Migration of Silver Nanoparticles from Silver Decorated Graphene Oxide to Other Carbon Nanostructures

Abstract

Decoration of graphene oxide (GO) sheets with Ag nanoparticles has been demonstrated using a simple sonication technique. By changing the ratio between Ag-decorated-GO and GO, a series of Ag-decorated-GO samples with different Ag loadings were synthesized. These Ag-decorated-GO samples were characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD) spectroscopy, thermal gravimetric analysis (TGA), and differential scanning calorimetric (DSC) techniques. TEM analysis showed that Ag nanoparticles were evenly distributed on GO sheets, and the size analysis of the particles using multiple TEM images indicated that Ag nanoparticles have an average size of 6-7 nm. TEM analysis also showed that Ag nanoparticles migrated from Ag-decorated-GO to later-added GO sheets. In XRD, all the Ag-decorated GO samples showed the characteristic peaks related to GO and face-centered-cubic (fcc) Ag. Thermal analysis showed peaks related to the combustion of graphitic carbon shifted to lower temperatures after GO sheets were decorated with Ag nanoparticles. In addition, further experiments performed using Ag-decorated-GO and multiwalled carbon nanotubes (MWNTs) confirmed that Ag nanoparticles migrated from Ag-decorated-GO to later-added carbon nanotubes without a noticeable coalescence of Ag nanoparticles.

The Preparation of Graphene Oxide-Silver Nanocomposites: The Effect of Silver Loads on Gram-Positive and Gram-Negative Antibacterial Activities

“…The binding between GO and Ag holds good hydrophilicity, high chemical stability, and high oxidization capacity which cause membrane and oxidative stress [ 12 ]. The proposed antimicrobial mechanism is that the GO wraps around bacteria while the Ag kills the bacteria with its toxicity [ 13 ].…”

Photochemical Oxidative Coupling of 2‐Naphthols using a Hybrid Reduced Graphene Oxide/Manganese Dioxide Nanocomposite under Visible‐Light Irradiation

“…Recently, our group established a concept to immobilize metal nanoparticles (NPs), complexes, salts, and oxides onto photoactive semiconductor supports either by an in situ or postgrafting approach to develop high‐performance photocatalysts with additional benefits of facile recovery and recycling for various transformations . Graphene oxide and reduced graphene oxide (rGO), which are fascinating carbon nanomaterials because of their extraordinary chemical, mechanical, and optical properties, have become used widely as semiconductors to immobilize various sensitizers, which include metal NPs and metal complexes, to develop improved photocatalysts that result from the synergistic combination of the individual properties of the component materials …”

“…[14][15][16] Graphene oxide andr educed graphene oxide (rGO), which are fascinating carbonn anomaterials because of their extraordinary chemical, mechanical, and opticalp roperties, have become used widely as semiconductors to immobilize variouss ensitizers, which include metal NPs and metal complexes, to develop improved photocatalysts that result from the synergistic combinationo ft he individual properties of the component materials. [17,18] Herein we report as imple, cost-effective,e fficient, and highyielding photocatalytic approachf or the oxidative self-dimeri-We describe asimple, cost-effective, efficient, and high-yielding photocatalytic approach for the oxidative self-dimerization of 2-naphthols using as emiconductor-metal hybrid that consists of intercalated manganese dioxide nanoparticles in reduced graphene oxide (rGO/MnO 2 )u nder visible-light irradiation. The desired photocatalyst was synthesized in as ingle step by mixing MnO 2 nanoparticles with rGO ultrasonically.T he hybrid photocatalyst exhibited as ignificantly highera ctivity than neat MnO 2 nanoparticles and rGO, which is believed to be because of the synergistic effect of its components.T oo ur knowledge, this hybrid rGO/MnO 2 nanocomposite is the first heterogeneous, green photocatalyst for the oxidative coupling of 2-naphthols under mild conditions.…”

Visible Light Driven Photocatalytic Efficiency of rGO‐Ag‐BiFeO3 Ternary Nanohybrids on the Decontamination of Dye‐Polluted Water: An Amalgamation of 1D, 2D and 3D Systems

“…This behaved like hot sites for the positively charged Ag ions (Ag + ), where it facilitated the electro‐static anchoring of Ag + ions on the surface of BFO and rGO. Upon the subsequent addition of the reducing agent (ascorbic acid) in the reaction mixture, these electro‐statically bound Ag + ions were further reduced to Ag 0 and the subsequent crystallization process led to the formation and decoration of Ag NPs onto the surface of the host rGO and BFO nanostructures …”