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Schematic illustrating the general synthesis of branched NW heterostructures. Following the synthesis of bare (type I) or core/shell (type II) NWs, Au-NPs are selectively deposited onto the respective backbone surfaces and then used as seeds or catalysts to define the nucleation and growth of branch NWs on the backbones. Branch NWs are synthesized using established aqueous solution (metal branches) and vapor-phase (semiconductor branches) methods.
