TiO2 doped with SnO2 and studing its structurail and electrical properties

In this research we prepared a ceramic sample of (TiO2) doped with different ratios of (SnO2) to produce a humidity sensor, that is applied in many important electronic and industrial fields. As well, to get better electrical conductance. The work was done according to the diagram (1). The samples were prepared by (Sol-Gel) technology, during three stages: (solution, gel, powder). The samples were studied by (XRD) to determine the crystal structure, the prepared samples of (TiO2) doped with (SnO2) showed poly-crystal structure, and grain size has nano-dimensions between (40 nm and 65 nm),The electrical properties of the samples were studied too,The study of the prepared samples showed electrical resistance (6x108 Ω - 1x106 Ω), its conductivity increased when humidity increase (%RH), Whenever the ratio of (SnO2) increased against (TiO2), the electrical conductivity would increase. By using Mott Schottky equation the concentration of free electrons (ND) in (TiO2), and this showed that not only the shallow charges contributed in conductivity, but the deep charges contributed, too, when the voltage increased (V).