Development of a Novel Electrochemical Sensor Based on Gold Nanoparticle-Modified Carbon-Paste Electrode for the Detection of Congo Red Dye.
Aisha A GanashSahar AlshammariEntesar Ali GanashPublished in: Molecules (Basel, Switzerland) (2022)
In this study, gold nanoparticles (AuNPs) were electrodeposited on samples of a carbon-paste electrode (CPE) with different thicknesses. The prepared AuNPs were characterized using different analysis techniques, such as FTIR, UV-Vis, SEM, EDX, TEM images, and XRD analysis. The fabricated modified electrode AuNPs/CPE was used for the sensitive detection of Congo red (CR) dye. Electrochemical sensing was conducted using square-wave voltammetry (SWV) in a 0.1 M acetate buffer solution at pH 6.5. The proposed sensor exhibited high efficiency for the electrochemical determination of CR dye with high selectivity and sensitivity and a low detection limit of 0.07 μM in the concentration range of 1-30 μM and 0.7 μM in the concentration range of 50-200 μM. The practical application of the AuNPs/CPE was verified by detecting CR dye in various real samples involving jelly, candy, wastewater, and tap water. The calculated recoveries (88-106%) were within the acceptable range.
Keyphrases
- gold nanoparticles
- molecularly imprinted
- label free
- sensitive detection
- loop mediated isothermal amplification
- high efficiency
- highly efficient
- ionic liquid
- carbon nanotubes
- solid phase extraction
- solid state
- optical coherence tomography
- wastewater treatment
- convolutional neural network
- mesenchymal stem cells
- machine learning
- mass spectrometry
- visible light