Thermal, electrical, and dielectric properties of reduced graphene oxide–polyaniline nanotubes hybrid nanocomposites synthesized by in situ reduction and varying graphene oxide concentration

Abstract

In this study, reduced graphene oxide (RGO) has been introduced as conductive filler within polyaniline (PAni) nanotubes (PAniNTs) by in situ chemical reduction method to enhance the properties of PAniNTs. The effect of varied concentration of in situ reduced GO on the structural, thermal, electrical, and dielectric properties of RGO–PAniNTs nanocomposites have been investigated by high resolution transmission electron microscope, X‐ray diffraction, Fourier transform infrared, thermogravimetric analysis, I–V characteristics, and impedance analyzer. The enhanced thermal stability of the nanocomposites has been analyzed from the derivative thermogravimetric curves in terms of onset and rapid decomposition temperature. The transport mechanisms have been studied by fitting the nonlinear I–V characteristics to the Kaiser model. The dielectric relaxation phenomena have been investigated by permittivity and modulus formalisms. Characteristic relaxation frequency of RGO–PAniNTs nanocomposites shifts toward higher frequency with increasing RGO concentration indicating a distribution in conductivity relaxation. The distribution of relaxation time has been studied by fitting the imaginary modulus spectra of the nanocomposites to Bergman modified KWW function. The ac conductivity spectra are fitted to the Jonscher's power law equation and enhanced conductivity value of 1.26 × 10−3 S cm−1 is obtained for 40 wt % of RGO compared to 1.22 × 10−4 S cm−1 for PAniNTs. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45883.

Enhanced Electrical and Electromagnetic Interference Shielding Properties of Polymer–Graphene Nanoplatelet Composites Fabricated via Supercritical-Fluid Treatment and Physical Foaming

“…Different methods have been used to develop more efficient graphene-based polymer composites with enhanced electrical and EMI shielding properties. These have included modifying the graphene platelets’ surfaces, , exploiting the synergistic behavior of the hybrid nanomaterials, , and in situ polymerization. , Zhao et al fabricated hybrid poly­(vinylidene fluoride)–5 wt % carbon nanotube/10 wt % graphene nanoplatelet (GnP) thin films of 0.1 mm thickness, using solution casting followed by hot pressing with the EMI shielding effectiveness (SE) of 27.58 dB. Wu et al developed EMI shielding graphene foam (GF)/poly­(3,4-ethylenedioxythiophene):poly­(styrenesulfonate) (PEDOT:PSS) composites by drop coating of the PEDOT:PSS on the cellular structure of the freestanding GFs.…”

“…Unlike the batch-type synthesis methods, ,,− injection molding is an economically viable and continuous method to manufacture polymer composites. When it is combined with physical foaming, another layer of flexibility is added, which can tailor the polymer composites’ functional properties.…”

Enhanced triboelectric performance of graphene oxide-conducting polymer hybrid modified polydimethylsiloxane composites

“…Further, the difference in the electrical properties of GO and CPs resulted in the formation of a heterogeneous system, leading to charge localization at interfaces via the Maxwell–Wagner–Sillars interfacial polarization phenomenon. 40 The dielectric constant of neat PDMS increased from 3.5 to 4.6 by incorporating 0.5 wt% of the 1 : 4 GO : PPy filler into the PDMS matrix. The PDMS composite prepared by the addition of 1 : 4 GO : CP showed better dielectric properties when compared to other PDMS composites.…”

“…Further, the difference in electrical properties of GO and CPs resulted in the formation of a heterogeneous system leading to charge localization at interfaces via the Maxwell-Wagner-Sillars interfacial polarization phenomenon. 40 The dielectric constant of neat PDMS was increased from 3. 1), ( 2) and (3).).…”

Surface modification of reduced graphene oxide‐polyaniline nanotubes nanocomposites for improved supercapacitor electrodes

“…Upon reducing GO, the (002) peak shifts to a higher angle of 24.6° exhibiting a d ‐spacing of 0.36 nm due to the efficient removal of oxygen containing groups from GO. PAniNTs show diffraction peaks at 2θ = 19.2° and 25° that are identified as the (020) and (200) planes of PAni with a periodicity parallel and perpendicular to the polymer backbone chain, respectively . Two broad peaks appear for unirradiated RGO‐PAniNTs nanocomposite, one ranging from 2θ = 15°‐28° and the other centered at 2θ = 43°.…”