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...