Transport Properties of Conductive Polyaniline Nanocomposites Based on Carbon Nanotubes

Abstract

Intrinsically conducting polymers have been studied extensively due to their intriguing electronic and redox properties and numerous potential applications. To improve and extend their functions, the fabrication of multifunctional conducting polymer nanocomposites has attracted a great deal of attention with the advent of nanoscale dimension. In this paper we report the comparative study of nanocomposite synthesized by an in-situ oxidative polymerization of aniline monomer in the presence of functionalized multiwall carbon nanotubes (MWCNT) with that of pure polyaniline (PANI). Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and x-ray diffraction (XRD) are employed to characterize the pure PANI and the PANI-CNT nanocomposite. XRD and SEM reveal the homogeneous coating of PANI onto the CNT indicating that carbon nanotubes were well dispersed in polymer matrix. The interaction between the quinoid ring of PANI and the MWCNT causes PANI chains to be adsorbed at the surface of MWCNT, thus forming a tubular core surrounding the MWCNT was confirmed from FTIR. Nanocomposite shows high electrical conductivity compared to pure PANI. The enhancement in conductivity of the nanocomposite is due to the charge transfer effect from the quinoid rings of the PANI to the MWCNT. The effect of MWCNT on the transport properties of PANI in the form of the transport parameters such as charge localization length, most probable hopping distance and charge hopping energy in the temperature range 300-430 K was also studied.

Effect of in-situ oxidative preparation on electrical properties of Epoxy/PANi/MWCNTs nanocomposites

“…The peak around 1460 cm -1 and around 1500-1600 attributed to the benzoid [11,[16][17][18] and C=C stretching quinoid ring [11,16,17], respectively. The peak near approximately 1720 cm -1 assigned to C=O stretching of the carbonyl group [19].…”

“…The peaks at 1044 and 2930 cm -1 were considered to the effect of p-TSA as a surfactant dopant and corresponded to the SO 3-group of p-TSA and the stretching vibration methyl(-CH3) group, respectively [16]. The peak near 3300 cm -1 attributed to epoxy OH [20] and stretching NH [16][17][18] too that have been almost together. OH peak in all samples are available and with the increase of carbon intensity increases that it represents the link between the nanotubes and the epoxy.…”

Percolation thresholds of 3D all-sided percolation clusters in non-cubic domains

“…Following the literature data [19,20], R c was assumed to be equal to 1.045·10 -4 mm (see the description of numerical experiments in [21] for more details), and the side length of the domain L was assumed to be equal to 0.01 mm.…”

Polyaniline-modified nanocellulose prepared from Semantan bamboo by chemical polymerization: preparation and characterization

“…(020) and (200) crystal planes, respectively, conrmed that polyaniline was in the form of emeraldine salt. 37 The crystallinity of PANi can be ascribed to the repetition of the benzoid and quinoid rings in the PANi chains. 38 The highest peak appeared at 2q ¼ 25.…”