Arrays of alternating metallic nanostructures present hybrid properties, which are useful for applications in photonics and catalysis. Block copolymer films provide versatile templates for fabricating periodic arrays of nanowires. Yet, creating arrays with alternating compositions or structures requires different modifications of domains of the same kind. By controlling the penetration depth of metal precursors into the film we were able to impregnate different layers of copolymer cylinders with different metals. Capitalizing on the hexagonal packing of the cylinders led to simultaneous formation of nanowires with alternating compositions and periodic arrangement on the substrate after plasma etching. Selective deposition of nanoparticles on the film enabled creating alternating bare and decorated nanowires, as well as trimetallic nanowire arrays.
Bibliographical noteFunding Information:
We thank Mr Atzmon Vakahi for assistance in sample preparation using FIB, Dr Sergei Remennik for TEM characterization, and Dr Yaron Aviv for assistance in the early stages of the project. OB and NE thank the Hebrew University and the Hebrew University Center for Nanoscience and Nanotechnology (HUCNN) for MSc fellowships. EM thanks the Cambr Charitable Foundation for financial support. We thank the Israeli Science Foundation (grant number 229/17) and Israel Innovation Authority for financial support.
© The Royal Society of Chemistry.