Electrochemical, spectroscopic and electrochemiluminescent characterization of self-assembled 3-aminopropyltriethoxysilane/CdTe quantum dots hybrids on screen-printed electrodes

dc.creatorGarcía, Camilo
dc.creatorNavarro, Freddy
dc.creatorCelis, Freddy
dc.creatorRuiz, Domingo
dc.creatorToledo, Sofía
dc.creatorSanhueza, Luis
dc.creatorQuiñones, Arturo
dc.creatorAguirre, María J.
dc.date2018
dc.date2019-11-13T16:22:12Z
dc.date2019-11-13T16:22:12Z
dc.date2019-11-13
dc.date.accessioned2021-06-14T22:02:59Z
dc.date.available2021-06-14T22:02:59Z
dc.identifierElectrochimica Acta, Vol.276, N° 64-72, 2018
dc.identifierhttp://repositoriodigital.uct.cl/handle/10925/2080
dc.identifier10.1016/j.electacta.2018.04.147
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/3299364
dc.descriptionThis work describes the electrochemical, spectroscopic and electrochemiluminescent (ECL) characterization of graphite screen-printed electrodes (SPE) modified with a multilayer electrostatic assembly between 3-aminopropyltriethoxysilane (APTES) and CdTe quantum dots stabilized with glutathione (GSH) as the cationic and the negative layers, respectively. The characterization of the obtained system was performed by cyclic voltammetry, electrochemical impedance spectroscopy, scanning electron microscopy and Raman spectroscopy, which confirm the homogeneous presence of CdTe quantum dots on the multilayer assembly. The electrochemiluminescent properties were measured in a potentiostat coupled with a photodiode detector, showing stable and repetitive electrochemiluminescent signals. The ECL response was studied using potassium persulfate and hydrogen peroxide as co-reactants, and the measurements were carried out at different scan rates, pH values and concentrations. The ECL properties of the studied system at specific experimental conditions demonstrated different mechanisms by changing the co-reactants associated with the electrochemical step to generate the radical species and its interaction with the SPE/APTES/CdTe (GSH) reduced system, obtaining a more intense ECL signal with H2O2 than with S2O82-. Some analytical parameters, such as the linear range and the limit of detection for SPE/APTES/CdTe (GSH) in ECL H2O2 detection, were obtained
dc.formatPDF
dc.formatapplication/pdf
dc.languageen
dc.sourceElectrochimica Acta, Vol.276, N° 64-72, 2018
dc.subjectElectrochemiluminescent
dc.subjectElectrochemical
dc.subjectSpectroscopy
dc.titleElectrochemical, spectroscopic and electrochemiluminescent characterization of self-assembled 3-aminopropyltriethoxysilane/CdTe quantum dots hybrids on screen-printed electrodes
dc.typeArtículo de Revista


Este ítem pertenece a la siguiente institución