Effect of Zinc Oxide Nano Particle Concentration in the Polyaniline-Zinc Oxide Nanocomposite on the Dielectric Property

Abstract

Films of polyaniline and polyaniline–ZnO composites were synthesized by spin coating. The spin coated films were deposited over glass substrate. In order to confirm the dispersion quality and the size of the dispersed ZnO, Transmission electron microscopy was done. The TEM images show that ZnO nanoparticles were spherical in shape. Dark imaging mode confirmed these particles in solid phase and revealed the uniform distribution of the particles in the PANI matrix. The absorption peaks in FTIR spectra of PANI–ZnO composite film were found to shift to higher wave number when compared with pure PANI. The observed shifts were attributed to the interaction between the ZnO particle and PANI molecular chains. A change in the value of lattice parameter of ZnO as confirmed through the X ray diffraction method in the composite indicated the presence of interaction between ZnO particles and matrix. The dielectric study of PANI and PANI–ZnO composites demonstrated a significant decrease in the value of dielectric constant after the incorporation of the ZnO nanoparticles in the polymer matrix.

Carbon Nanotube-Reinforced Poly(4-vinylaniline)/Polyaniline Bilayer-Grafted Bacterial Cellulose for Bioelectronic Applications

“…49,50 When grafting PANI, the spectrum acquires its identical absorption peaks. The CC stretching vibrations of the quinoid (Q) and benzenoid (B) rings of PANI can be observed at 1557 cm −1 (NQN) and 1483 cm −1 (N−B− N), 51 amines) of the quinoid and benzenoid rings are found at 1290 and 1249 cm −1 , respectively. 52 Polaron formation of the quinonoid structure (QN + H−B or B−N + H−B) is due to doping (at 1118 cm −1 ) which confirms PANI is its electrically conducting form.…”

“…The peak at 1518 cm –1 in the BC/PVAN membrane spectrum may be attributed to the CC stretching mode characteristic of aromatic rings. , When grafting PANI, the spectrum acquires its identical absorption peaks. The CC stretching vibrations of the quinoid (Q) and benzenoid (B) rings of PANI can be observed at 1557 cm –1 (NQN) and 1483 cm –1 (N–B–N), whereas C–N stretching vibrations (C–N of secondary amines) of the quinoid and benzenoid rings are found at 1290 and 1249 cm –1 , respectively . Polaron formation of the quinonoid structure (QN + H–B or B–N + H–B) is due to doping (at 1118 cm –1 ) which confirms PANI is its electrically conducting form …”

Conductive Polymer–Inorganic Hybrid Materials through Synergistic Mutual Doping of the Constituents

“…As shown in Figure 6b, after 200 ZnO infiltration cycles, the characteristic peaks of PANI/ZnO appear at 31.76, 34.3, 36.21, 47.43, 56.5, 62.81, and 67.85°, which can be indexed to the standard hexagonal wurtzite structure of ZnO. 38 No visible secondary phases or impurity peaks are observed.…”

Poly(4-vinylaniline)/Polyaniline Bilayer-Functionalized Bacterial Cellulose for Flexible Electrochemical Biosensors

“…The peak at 1518 cm −1 of BC/PVAN membrane spectrum may be attributed to CC stretching mode characteristic of aromatic rings. 57,58 In BC/PVAN/PANI spectrum, CC stretching vibrations of the quinoid (Q) and benzenoid (B) rings from PANI can be observed at 1557 cm −1 (NQN) and 1483 cm −1 (N−B−N), respectively, 59 whereas C−N stretching vibrations (C−N of secondary amines) of the quinoid and benzenoid rings are found at 1290 and 1249 cm −1 , accordingly. 3 The intensity of benzenoid and quinoid vibrations is approximately in the same range, which reflects the existence of equal amounts of Q and B moieties.…”