Gold nanorings (AuNRs) are attractive in photonics, electronics, catalysis, bioimaging, and biosensors, due to their unique geometries and optical properties. Comparing with their isotropic counterparts (e.g., Au nanospheres), such topologically complex nanostructures exhibit localized surface plasmon resonance (LSPR) over a much broader window of wavelengths. Controlling the geometry (i.e., diameter and ridge thickness) and organization (i.e., orientation, symmetry, and spacing) of AuNRs in assemblies is highly desirable for tailoring the plasmonic couplings and hence the optical response of resulting materials. However, to date synthesis and optical study of AuNRs are still in their infancy, mainly due to current challenge in the synthesis of high-quality anisotropic nanoparticles at large quantity with precise control. Although existing top-down techniques (e.g., e-beam lithography) provide high precision and reasonable resolution in fabrication of AuNRs, these methods are limited by their high cost, low yield of production, and the requirement of special equipment. Herein, we present a facile wet-chemistry synthesis of circular and triangular AuNRs with tunable surface roughness, dimension, and hence optical properties. The synthesis approach includes the epitaxial Au deposition on sacrificial templates of shaped Ag nanoplates, chemical etching to remove Ag, and further Au deposition to achieve desired ridge thickness. Furthermore, the freestanding AuNRs are ready to be used as building blocks for multi-dimensional self-assembly experiments. We demonstrated the 2-dimentional self-assembled monolayers (SAMs) of AuNRs fabricated at liquid-liquid interfaces. The SAMs can be transfered to flexible substrate and be used for tensile sensors. This research may provide new insights on plasmonic coupling of metallic nanostructures and open avenues to advanced optical devices at micro- and nanoscale.

Controllable synthesis and two-dimensional self-assembly of gold nanorings with tunable optical properties

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.