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Research Article

Construction of 1D/2D α-Fe2O3/SnO2 Hybrid Nanoarrays for Sub-ppm Acetone Detection

Figure 7

Schematic illustration of the acetone sensing mechanism of (a) the pure SnO2 NSAs and (b) α-Fe2O3/SnO2 HNAs (not drawn to scale). (c) Energy band diagrams of α-Fe2O3/SnO2 system before and after equilibrium. EVAC: the vacuum level; EF: Fermi level; ECB: the bottom of conduction band; EVB: the top of valence band; Eg: band gap.

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