title: Fluorescence ratiometric properties induced by nanoparticle plasmonics and nanoscale dye dynamics.
abstract: Nanoscale transport of merocyanine 540 within/near the plasmon field of gold nanoparticles was recognized as an effective inducer of single-excitation dual-emission ratiometric properties. With a high concentration of the signal transducer (ammonium), a 700% increase in fluorescence was observed at the new red-shifted emission maximum, compared to a nanoparticle free sensor membrane. A previously nonrecognized isosbestic point is demonstrated at 581.4 ± 0.1 nm. The mechanism can be utilized for enhanced and simplified ratiometric optical chemical sensors and potentially for thin film engineering to make solar cells more effective and stable by a broader and more regulated absorption.
authors.affiliation: Department of Chemistry and Molecular Biology, University of Gothenburg, Kemivägen 10, 412 96 Gothenburg, Sweden. hakonen@chem.gu.se
authors.forename: Aron
authors.initials: A
authors.lastname: Hakonen
mesh_terms: D005456:Fluorescent Dyes / Q000032:analysis / Q000737:chemistry; D008422:Materials Testing; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D011744:Pyrimidinones / Q000032:analysis* / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D005456:Fluorescent Dyes; D011744:Pyrimidinones; C003954:merocyanine dye