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(a) Sensing transients of CuO nanostructures over the range 5–100 ppm NO2 at 275 °C, (b) Sensing transients of 2.2Cr-CuO nanostructures over the range 5–100 ppm NO2 at 275 °C, (c) Gas responses (Ra/Rg) of CuO and 2.2Cr-CuO nanostructures over the range 5–100 ppm NO2 at 275 °C, and (d) resistances in air (Ra) of the CuO, 0.76Cr-CuO, and 2.2Cr-CuO nanostructures over the range 250–400 °C.
