NiO/ZnO composite decorated on rGO for detection of NO2

The rGO-NiO/ZnO composites were successfully synthesized by hydrothermal and hydrazine hydrate reduction methods and were used to detect NO2. The structure and morphology of the composites were characterized using spectrum techniques. The sensing tests showed that the triadic composite of rGO (0.5 wt%)-NiO/32ZnO exhibits a liner response toward NO2 in the concentration range of 0.5–3 ppm and the highest response reaches 75.3 to 2 ppm NO2 at 140...