The pure CdO, pure ZnO, and CdO‐ZnO composite films are successfully prepared by simple chemical bath deposition (CBD) method. XRD reveals a polycrystalline nature of CdO‐ZnO nanocomposite. The SEM micrograph depicts porous web network like morphology of CdO‐ZnO nanocomposite and EDX shows good agreement of elements. CdO‐ZnO nanocomposite shows maximum response of 29.11% under optimum operating temperature of 275˚C at 24 ppm ethanol gas concentration.
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