Search results for "ratiometric"

showing 3 items of 3 documents

Selective and Sensitive Chromofluorogenic Detection of the Sulfite Anion in Water Using Hydrophobic Hybrid Organic-Inorganic Silica Nanoparticles

2013

[EN] In water and wine: Chromofluorogenic detection of the sulfite anion in pure water was accomplished by using a new hybrid organic-inorganic material that contained a probe entrapped in hydrophobic biomimetic cavities. This material was used for the detection of sulfite in red wine. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

INGENIERIA DE LA CONSTRUCCIONOrganic-inorganic hybrid materialsInorganic chemistryWineSO2Electrochemical detectionMesoporous nanoparticlesCatalysisSilica nanoparticleschemistry.chemical_compoundQUIMICA ORGANICASulfiteQUIMICA ANALITICAOrganic inorganicAsthmatic-patientsElectrochemical detectionAsthmatic patientSpectrophotometric methodSensorsFood analysisBisulfiteQUIMICA INORGANICAGeneral ChemistryGeneral MedicineDerivatizationFoodschemistrySulfiteRatiometric fluorescent-probeCapillary electrophoretic determinationNuclear chemistryAngewandte Chemie
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Nitrogen-doped carbon dots embedded in a SiO2 monolith for solid-state fluorescent detection of Cu2+ ions

2017

We describe the simple fabrication of SiO2 sol-gel monoliths embedding highly luminescent carbon nanodots (CDs) sensitive to metal ions. The pristine CDs we synthesize display an intense dual emission consisting in two fluorescence bands in the green and violet region, and we demonstrate that this photoluminescence is substantially unchanged when the dots are incorporated in the SiO2 matrix. The emission of these CDs is quenched by interactions with Cu2+ ions, which can be used to detect these ions with a detection limit of 1 μM. The chromophores remain accessible to diffusing Cu2+ ions even after embedding CDs in the sol-gel monolith, where their detection capabilities are preserved. Such …

PhotoluminescenceMaterials scienceAtomic and Molecular Physics and OpticMetal ions in aqueous solutionAnalytical chemistryBioengineering02 engineering and technology010402 general chemistryPhotochemistry01 natural sciencesFunctional materialIonPhase (matter)General Materials ScienceMonolithPhotoluminescenceRatiometric sensorSensorgeographygeography.geographical_feature_categoryChemistry (all)General ChemistryChromophore021001 nanoscience & nanotechnologyCondensed Matter PhysicsFluorescenceCarbon dotAtomic and Molecular Physics and Optics0104 chemical sciencesModeling and SimulationMaterials Science (all)0210 nano-technologyLuminescence
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Pyrene-Capped CdSe@ZnS Nanoparticles as Sensitive Flexible Oxygen Sensors in Non-Aqueous Media**

2014

A flexible, highly sensitive sensor of oxygen in non-aqueous solvents is described. It consists of CdSe/ZnS nanoparticles decorated with a considerable number of pyrene units, thus making the formation of the pyrene excimer possible. The emission of the pyrene excimer and that of the nanoparticle are suitably separated from each other and also from the excitation wavelength. This sensor can be applied as a ratiometric oxygen sensor by using the linear response of the pyrene excimer lifetime combined with the linear response of the nanoparticle excited state lifetime. This nanohybrid has been assayed in seven media with different dielectric constants and viscosities over the whole oxygen con…

chemistry.chemical_elementNanoparticleNanotechnologyGeneral ChemistryDielectricFull PapersratiometricPhotochemistryExcimersensorsOxygennanohybridschemistry.chemical_compoundchemistryExcited statePyreneLimiting oxygen concentrationorganic solventsOxygen sensoroxygenChemistryOpen
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