Impedance Spectroscopy Study of the AC Conductivity and Dielectric properties of 3, 5-Dimethylpyridine-Iodine Charge Transfer Complex

Abstract

Solid charge transfer complex of n-donor 3, 5-dimethylpyridine (3, 5-Lutidine) with s acceptor iodine was prepared and characterised by using elemental analysis, UV-Vis, FTIR, 1 H NMR spectroscopy and powder XRD techniques. The electrical parameters of the prepared complex in the pellet form were studied at various temperatures and at wide frequency range by employing AC complex impedance spectroscopic technique. The Nyquist (cole-cole) plots have been successfully explained by employing (RC)(RC)(RC) equivalent circuit corresponding to grain , grain boundary and electrode contributions. The radii of the semicircular arc decrease with increase in temperature which suggests that the material exhibits negative temperature coefficient of resistance (NTCR) behaviour like semiconductors. Dielectric constant, e' and dielectric loss, e'' seems to decrease sharply with increase in frequency. The ac conductivity obeys the power law of frequency.

Study of the Dielectric Behavior as a Function of the Frequency at Different Temperatures on the Sample Pr0.525Y0.075Ca0.1Sr0.3Mn0.975Fe0.025O3

“…The complex permittivity ε*(ω) is known as ε*(ω) = ε′(ω) − jε″(ω) [20], in which the real part Nyquist plot is due to the superposition of three contributions. In other word three distinct semicircular arcs are not observed; one corresponds to the grain resistance contribution located at high frequency RC element; the medium corresponds to grain boundary resistance and the low is associated to electrode contributions [13].…”

Rapid production of Plasmodium sporozoite detection paper dipstick assays using cellulose nanocrystals: Proof‐of‐concept for bio‐based, locally developed, point‐of‐care devices

“…[ 19 ] Furthermore, a band at 854 cm −1 was discernible after antibody immobilization, this band has been assigned to C‐H torsion due to the amino acid residues added with the antibody. [ 20 ]…”

“…[19] Furthermore, a band at 854 cm −1 was discernible after antibody immobilization, this band has been assigned to C-H torsion due to the amino acid residues added with the antibody. [20] The process of antibody immobilization on CNC-Ch also increased the hydrodynamic radius of the CNCs. When the chitosan was adsorbed on the surface, the particles more than doubled their size, and the zeta potential changed from −10.4 ± 2.7 mV to 65.9 ± 0.97 mV which indicated colloidal stability.…”

Spectroscopic Studies, Thermal Behaviour and Ac Impedance Study of Chemically Synthesized Silver Doped Polyaniline / BaFe12O19 Polymer Composite

“…3a shows the variation of a.c impedance, Z with logarithamic frequency for PAB-30%, 40%&50% composites at room tempera-ture. It is observed that, Z values decreases with increase in frequen-cy and at higher frequencies the values of Z merges beyond the fre-quency 5.8 Hz for all the wt% of the composites, this may be due to the polarization effect [ 20,21].…”