title: Hyper-efficient quenching of a conjugated polyelectrolyte by dye-doped silica nanoparticles: better quenching in the nonaggregated state.
abstract: We investigated the quenching properties of poly(phenylene ethynylene) with anionic alkoxyl sulfonate side groups, PPE-SO3, by tris(2,2-bipyridyl)dichlororuthenium(II) (Rubpy)-doped silica nanoparticles (SiNPs) in water, methanol, and the surfactant Triton X-100 aqueous solution. SiNPs demonstrated hyper-efficient quenching characterized by the Stern-Volmer constants in the range of 10(9)-10(10) M(-1), which is about 100-10,000 times more efficient compared to the Rubpy dye. More importantly, quenching by SiNPs was found to be more efficient when the polymer existed as a nonaggregated state, such as in methanol solution and in the surfactant solution. Investigations on confocal fluorescence images and time-resolved fluorescence decays were carried out to study the quenching mechanism.
authors.affiliation: Guangdong Province Key Laboratory of Chemical Biology, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, PR China.
authors.forename: Chunyan
authors.initials: C
authors.lastname: Tan
authors.forename: Yonghua
authors.initials: Y
authors.lastname: Xie
authors.forename: Xiaoxiao
authors.initials: X
authors.lastname: He
authors.forename: Kemin
authors.initials: K
authors.lastname: Wang
authors.forename: Yuyang
authors.initials: Y
authors.lastname: Jiang
mesh_terms: D000042:Absorption; D004396:Coloring Agents / Q000737:chemistry*; D004573:Electrolytes / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013057:Spectrum Analysis; D013501:Surface-Active Agents / Q000737:chemistry
chemical_list: D004396:Coloring Agents; D004573:Electrolytes; D011108:Polymers; D012997:Solvents; D013501:Surface-Active Agents; D012822:Silicon Dioxide