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TEM characterization of Si/HfO2 coreshell nanowires. (a) Schematic illustration of the synthesis of Si/HfO2 coreshell nanowires. Highly doped p-type silicon nanowire arrays were synthesized using catalytic chemical vapour deposition. Atomic layer deposition was used to grow HfO2 shell with controlled thickness. (b) TEM and (c) HRTEM images of Si/HfO2 coreshell nanowires.
