Preparation and study of the effect of binary doping on the electrical and optical properties of polyamide

The study included three stages, the first stage is to prepare the monomer (basic unit Nʹ,N di-Asetil benziden) and the second stage is preparing the polyamide and third stage is doping the polymer single doping by acidic solutions H₂SO₄, HCl with concentrations (0.25 , 0.5 , 0.75 , 1) Molar and different metal chlorides with percentages ( 3-20 )%. Then the best doping of acidic solutions (H₂SO₄) and best doping of metal chlorides (FeCl₃) doped binary doping by mixing with pure polyamide to prepared samples that doped binary doping. Current-Voltage (I-V) characteristics were measured to show the conduction mechanism also the electrical conductivity (σ) as a function of temperature within the range (300-360)^ᴼK and calculate the activation energy (E_a) and studying the optical characteristics represented by ( FT - IR ) for the prepared sample before and after doping to show the binary doping effect on this characteristics as well as comparing between them. The aging effect on the sample which gives the highest electrical conductivity (σ) for three months was studied also. The results showed that the electrical conduction mechanism is ohmic within the low voltage and space charge limited current (SCLC) at high voltage. Also we see that the binary doping affect the electrical conduction mechanism and it is higher than the conduction of pure and primary doping with acidic solutions and metal chlorides <span style="text-decoration: underline;">.</span> and the activation energy for the binary doping is about ( 0.184)eV which is much less than the activation energy for the pure and single doped. The optical characteristics represented by ( FT - IR ) also showed an obvious change in the beam intensity comparing with pure polyamide, and the doped by acidic solution, the reason referred to formation an electronic density of the active groups charge transfer complexes. The effect of the time factor of the binary doped we found that the conductivity of the binary doped polyamide increased when we took into consideration the time factor, the conductivity increased in the beginning of the storing then decreased gradually reached to(7.11 ͯ 10-4 S.m-1) the settled along the aging period approximately.