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Nanomaterials are integrated nowadays in all modern nano-devices. The reduced size helps electronics to have increased performance, low energy consumption and low heat output. Unique properties of nanomaterials are mainly related to the large surface to volume ratio but also to the 3D nano-architecture of the array, which can be used to trap the light by internal reflection when used in solar cells [1-4]. Compared to elemental metallic and semiconductor nanowires, the fabrication of compound or alloy nanowires imposes additional challenges. One technique to produce nanowires (NWs) is using template synthesis, in which the growth material is forced through the pores of a template. Electro-deposition in a template is a wellestablished technique for the inexpensive synthesis of nanowire arrays and has the advantages of low cost, ease of scalability, and highly tunable size control from diameters of a few nanometers to microns or larger. Any template with well-defined pores may be used, but tracketched polycarbonates (PCTE) or anodic aluminum oxide (AAO) are common due to their transversal nanopores. The technique may be used for the synthesis of nanowires, nanotubes, or intermediate structures, or even more complex geometries controlled by the choice of template and deposition protocol. Fabrication of nanowire array by template synthesis is presented in Fig. 1 for Co-Ni alloy NWs. Briefly, the non-conductive membrane is coated with gold on one side of the membrane, which acts as electrode. Then, Co-Ni alloy is electro-chemically deposited from the Au base up through the nanopores. The nanowires array is exposed by dissolving the membrane in a solvent. Iron-group alloys and nanomaterials fabricated therefrom are a broadly applicable class of materials for a wide range of applications, thanks to their conductivity and magnetic properties. Nanowires consisting of cobalt and nickel, in particular, hold promise for applications in magnetic media, miniaturized magnetic drivers, and MEMS. Also, NWs consisting of compounds containing nickel and cobalt find applications in batteries, thermoelectric and magnetic devices and sensing.

Co-Ni Nanowires Arrays with Tunable Properties Obtained by Template Synthesis