Fig.7, shows that, the insulator behavior of the PVA for pure PVA. But, with increasing the time of reaction there is an improvement in the electrical conductivity of the PVA-Ag nanocomposite films. Fig.7 shows that, the (I–V) characteristic of the samples, and the inset of Fig. 7 shows the relation between the conductivity and time of reaction. Then, the dc conductivity was calculated at the (voltage = 10 V) using the relation. (S/cm)
Where (d) is the sample thickness, (A) is the area of the electrode and (R) is the sample resistance. The inset of Fig. shows that, it is clear that the conductivity increases with increasing the time of reaction. This can be illustrated on the basis of the charge transfer complexes (CTCs) formation inside …show more content…
8 presents the log (I) vs. log (V) plots for PVA-Ag nanocomposite films at the different time of reaction to study the conduction mechanism in the nanocomposites. From Fig. 8, the figure showed a linear action with log (V) at higher fields but showed at lower voltages there is a significant deviation from the linearity. This deviation is attributed to the accumulation of space charge at the electrodes. So we neglected the lower voltage range from our calculation, and selected the range (8-10 V). It is clearly observable from this figure that log (I) varies linearly with log (V) obeying the relation I α Vn. For samples a, b, b1, b2 and b3 the values of n (n > 2), this is attributed to the space charge conduction mechanism, and for sample b4 and b5 the value of n (n~1), this is due to the existence of an Ohmic conduction …show more content…
It was noticed that the exp was in good acceptance with the theoretical value of PF leading to the conclusion that Frank-poole emission is the prevailing charge transport mechanism operating in these films. This can be due to the trap levels into the dielectric (Poole–Frenkel effect), which is responsible for the conduction through the charge carriers released from it, which enhances as the number of trap levels increases on increasing the time of reaction. This enhances the formation of charge transfer complexes (CTCs) (trap levels) on PVA-Ag nanocomposites and with increasing the time of reaction (The doping of silver nanoparticles forms the trap levels, rich in charge carriers, which enhances the order of current in PVA matrix in the voltage range), where the measured values of the figure are
Where (d) is the sample thickness, (A) is the area of the electrode and (R) is the sample resistance. The inset of Fig. shows that, it is clear that the conductivity increases with increasing the time of reaction. This can be illustrated on the basis of the charge transfer complexes (CTCs) formation inside …show more content…
8 presents the log (I) vs. log (V) plots for PVA-Ag nanocomposite films at the different time of reaction to study the conduction mechanism in the nanocomposites. From Fig. 8, the figure showed a linear action with log (V) at higher fields but showed at lower voltages there is a significant deviation from the linearity. This deviation is attributed to the accumulation of space charge at the electrodes. So we neglected the lower voltage range from our calculation, and selected the range (8-10 V). It is clearly observable from this figure that log (I) varies linearly with log (V) obeying the relation I α Vn. For samples a, b, b1, b2 and b3 the values of n (n > 2), this is attributed to the space charge conduction mechanism, and for sample b4 and b5 the value of n (n~1), this is due to the existence of an Ohmic conduction …show more content…
It was noticed that the exp was in good acceptance with the theoretical value of PF leading to the conclusion that Frank-poole emission is the prevailing charge transport mechanism operating in these films. This can be due to the trap levels into the dielectric (Poole–Frenkel effect), which is responsible for the conduction through the charge carriers released from it, which enhances as the number of trap levels increases on increasing the time of reaction. This enhances the formation of charge transfer complexes (CTCs) (trap levels) on PVA-Ag nanocomposites and with increasing the time of reaction (The doping of silver nanoparticles forms the trap levels, rich in charge carriers, which enhances the order of current in PVA matrix in the voltage range), where the measured values of the figure are