Effect of Ni content, temperature on the electrical and colorimetric properties of nano NixZn(1-x)O blue pigments

Abstract

Nanosized Ni doped ZnO (NixZn1-xO, with 20 ≤ × ≤ 70) were synthesized by simple coprecipitation method at different calcinations temperature (400, 600, 800 and 1000 o C). All synthesized oxides well characterized by XRD, scanning electron microscopy (SEM). The electrical properties and the colorimetric parameters (CIEL L* a* b*) were measured. The results obviously show that Ni2+ ions incorporated into the ZnO structure without difficulty. For the highest concentration of Ni2+ for x = 0.40 and 0.70 of Ni2+ doping, the XRD revealed an extra diffraction peak characteristic to NiO, indicating an upper limit of Ni concentration. The crystallite size was discovered to be between 13 and 109 nm. With the addition of Ni to the ZnO, the temperature dependency of electrical conductivity of samples increases. The temperature dependence of dielectric constant of samples is found to decrease with incorporation of Ni in the solution. The samples show very good blue color with load 20% of Ni.