Optically anisotropic substrates via wrinkle-assisted convective assembly of gold nanorods on macroscopic areas

• DOI: 10.1039/c4fd00236a
• Publication Date: 2014-12-10T17:32:14Z
• Authors: Moritz Tebbe; Martin Mayer; Bernhard A. Glatz; Christoph Hanske; Patrick T. Probst; Mareen B. Müller; Matthias Karg; Munish Chanana; Tobias A. F. König; Christian Kuttner; Andreas Fery
• Keywords: Nanorod; Wrinkle

We demonstrate the large-scale organisation of anisotropic nanoparticles into linear assemblies displaying optical anisotropy on macroscopic areas. Monodisperse gold nanorods with a hydrophilic protein shell are arranged by dip-coating wrinkled surfaces and subsequently transferred to indium tin oxide (ITO) substrates capillary transfer printing. elucidate how tuning wrinkle amplitude enables us precisely adjust assembly morphology fabricate single, double triple nanorod lines. For single lines, we quantify order parameter as well interparticle distances from scanning electron microscopy (SEM) images. find an 0.97 mean gap size 7 nm. This combination close perfect uni-axial alignment close-packing gives rise pronounced properties due strong plasmonic coupling. characterise response ITO-coated glass <italic>via</italic> UV/vis/NIR spectroscopy determine 0.91. The thus metamaterials, their periodicity building block sizes below wavelength. presented approach does not rely lithographic patterning provides access functional materials, which could have applications in subwavelength waveguiding, photovoltaics, for large-area metamaterial fabrication.