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NiO@CuO nanocomposite was synthesized through a simple reflux and hydrothermal method. NiO@CuO gas sensor has been fabricated and investigated. The result revealed that the NiO:CuO molar ratio 1:1 of NiO@CuO (NC-1) sensor shows the fast response time which was 2s to 100ppm NO2 gas at room temperature (RT), which is better from NC-2 and NC-4 which have NiO:CuO molar ratios of 2:1 and 4:1, respectively...
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