Cadmium oxide is one of the promising transparent conducting oxides (TCO) with high electrical conductivity which has found in extensive applications as storage battery electrodes , optoelectronic devices, solar cells, smart windows, optical communications, flat panel display, photo-transistors, photo-diodes, transparent electrodes and gas sensors. Sol¿gel-derived materials have received particular interest as chemical receptor matrices because of their optical transparency, mechanical stability, chemical resistance and flexibility in sensor morphological configurations. The materials have a wide spectrum of advantages: they may be set up at room temperature, they are not degraded electrochemically or by light, they are open to a wide variety of chemical modifications, they can be obtained in a variety of forms (monoliths, thin films, fibres or powders), and they are able to respond rapidly.Spin coating is a fast and easy method to generate thin and homogeneous organic films out of solutions. Spin coating is a procedure used to apply uniform thin films to flat substrates.