Abstract
Ag nanoparticles-modified 3D graphene foam was synthesized through a one-step in-situ approach and then directly applied as the electrode of an electrochemical sensor. The composite foam electrode exhibited electrocatalytic activity towards Hg(II) oxidation with high limit of detection and sensitivity of 0.11 µM and 8.0 µA/µM, respectively. Moreover, the composite foam electrode for the sensor exhibited high cycling stability, long-term durability and reproducibility. These results were attributed to the unique porous structure of the composite foam electrode, which enabled the surface of Ag nanoparticles modified reduced graphene oxide (Ag NPs modified rGO) foam to become highly accessible to the metal ion and provided more void volume for the reaction with metal ion. This work not only proved that the composite foam has great potential application in heavy metal ions sensors, but also provided a facile method of gram scale synthesis 3D electrode materials based on rGO foam and other electrical active materials for various applications.
Highlights
Noble metal particles (e.g., Au, Pt and Ag) have attracted considerable attention due to their unique physical and chemical properties, as well as their potential use in electronic, photonic, catalytic and biological applications [1,2,3]
In most cases, the Ag nanoparticles generated by the most methods were often in powder type, which were further coated on the glass carbon electrode (GCE) for electrochemical detection [4,5,6,7,8,9,10,11,12,13,14]
These results further indicated the formation of Ag NPs/reduced grpahene oxide (rGO) composite foam, in which the Ag nanoparticles were well dispersed in composite of Ag NPs/rGO composite foam, in which the Ag nanoparticles were well dispersed in composite foam
Summary
Noble metal particles (e.g., Au, Pt and Ag) have attracted considerable attention due to their unique physical and chemical properties, as well as their potential use in electronic, photonic, catalytic and biological applications [1,2,3]. The three-dimensional (3D) pore surface electrode based on graphene foam leaded to the enhanced electrocatalytic characteristics due to that the three dimensional architecture of rGO foam provided a large surface area, fast electron transport and allowed high accessibility to the reactants It was a convenient way of preparing freestanding electrode based on Ag nanoparticles for electrochemical detection by one step method, in which the Ag nanoparticles (Ag NPs) were in-situ grown on rGO foam. It was critical to be able to detect and measure the level of Hg(II) in both environmental and biological samples under aqueous conditions with high repeatability/reproducibility Based on these facts, Ag NPs/rGO composite foam electrode has been fabricated through an in-situ method for a highly sensitive Hg(II) electrochemical sensor. Owing to the unique porous morphology, the Ag NPs/rGO composite foam electrode delivered significant electrochemical activity and cycling efficiency
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