Voltammetric determination of ethinylestradiol using screen-printed electrode modified with functionalized graphene, graphene quantum dots and magnetic nanoparticles coated with molecularly imprinted polymers

Molecularly imprinted electrochemical aptasensor based on functionalized graphene and nitrogen-doped carbon quantum dots for trace cortisol assay

“…Finally, it was dried in an oven at 100 °C. 29 The N–CQDs–FG composite material was prepared by mixing 1 mg of FG with 1 mL of N–CQDs solution and then sonicating for 30 min.…”

“…Therefore, the combination of graphene and carbon quantum dots can form a three-dimensional electron transmission channel on the electrode surface, which accelerates electron transmission rates, increase active sites and improve the detection sensitivity. 28,29…”

Graphene Quantum Dots by Eco-Friendly Green Synthesis for Electrochemical Sensing: Recent Advances and Future Perspectives

“…The electrode response to ethinyl-estradiol detection was studied by voltametric analysis, providing a linear range from 1.0 × 10 −2 to 2.5 μmol L −1 . Moreover, electrochemical study of the electrode (mag@MIP)-GQDs-FG-NF/SPE) showed an increase in signal in the presence of ethinyl-estradiol without being affected by interference from other substances, allowing the use of the sensor for analysis on real samples [ 113 ]. Thus, in 2016 Xuan Jian et al developed a modified glassy carbon electrode (GQDs/GCE) for the detection of hydroquinone (HY) and catechol (CA) in water, demonstrating how GQDs, synthesized from citric acid, could represent an excellent alternative for the construction of electrochemical sensors [ 114 ].GQDs/graphene/GCE has been successfully employed for the determination of Cu(II) in water, by differential pulse anodic voltametric analysis (DPASV), the authors inferring that combining GQDs with graphene allows a material able to enhance the electron movement, favoring the redox reaction on the electrode and showing a good sensitivity for copper (20.314 μA μM −1 ) and a good selectivity (error tolerance limit < ±5%) [ 115 ].…”

Portable Electrochemical Sensing of Indole‐3‐acetic Acid Based on Self‐assembled MXene and Multi‐walled Carbon Nanotubes Composite Modified Screen‐printed Electrode

“…Hernández-Saravia et al [26] fabricated a copper-nanoporous gold structure anchored SPE to examine the electrochemical behavior of glucose. Santos et al [27] developed a new method for ethinylestradiol detection with functionalized graphene and graphene quantum dots modified SPE. Besides, SPE can be combined with simple and portable electrochemical devices using various electrochemical methods to achieve a rapid detection and on-site in-situ testing.…”