Facile synthesis of silver-decorated reduced graphene oxide as a hybrid filler material for electrically conductive polymer composites

Abstract

Facile synthesis of silver-decorated reduced graphene oxide as a hybrid filler material for electrically conductive polymer composites Linxiang He and Sie Chin Tjong * Nano silver-decorated reduced graphene oxide (Ag-RGO) sheets were synthesized by simply dissolving graphite oxide and silver nitrate in N,N-dimethylformamide and keeping the suspension at 90 C for 12 h. These highly stable hybrid sheets were then incorporated into a polar polymer, polyvinylidene fluoride (PVDF), to prepare the Ag-RGO/PVDF nanocomposites via solution mixing. The Ag-RGO hybrid sheets were dispersed homogeneously in the polymer matrix, resulting in a low percolation threshold of 0.17 vol%. Above the percolation threshold, electrical conductivity of the Ag-RGO/PVDF composite system was about one order of magnitude higher than that of thermally reduced graphene/PVDF composites. This was attributed to the high intrinsic electrical conductivity of silver. The improved electrical properties render this novel composite system an attractive material for antistatic, electrostatic dissipative and electromagnetic/radio frequency interference shielding applications.Furthermore, the resistivity of the composite system increased with increasing temperature, generating a pronounced positive temperature coefficient effect of resistivity. Fig. 8 Effect of temperature on resistivity of Ag-RGO/PVDF composites with 0.17 vol% and 0.24 vol% filler loadings.Fig. 9 (a) Stress-strain curves of Ag-RGO/PVDF nanocomposite sheets with different Ag-RGO contents. (b) Tensile strength (left) and tensile strain (right) versus Ag-RGO loading content.This journal is

Mechanochemical Reinforcement of Graphene Sheets into Alkyd Resin Matrix for the Development of Electrically Conductive Paints

“…This high sheet resistance in the prepared graphene paint might be due to the difference between the nature of graphene and the insulting binder. The observed non‐linear behavior in the I–V characteristics is in close agreement with the previous reports on graphene and carbon nanotube based composite materials . The origin of these nonlinear I–V behavior is already seen in graphene sheets which can be arised due to several factors including (i) deformation of at the sheets, (ii) external doping, (iii) defects, (iv) residual oxygen groups (in case of chemically derived graphene) which can act as electron trapping centers and (v) the carrier concentration, etc ,.…”

High Strength Conductive Composites with Plasmonic Nanoparticles Aligned on Aramid Nanofibers

“…This is due to the interactions between Au NPs and the ANF matrix, which restricts the movement of polymer chains. This behavior is typical of polymer composites reinforced with fillers of nanoscale dimension . Generally, the addition of higher amounts of filler content to polymers leads to poor processability and inferior mechanical performance…”

“…Comparison of electrical conductivity and ultimate strength of Au‐ANF composite films with selected conductive nanocomposites (graphene based, carbon nanotube based, etc.) and amorphous metals . 1: graphene/PVC; 2: graphene/polypropylene; 3: graphene/polyimide; 4: RGO/PVDF; 5: graphene/ANF; 6: graphene/cellulose; 7: RGO/chitosan; 8: CNT/PPE; 9: CNT/polyethylene; 10: MWNT/epoxy; 11: MWNT/polyethylene; 12: CNF/epoxy; 13: MWNT/polyimide; 14: PANI/bacterial cellulose; 15: Au NPs/polyurethane; 16: Ce 70 Al 10 Cu 20 or Ce 68 Al 10 Cu 20 Nb 2 amorphous alloys; 17: Al–Ln amorphous alloys; 18: Pd 76 Cu 7 Si 17 thin film metallic glasses; 19: Au‐ANF film with 34.7 vol% Au content, 20: Au‐ANF film after 300 °C thermal annealing.…”

Novel electrospun polyvinylidene fluoride-graphene oxide-silver nanocomposite membranes with protein and bacterial antifouling characteristics

“…The oxygenated groups of GO with surface negative charges provide active nucleation sites by attracting positive silver ions from silver nitrate. DMF solvent then reduces silver ions to AgNPs since DMF acting as both solvent and reducing agent [43,44]. Consequently, most of the oxygenated functional groups of GO are removed, so insulating GO is converted to conducting reduced graphene oxide (rGO) [45,46].…”