Non-covalent functionalization of graphene oxide using self-assembly of silver-triphenylphosphine for bactericidal formulations

Au101–rGO nanocomposite: immobilization of phosphine-protected gold nanoclusters on reduced graphene oxide without aggregation

“…The spectrum of PPh 3 (inset) exhibits two peaks at 227 and 260 nm, which are assigned to the n–σ* transition from P atoms and the C C π–π* transition in the aromatic ring, respectively. 52 As discussed above, the rGO spectrum has a strong absorption peak centred at 270 nm ( Fig. 2(a) ).…”

“…The position shift of the PPh 3 related peaks could be due to the π–π interaction between the ligand and rGO. 52 The spectrum of Au 101 NC–rGO shows similar absorption bands to PPh 3 –rGO, although the peak at 270 nm is more intense but less distinct. Again, this suggests the formation of non-covalent interactions between the PPh 3 ligands and rGO in the Au 101 NC–rGO nanocomposite.…”

Toward Large-Scale Production of Oxidized Graphene

“…As the interaction time increased between GO and CA, the reduction effectivity increased from 0.5 to 1.5 h; however, a slight oxidation was observed after 2 h. This result could be attributed to a partial oxygen functionalization from water molecules because the reduction was carried out at 95 • C. In particular, the observed reduction of oxygen element was about 7% at 0.5 h and 13% at 1.5 h. We focused on the reduction at 0.5 h to optimize the production process, avoid a probable instable reduction, and preserve a good dispersibility in water. The latter is an important feature that may be exploited in antibacterial and cytotoxic applications [42]. The reduction of GO into rGO was further confirmed by UV-vis absorption spectroscopy and the observed results are depicted in Figure 3a (and Figure S3).…”

Advances in Biologically Applicable Graphene-Based 2D Nanomaterials

“…Using triphenylphosphine linkage to decorate the surface of GO nanosheets by AgNPs, the surface of GO sheets was covered with AgNPs via non-covalent and permanent bonding, altering structural and electronic properties as well as inducing oxidative stress, resulting in death of Bacillus subtilis , Enterococcus faecalis , MRSA, S. aureus , E. coli , Serratia marcescens , Shigella sp., Salmonella sp., Serratia liquefaciens , Proteus sp., Enterobacter cloacae , and P. aeruginosa [ 140 ]. By co-incorporation of high amounts of GO/AgNPs into poly- l -lactic acid (PLLA) fibrous deposited on Mg alloy via electrospinning, improved antibacterial performance against E. coli and S. aureus was observed, compared to that of Mg alloy and neat PLLA fibrous, and the coating also showed the adequate corrosion resistance and cytocompatibility required for use in orthopedic applications [ 141 ].…”