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Beilstein J. Nanotechnol. 2019, 10, 1423–1433, doi:10.3762/bjnano.10.140
Figure 1: (a) XRD patterns of pure WO3 and Mn3O4/WO3 composites, and (b) the magnified region of the (402) pe...
Figure 2: SEM images of (a) WO3, (b) 1 atom %, (c) 3 atom % and (d) 5 atom % Mn3O4/WO3 composites.
Figure 3: (a) TEM image and (b,c) HRTEM image of 5 atom % Mn3O4/WO3 composites.
Figure 4: N2 adsorption–desorption isotherms of pure WO3 and Mn3O4/WO3 composites.
Figure 5: (a) XPS survey spectrum of 5 atom % Mn3O4/WO3 composites. High-resolution XPS scan: (b) W 4f region...
Figure 6: Response of WO3 and Mn3O4/WO3 composite based gas sensors to 10 ppm H2S, 100 ppm NH3 and 100 ppm CO...
Figure 7: Response of WO3 and Mn3O4/WO3 composites to H2S, NH3 and CO at (a) 90 °C, (b) 150 °C and (c) 210 °C...
Figure 8: Dynamic response/recovery curves of 3 atom % Mn3O4/WO3 composite based gas sensors toward (a) H2S a...
Figure 9: (a, c, e) Response trends with respect to concentration and (b, d, f) corresponding log(S − 1) vs l...
Figure 10: Gas selectivity analysis of 3 atom % Mn3O4/WO3 composites at (a) 90 °C, (b) 150 °C and (c) 210 °C.
Figure 11: Stability of the 3 atom % Mn3O4/WO3 composite based gas sensor.
Figure 12: The gas sensing schematic models of WO3 (a,b) and Mn3O4/WO3 composites (c,d) in air and in CO.