The silver nanoparticle (AgNP) coated graphene oxide (GO) hybrid nanofiller (Ag@GO) reinforced polyaniline (PANI) nanocomposite via in situ polymerisation method is synthesised. Fourier transform infrared (FTIR) spectroscopy analysis revealed the existence of chemical interactions between the Ag@GO hybrid nanofiller and the PANI matrix. The ultraviolet-visible (UV-VIS) spectroscopy showed the presence of a silver nanoparticle peak. The nanostructure morphology of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) established the presence of AgNPs on the surface of the GO nanosheets that successfully reinforced into the PANI matrix. The thermogravimetricdifferential scanning calorimetry (TG-DSC) thermograms revealed that the thermal stability of the PANI/Ag@GO nanocomposite was significantly enhanced due to the synergistic effect imparted by the AgNPs, GO, and PANI matrix. The dielectric relaxation spectroscopy (DRS) study indicated that the dielectric behaviour of the PANI/Ag@GO nanocomposite was enhanced because of the strong interfacial interactions existing between the Ag@GO hybrid nanofiller and PANI matrix.Polyaniline/Ag@GO nanocomposite has been prepared via in situ polymerisation method. The results showed that the thermal stability as well as the dielectric properties of the PANI/ Ag@GO nanocomposite increases due to the synergistic effect imparted by the GO, AgNP, and PANI, which may be suitable for application in the energy storage devices.

The polyaniline (PANI)‐coated functionalized multi‐walled carbon nanotubes (f‐CNTs) and silver nanoparticles (AgNPs) (PANI@f‐CNTs and PANI@AgNPs hybrid nanofillers) are synthesized by means of in situ polymerization of aniline monomer on the surface of f‐CNTs and AgNPs. The PANI@f‐CNTs and PANI@AgNPs hybrid nanofillers were successfully incorporated into the polymethyl methacrylate (PMMA) matrix through in situ polymerization of methyl methacrylate. The Fourier transform infrared spectroscopy analysis reveals that the existence of strong interfacial adhesive bonding between PANI@f‐CNTs and PANI@AgNPs hybrid nanofillers and PMMA matrix. The X‐ray diffraction (XRD) analysis indicates that there is no change in position of the diffraction peak as a result crystallinity of the samples are not much affected by the addition of hybrid nanofillers. The transmission electron microscopy and scanning electron microscopy analysis displayed that the phase morphology of the PMMA nanocomposites is significantly changed as well as hybrid nanofillers are homogeneously dispersed within the PMMA matrix. The AC conductivity (σac), dielectric permittivity (ɛ′) dielectric loss (tan δ) of the PMMA nanocomposites are remarkably increases whereas the real impedance (Z′) decreases by the Incorporation of the hybrid nanofillers into the PMMA matrix, which concludes that the synthesized polymer materials have most promising dielectric application. POLYM. COMPOS., 39:E1294–E1305, 2018. © 2018 Society of Plastics Engineers

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The present study deals with the synthesis of gold nanoparticles (AuNPs) reinforced functionalized single-walled carbon nanotubes (f-SWNTs)/multi-walled carbon nanotubes (f-MWNTs) based polyaniline (PANI) ternary nanocomposites, using in situ polymerization process to analyze the thermal, dielectric and sensing properties. The chemical interaction and nanostructure characteristics of the synthesized nanocomposites are studied using ultraviolet-visible (UV-Vis) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, X-ray diffraction (XRD) analysis, and X-ray photoelectron spectroscopy (XPS). The morphological characterizations of the nanocomposites are investigated by scanning electron microscopy (SEM) and field emission scanning electron microscopy (FESEM). The dispersion stability and average size distribution of the nanocomposites are examined by means of dynamic light scattering (DLS) technique. The thermal and dielectric properties of the nanocomposites are carried out by using thermogravimetry-differential scanning calorimetry (TG-DSC) and dielectric relaxation spectroscopy (DRS), respectively. The sensing behavior of the nanocomposites is analyzed through UV-Vis spectroscopy. The thermal, dielectric, and sensing properties of the Au@f-SWNTs and Au@f-MWNTs nanohybrids embedded PANI ternary nanocomposite is significantly increased due to the strong interfacial interactions originated between the hybrid nanofiller and PANI matrix.