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. 2018 Nov 23;8(4):116. doi: 10.3390/bios8040116

Figure 11.

Figure 11

The schematic view of the heterojunction formed at the surface of the cerium oxide (Ce) core-shell tungsten oxide (W) wires and the possible mechanism (a) after exposure to air and (b) reducing gases such as acetone. LD is the Debye length or depth of the depletion region from the surface (not at scale).