Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 36, Pages 18634-18641Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp405560t
Keywords
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Funding
- German Federal Ministry of Education and Research (BMBF) [03IS2101E]
- Max Planck Society
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Metallic nanostructures that sustain plasmonic resonances are indispensable ingredients for many functional devices. Whereas structures fabricated with top-down methods entail the advantage of a nearly unlimited control over all. plasmonic properties, they are in most cases unsuitable for a low cost fabrication on large surfaces; and eventually a truly nanometric size domain is difficult to reach due to limitations in the fabrication resolution. Although ordinary bottom-up techniques based on colloidal nanolithography promise to lift these limitations, they often suffer from their incapability to self-assemble nanoparticles at large surfaces and at a density necessary to observe effects that strongly deviate from those of isolated nanoparticles. Here, we rely on the application of sequential bottom-up fabrication steps to realize honeycomb structures from gold nanoparticles that show strong extinction bands in the near-infrared. The extraordinary properties are only facilitated by densely packing the nanoparticles into clusters with a finite size; causing the clusters to act as plasmonic macromolecules. These strongly interacting bottom-up materials with a deterministic geometry but fabricated by self-assembly might be of use in future sensing applications and in material platforms to mediate strong light-matter-interactions.
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