6533b857fe1ef96bd12b43bc

RESEARCH PRODUCT

Interaction between nitroxyl radicals and CdTe quantum dots: Determination of fluorescence-quenching mechanisms in aqueous solution

Víctor RojasJavier RománEduardo MuñozRicardo CórdovaEmilio Alonso NavarreteRicardo SchreblerRodrigo HenríquezJulia Pérez-prietoPaula Grez

subject

Aqueous solutionAqueous mediumChemistryGeneral Chemical EngineeringRadicalGeneral Physics and AstronomyNanoparticle02 engineering and technologyGeneral Chemistry010402 general chemistry021001 nanoscience & nanotechnologyPhotochemistry01 natural sciencesCadmium telluride photovoltaicsFluorescence spectroscopy0104 chemical sciencesNitroxyl radicalsQuantum dot0210 nano-technology

description

Abstract The present work characterizes the optical properties of CdTe quantum dots (CdTe QDs) after interaction with nitroxyl radicals based on steady-state and time-resolved fluorescence spectroscopy studies. QDs of different sizes were exposed to 2 different nitroxyl radicals, i.e., TEMPO and 4-amino-TEMPO radicals. A clear dependence of dynamic and static Stern-Volmer constants values, KD and KS, respectively, was observed as a function of the size of QDs used, with a change from a mostly static mechanism (for smaller QD sizes) to a dynamic mechanism predominating as the nanoparticles increase in size. All observed effects are dependent on both the concentration of the radical and the size of the nanoparticles. These results allow causal relationships to be established that could be used as a basis for the design of a potential sensor for this type of reactive species in aqueous media.

yearjournalcountryeditionlanguage
2019-10-01Journal of Photochemistry and Photobiology A: Chemistry
https://doi.org/10.1016/j.jphotochem.2019.112024