“…Another important approach to fabricating axial nanowire heterostructures is through the solid-state reaction between a semiconductor nanowire and metal on contact that is deposited on top of the nanowire (Wu et al, 2004;Weber et al, 2006;Lin et al, 2008Lin et al, , 2010Tang et al, 2012Tang et al, , 2013. As an example, thermal annealing of an Si nanowire that is in contact with nickel (Ni) leads to the migration of Ni atoms into the wire, forming a NiSi alloy near the contact (Wu et al, 2004).…”