Preparation, structural characteristics and dielectric studies of polyaniline/lead sulfide composite materials

In this study, composite films of lead sulfide nanoparticles (PbSNPs) and polyaniline (PANI) were fabricated
for wearable electronic devices. The PbS/PANI samples were analyzed using FTIR, XRD, and SEM. Furthermore, the
effects of PbSNPs on the dielectric impedance, electrical conductivity, complex modulus, and energy density of PANI were
determined in the frequency range of 50–5 MHz. The FTIR and XRD confirmed the successful synthesis of PbS/PANI
films. The SEM indicated homogeneous dispersion of PbS in PANI. Besides, the broadness and reduction of PANI in FTIR
and XRD peaks intensity with increasing PbS is attributed to the intermolecular interactions of PANI and PbS and indicates
the successful incorporation of PbS in PANI. The conductivity was enhanced from 7.39 9 10–8 S.cm-1 for PANI to
1.38 9 10–6 S.cm-1 for PANI/0.05PbS. The constant e0
was increased from 20 for PANI to 111 for PANI/0.05PbS.
Moreover, the relaxation time sr of PANI was reduced from 9.68 9 10–6 s to 9.18 9 10–6, 6.43 9 10–6, and 5.98 9 10–6 s
for PANI/0.01PbS, PANI/0.03PbS, and PANI/0.05PbS, respectively. In conclusion, the obtained data confirmed that
incorporating PbSNPs inside PANI modified the dielectric properties of PANI/PbS films for use in energy storage devices.