Figure 6
(a) The transient gas-responses of the sensors based on pure NiO, composites S-1, S-2 and S-3 based on α-Fe2O3/NiO nanosheet-covered fibers vs operating temperatures to 100 ppm acetone. (b) Gas responses of pure NiO and composites S-2 based on α-Fe2O3/NiO sensors to 100 ppm various target gases (Acetone; Ethanol; Methanol; Xylene, Toluene and Benzene) at 169 °C. (c) Real-time sensing-response curves of the sensors based on pure NiO, composites S-1, S-2 and S-3 based on α-Fe2O3/NiO nanosheet-covered fibers to various acetone concentrations at 169 °C. (d) Gas-responses of four sensors as a function of the acetone concentrations at 169 °C. Solid lines show the linear polynomial fitting of the experimental data. (e) The change of the sensitivity response of sensors based on pure NiO and S-2 based nanocomposites in different test chamber relative humidity (Error bars represent the standard error obtained in three measurements).
