Evaluation of a Nanocomposite Based on Reduced Graphene Oxide and Gold Nanoparticles as an Electrochemical Platform for Detection of Sulfamethazine

Abstract

A nanocomposite based on reduced graphene oxide (rGO) and gold nanoparticles (AuNPs) was synthesized by the microwave-assisted hydrothermal method and applied in the determination of sulfamethazine (SMZ) in swine effluent using a glassy carbon (GC) electrode. The rGO-AuNPs nanocomposite was characterized morphologically, electrochemically and spectrochemically, showing that rGO was modified with the AuNPs. The GC/rGO-AuNPs electrode was optimized for the determination of SMZ, achieving detection limits of 0.1 μmol L−1. The proposed sensor was successfully applied to the determination of SMZ in synthetic swine effluent samples.

Competitive Host‐guest Electrochemical Detection of Ivermectin Drug Using a β‐Cyclodextrin/Graphene‐based Electrode

“…GO showed two maximum absorption bands at 225 and 307 nm, related to π→π* transition of aromatic C=C bonds and n→π* transition of C=O, respectively. On the other hand, its reduced form (rGO) displayed one absorption band at 254 nm, which indicates that rGO has a higher C/O coefficient, with a decreased amount of carbon‐oxygen based groups and establishment of C=C conjugated graphene structures [25]. Inset of Figure 2A also shows the change of suspension color after the chemical reduction, the GO is yellowish, while the rGO presents a darker color.…”

Principal Component Analysis as a Tool for Electrochemical Characterization of Modified Electrodes: A Case Study

“…For the RGO/ AuNP and RGO/CuNP, the proportion between metallic cation and GO was 40% (w/w) and 30% (w/w), respectively, as previously evaluated. 16,43 Before modification, the GC electrodes were polished with sandpaper (3 M, 3000) and a 0.05 μm alumina suspension until obtaining a smooth and reflective surface. Then, the electrodes were sonicated in ethanol and water, 10 min each, and left to dry at room temperature.…”

A graphene gold nanocomposite-based 5-FU drug and the enhancement of the MCF-7 cell line treatment

“…The mechanism for obtaining the proposed structure of the rGO-Au nanocomposites has been reported in the literature. [44][45][46] In addition, to probe and investigate the mechanism for attaining the anticipated rGO-Au-5-FU nanocomposites, we speculated the formation mechanism of the rGO-Au-5-FU nanocomposites, as illustrated in Fig. 2g.…”

“…(c and d) Gaussian-size distribution of the obtained rGO-Au-5-FU nanoparticle materials as well as the obtained gold particles inside the rGO-Au nanocomposite. TEM image of (e) the prepared graphene oxide, (f) rGO-Au (5%) and (g) the schematic of the proposed rGO-Au nanocomposite showing the vibration of the carbon atoms indicated by arrows and the combination between the rGO-Au composite and 5-FU structure [44][45][46]. 31024 | RSC Adv., 2019, 9, 31021-31029This journal is © The Royal Society of Chemistry 2019 RSC Advances Paper Open Access Article.…”