Rapid synthesis and characterization of silver-loaded graphene oxide nanomaterials and their antibacterial applications

Abstract

With the promising potential application of Ag/graphene-based nanomaterials in medicine and engineering materials, the large-scale production has attracted great interest of researchers on the basis of green synthesis. In this study, water-soluble silver/graphene oxide (Ag/GO) nanomaterials were synthesized under ultrasound-assisted conditions. The structural characteristics of Ag/GO were confirmed by Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, scanning electron microscopy and energy dispersion spectroscopy, respectively. The results showed the silver particles (AgNPs) obtained by reduction were attached to the surface of GO, and there was a strong interaction between AgNPs and GO. The antibacterial activity was primarily evaluated by the plate method and hole punching method. Antibacterial tests indicated that Ag/GO could inhibit the growth of Gram-negative and Gram-positive bacteria, special for the Staphylococcus aureus .

Enhanced Anticancer Performance of Eco-Friendly-Prepared Mo-ZnO/RGO Nanocomposites: Role of Oxidative Stress and Apoptosis

“…The lower particle size and the higher surface area of NPs/NCs are associated with increased biological activity. 46 , 47 Figure 3 D–F shows the high-resolution TEM images of ZnO NPs, Mo-ZnO NPs, and Mo-ZnO/RGO NCs, respectively. These pictures depict that particles were highly crystalline and confirm the synergism of ZnO, Mo, and RGO with good-quality lattice fringes without defects, which is important in composite materials for potential biomedical applications.…”

A Novel Green Preparation of Ag/RGO Nanocomposites with Highly Effective Anticancer Performance

“…Decrements in the particle size of NPs after the incorporation of RGO were also reported in other studies [ 16 , 46 , 48 ]. Nanoscale materials with a smaller size and higher surface area exhibited higher biological activity [ 26 ]. High-resolution TEM images ( Figure 4 C,D) show the clear lattice fringes with measured interplanar distances of 0.233 and 0.229 nm for pure Ag NPs and Ag/RGO NCs, respectively, which corresponds to the (111) plane of the face-centred cubic structure of Ag [ 26 ].…”

“…Nanoscale materials with a smaller size and higher surface area exhibited higher biological activity [ 26 ]. High-resolution TEM images ( Figure 4 C,D) show the clear lattice fringes with measured interplanar distances of 0.233 and 0.229 nm for pure Ag NPs and Ag/RGO NCs, respectively, which corresponds to the (111) plane of the face-centred cubic structure of Ag [ 26 ]. Elemental analysis of Ag/RGO NCs by TEM-led EDS indicated the presence of Ag, C, and O elements with no impurities ( Figure 5 ).…”

“…The green synthesis of Ag/RGO NCs is gaining momentum [ 18 , 26 , 27 ]. It is advisable to prepare Ag/RGO NCs with highly effective anticancer performance and negligible side effects to humans and the environment.…”

Antibiofouling Activity of Graphene Materials and Graphene-Based Antimicrobial Coatings

“…The GO film demonstrated acceptable adhesion to root dentin, a significant inhibition of the bacterial proliferation and biofilm formation. Water-soluble Ag/GO nanomaterials were synthesized by Zhu et al [ 46 ] under ultrasound-assisted conditions and characterized by FTIR, X-ray diffraction, TEM, and SEM/EDX. The results showed that the silver particles are strongly attached to the GO surface and that the Ag/GO composites could inhibit the growth of S. aureus .…”