A 2D tungsten disulphide/diamond nanoparticles hybrid for an electrochemical sensor development towards the simultaneous determination of sunset yellow and quinoline yellow
| Autor: | Gary Ellis, L. Sánchez, Lina Hristova, María del Pozo, Luis Vázquez, Carmen Quintana, María Dolores Petit-Domínguez, Elías Blanco, Elena Casero, Rut Martínez-Moro |
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| Přispěvatelé: | Ministerio de Ciencia, Innovación y Universidades (España), Comunidad de Madrid |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Analytical chemistry 02 engineering and technology Glassy carbon 010402 general chemistry 01 natural sciences Sunset yellow Nanomaterials symbols.namesake chemistry.chemical_compound Simultaneous electroanalysis Materials Chemistry Tungsten disulphide Electrical and Electronic Engineering Instrumentation Detection limit Quinoline Diamond nanoparticles Metals and Alloys 021001 nanoscience & nanotechnology Condensed Matter Physics Quinoline yellow 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Dielectric spectroscopy Electrochemical gas sensor chemistry Electrochemical sensor symbols Differential pulse voltammetry 0210 nano-technology Raman spectroscopy |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | We present the development of an electrochemical sensor towards the simultaneous analysis of a mixture of food additives: sunset yellow (SY) and quinoline yellow (QY) dyes. The sensor is based on the synergetic effect observed between diamond nanoparticles (DNPs) and WS nanosheets obtained by liquid exfoliation. The prepared TMDs were characterized using Raman spectroscopy, X-Ray Diffraction (XRD) and Atomic Force Microscopy (AFM). The AFM characterization showed isolated WS flakes with different lateral dimensions scattered over the flat background. The combination of WS and DNPs allows resolution of the oxidation signals of the analytes, which overlap working with the bare glassy carbon (GC) electrode. The best electroanalytical response was obtained with a sensor containing both nanomaterials deposited employing the drop-casting method in a sequential manner, a first layer of WS and a second layer of DNPs (GC/WS/DNPs). Electrochemical impedance spectroscopy experiments showed that for the GC/WS/DNPs system the charge transfer is clearly improved. Under optimized differential pulse voltammetry conditions, the GC/WS/DNPs sensor allows the determination of SY at +100 mV and QY at +850 mV with detection limits of 0.086 and 3.4 μM respectively, with relative errors ≤ 8.40 % and a relative standard deviation ≤ 12.6 %. The proposed methodology was applied to the determination of SY and QY in commercial throat lozenge samples with very good recoveries on average: 93 %, for QY and 106 % for SY. The authors acknowledge financial support from the Spanish MINECO (MAT2017-85089-C2-1-R, MAT2017-85089-C2-2-R) and the Comunidad Autónoma de Madrid (P2018/NMT-4349, TRANSNANOAVANSENS-CM). Authors thank Patricia Reyero from the Interdepartmental Research Service (SIDI) of the Universidad Autónoma de Madrid for the XRD measure |
| Databáze: | OpenAIRE |
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