Dye-concentrated organically modified silica nanoparticles as a ratiometric fluorescent pH probe by one- and two-photon excitation.
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.
Kim
Sehoon
S
Institute for Lasers, Photonics and Biophotonics, Department of Chemistry, State University of New York, Buffalo, New York 14260-3000, USA.
Pudavar
Haridas E
HE
Prasad
Paras N
PN
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
D004396:Coloring Agents; D005456:Fluorescent Dyes; D012822:Silicon Dioxide