Nanoindentation characterization of nanocomposites coating based on graphene and siloxane matrix deposited by dielectric barrier discharge plasma

Hexamethyldisiloxane (HMDSO)/Graphene nanosheets (GNs) nanocomposite coatings were deposited by a dielectric barrier discharge at atmospheric pressure. Commercially available GNs incorporated into HMDSO precursor different concentrations up to 2 wt%. The analyzed using scanning electron microscopy (SEM) and nanoindentation test. Based on SEM images, it was found that the well distributed dispersed in plasma polymerized hexamethyldisiloxane (ppHMDSO) matrix with no significant agglomeration. results of tests performed continuous stiffness measurements mode showed an increase hardness reduced Young's modulus graphene percentage. maximum two orders magnitude for 2% GNs/ppHMDSO compared homopolymer ppHMDSO. Furthermore, creep compliance analysis exhibited viscoelastic behavior polymer homopolymer.