Affiliation:
1. School of Materials Engineering, Wuhu Institute of Technology, Wuhu 241003, China
2. College of Ecology and Environment, Anhui Normal University, Wuhu 241003, China
3. College of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, China
Abstract
A new, simple, and effective one-step reduction method was applied to prepare a nanocomposite with spherical polycrystalline silver nanoparticles attached to the surface of reduced graphene oxide (Ag@rGO) at room temperature. Equipment such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR) was used to characterize the morphology and composition of the Ag@rGO nanocomposite. A novel electrochemical sensor for detecting L-cysteine was proposed based on fixing Ag@rGO onto a glassy carbon electrode. The electrocatalytic behavior of the sensor was studied via cyclic voltammetry and amperometry. The results indicate that due to the synergistic effect of graphene with a large surface area, abundant active sites, and silver nanoparticles with good conductivity and high catalytic activity, Ag@rGO nanocomposites exhibit significant electrocatalytic activity toward L-cysteine. Under optimal conditions, the constructed Ag@rGO electrochemical sensor has a wide detection range of 0.1–470 μM for L-cysteine, low detection limit of 0.057 μM, and high sensitivity of 215.36 nA M−1 cm−2. In addition, the modified electrode exhibits good anti-interference, reproducibility, and stability.
Funder
Synthesis of novel composites based on two-dimensional graphene and its catalytic degradation of organic pollutants under visible light conditions
Research on Collaborative Control of Nitrogen Oxides, Volatile Organic Compounds, and Greenhouse Gases in Wuhu City under Carbon Target
“Dual Carbon” and Energy Storage Technology Innovation Team
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1 articles.
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