanoparticles from red nanoparticles by centrifugation.
authors.affiliation: Center for Nano- and Molecular Science and Technology, Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas 78712, USA.
authors.forename: Andre J
authors.initials: AJ
authors.lastname: Gesquiere
authors.forename: Takayuki
authors.initials: T
authors.lastname: Uwada
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Asahi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Masuhara
authors.forename: Paul F
authors.initials: PF
authors.lastname: Barbara
mesh_terms: D005456:Fluorescent Dyes / Q000032:analysis* / Q000737:chemistry*; D008422:Materials Testing / Q000379:methods*; D043942:Nanotubes / Q000032:analysis* / Q000737:chemistry*; D009930:Organic Chemicals / Q000032:analysis / Q000737:chemistry*; D010316:Particle Size; D013050:Spectrometry, Fluorescence / Q000379:methods*
chemical_list: D005456:Fluorescent Dyes; D009930:Organic Chemicals