Structural, magnetic and dielectric properties of polyaniline/MnCoFe2O4 nanocomposites

Synthesis of polyaniline/spinel ferrites core-shell nanocomposites via sucrose auto-combustion and in situ polymerization

“…The pure PANI, pure NiFe 2 O 4 (as a typical example for comparison) and PANI/MFe 2 O 4 nanocomposites' FT-IR spectra are presented in figure 2. The pure PANI spectrum showed different bands centered at 1552, 1468, 1290, 1232, 1132, and 875 cm −1 ; these bands agree with the PANI characteristic bands reported in the literature [1,[23][24][25]. The bands at 1552 and 1468 could be referred to as the carbon-carbon double bond (C=C) vibration modes of the benzenoid and quinonoid ring, whereas the two bands between 1360 and 1200 cm −1 might be attributed to the benzenoid ring's carbon-nitrogen bond (C-N) vibration mode.…”

“…According to their sizes, the dark ones could be attributed to MFe 2 O 4 nanoparticles, completely surrounded and impeded in the light big globular aggregates of the PANI matrix with smooth surfaces. The wrapping of the entire ferrite particles by the PANI matrix, as appeared in this structure, gives what is called core-shell structure, as revealed by many investigators for similar systems [23][24][25].…”

TiO2 reinforced polymeric nanocomposites of HCl‐doped polyaniline and their properties

“…These figures revealed that the dielectric constant and dielectric loss increased with increase in frequency due to charge relaxation. The high dielectric constant (3,440) and dielectric loss (34,458) were found around at temperature 373 K. The ac conductivity was found almost constant value in the low frequency region and its variation was found in the high frequency region. Macedo et al [46] introduced the concept of electric modulus M* (51/e à ) and investigated the conductivity relaxation due to hopping of ions in vitreous ionic conductors.…”

“…They measured the dielectric properties of PANI-TiO 2 nanocomposite film in the frequency range 1 kHz-1 MHz and temperature range 35-1508C. In the previous communication, Dey et al [25] [34] have also been largely employed to impart requisite properties into the polymeric matrix of PANI. Thus the synergistic combination of conductive polymers and inorganic (metal oxide) nanofillers results into multicomponent polymeric nanocomposite materials which are largely used in electrolyte membrane [35], electromagnetic interference shielding [36], rechargable batteries [37], biological/chemical/gas sensor [38,39], anticorrosion coating [40], and microwave absorption [41].…”

“…They investigated dc and ac conductivity as a function of frequency and temperature and observed a very large increase in dielectric constant of about 3,700 at room temperature. Furthermore, metal‐doped ferrite reinforced polymeric nanocomposites such as PANI‐MgFe 2 O 4 , PANI‐Ni 0.5 Zn 0.5 Fe 2 O 4 , PANI‐CoFe 2 O 4 , and PANI‐MnFe 2 O 4 have also been largely employed to impart requisite properties into the polymeric matrix of PANI. Thus the synergistic combination of conductive polymers and inorganic (metal oxide) nanofillers results into multicomponent polymeric nanocomposite materials which are largely used in electrolyte membrane , electromagnetic interference shielding , rechargable batteries , biological/chemical/gas sensor , anticorrosion coating , and microwave absorption .…”