title: Dye-concentrated organically modified silica nanoparticles as a ratiometric fluorescent pH probe by one- and two-photon excitation.
abstract: Basic dye-concentrated nanoparticles (approximately 33 nm in diameter) show fluorescence-based ratiometric pH response, by one- and two-photon excitations, with improved proton sensing ability (pKa approximately 6.4) through nanoscopic intraparticle energy transfer.
authors.affiliation: Institute for Lasers, Photonics and Biophotonics, Department of Chemistry, State University of New York, Buffalo, New York 14260-3000, USA.
authors.forename: Sehoon
authors.initials: S
authors.lastname: Kim
authors.forename: Haridas E
authors.initials: HE
authors.lastname: Pudavar
authors.forename: Paras N
authors.initials: PN
authors.lastname: Prasad
mesh_terms: D004396:Coloring Agents; D005453:Fluorescence; D005456:Fluorescent Dyes; D006863:Hydrogen-Ion Concentration; D015336:Molecular Probe Techniques; D049329:Nanostructures; D036103:Nanotechnology; D017785:Photons; D011874:Radiometry; D012822:Silicon Dioxide / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
chemical_list: D004396:Coloring Agents; D005456:Fluorescent Dyes; D012822:Silicon Dioxide