Abstract: Thin nanoparticles of zinc oxide were prepared using sol-gel. "The samples were prepared nano thin film (71 nm), various weight ratios were added from the MWCNT to the colloidal solution and at a rate of" (0.423, 0.921, 1.624%). These solutions were deposited by using the spin coating technique on the glass substrate and interdigitated finger electrode. For the purpose of knowing the sensitivity and the extent of response of these samples to detect the different vapors of some toxic gases (ethanol, methanol, acetone and nitrogen). Nano thin film were prepared by using spin coting technique. The synthetic properties of these membranes were studied using X-ray diffraction.