Figure 4

TEM image of a WO3nano-wires in (b) reveals that the wire is a core with a shell of carbon, Au and Pd from prior-to-SEM coating as confirmed by EDS in (a) and (e). Inset (c) is an illustration of the core-shell structure of the WO3nano-wire and C/Au/Pd layer and (d) is TEM image of carbon nanotubes found alongside the WO3nano-wires