Structural characterization of chloride salt of conducting polyaniline obtained by XRD, SAXD, SAXS and SEM

Abstract

Emeraldine-salt polyaniline form (ES-PANI) was chemically synthesized using hydrochloric acid at time synthesis ranging from 0.5 to 48 h and characterized by X-ray diffraction (XRD), LeBail fit, Small-angle X-ray diffraction (SAXD), Small-angle X-ray Scattering (SAXS) and Scanning Electron Microscopy (SEM). Crystallinity and crystal data (a = 5.7122, b = 17.8393, c = 22.8027, α = 83.1575, β = 84.6971 and γ = 88.4419) were obtained by XRD and showed that the crystallinity did not vary with the time synthesis. LeBail fit revealed that the crystallites were very small lamellae with global average size around 39 Å. By SAXS it was obtained the particle Radius of Giration (Rg) of 320 Å. The maximum particle size (Dmax) of 650 Å was obtained from the pair-distance distribution function (p(r)). SEM images showed a fiber morphology formed by interconnected non homogeneous nanospheres. Electrical conductivity of the samples was in ∼1.84 × '10 POT.-4' S/cm.