Fig. 6From: High Methanol Gas-Sensing Performance of Sm2O3/ZnO/SmFeO3 Microspheres Synthesized Via a Hydrothermal MethodHigh-resolution XPS spectra of Sm (a), Fe (b), Zn of S3 (c), and O 1 s of S1, S2, S3, and S4 (d)Back to article page