Carbon nanotubes have been of tremendous interest since their discovery bys. Iijima in 1991, both from a basic standpoint and for future uses. The electrical, mechanical, optical, and chemical properties of this structure are the most striking aspects. In this research, A developed method was used to prepare carbon nanotubes from the electrodes of spent batteries. An electric discharge method was used between two carbon electrodes in deionized water, one representing the anode and the other the cathode. The cathode contains catalysts such as copper. Three different battery models (80 -100 - 120) ampere, have been prepared, where a precipitate resembling a sponge was obtained in deionized water, and after filtration, the carbon nanotubes was obtained. Several techniques such as Field Emission Scanning Electron Microscopy (FESEM), Transmission Electron Microscopy (TEM), and X-ray Diffraction (XRD) were used to detect the resulting carbon nanotubes, whereby carbon nanotubes were obtained. With a diameter ranging from (4) to (11) nanometers and a length from (120) to (1182) nanometers.It was investigated how operating temperature affected thin film sensitivity. Equation (1.1) was used to determine the sensitivity factor (S%) at different temperatures (200C, 250C, and 300C), At a temperature of 200°C, 100A sample, it was discovered that the maximum sensitivity to hydrogen sulfide gas is (94%) and the highest sensitivity to nitrogen dioxide is (63.5%).

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