A Twisted Stack of Aligned Gold Nanowire Arrays from a Repetitive Tilted Transfer of Block Copolymer Thin Films
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Chiral nanomaterials can present chiroptical properties that can preferentially interact with circularly polarized lights. Based on such unique optical properties, there have been enormous efforts to utilize these novel materials in advanced optical and biomedical applications. However, artificial constructions of chiral nanostructures with high enantiomeric purity is still challenge. For pure chiral structure at the nanoscale, we fabricate a twisted stack of unidirectionally aligned gold nanowire arrays from the repetitive tilted transfer of a aligned block copolymer films. Firstly, we execute a shear rolling process for the alignment of BCP microdomains of cylindrical PS-b-P2VP films, and perform a liquid phase infiltration process of gold precursor selectively into the P2VP cylinders for creating an aligned gold nanowire array with diameter of ~20nm. Then to realize a chiral nanostructure, we repetitively transferred at a specific angle in a clockwise or counter-clockwise direction.