Plasmonic metal nanostructures with complex morphologies provide an important route to tunable optical responses and local electric field enhancement at the nanoscale for a variety of applications including sensing, imaging, and catalysis. Here we report a high-concentration synthesis of gold core-cage nanoparticles with a tethered and structurally aligned octahedral core and examine their plasmonic and catalytic properties. The obtained nanostructures exhibit a double band extinction in the visible-near infrared range and a large area electric field enhancement due to the unique structural features, as demonstrated using finite difference time domain (FDTD) simulations and confirmed experimentally using surface enhanced Raman scattering (SERS) tests. In addition, the obtained structures had a photoelectrochemical response useful for catalyzing the CO 2 electroreduction reaction. Our work demonstrates the next generation of complex plasmonic nanostructures attainable via bottom-up synthesis and offers a variety of potential applications ranging from sensing to catalysis.
Bibliographical noteFunding Information:
We thank the University of Waterloo and the Natural Sciences and Engineering Research Council of Canada (Discovery Grant) for the financial support of this work. A. K. thanks I. Gourevich (Centre for Nanostructure Imaging at the Department of Chemistry, University of Toronto) for the help with SEM imaging, and P. Radovanovic for the use of the UV-Vis-NIR spectrophotometer. E. K. thanks the Russian Science Foundation (grant 18-79-00144). A. A. thanks the California State University Long Beach for financial support.
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