Fabrication of Periodic Arrays of Highly Oriented Plasmonic Heterotrimers via Site-Specific Sequential Colloidal Assembly.
basic_science · Level V
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- Record sourced from PubMed, PMID 40340389.
- Also identified by DOI 10.1021/acs.nanolett.5c01376.
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Abstract
Plasmonic nanoarrays show applications in biosensors, nanolasers, and photodetectors, but precisely organizing and orienting nanoparticle (NP) trimers on substrates remains a grand challenge. Here, we present a self-assembly strategy to arrange metallic NPs with distinct diameters into centimeter-scale arrays of highly oriented linear trimers by modulating the balance between capillary forces and coordination-electrostatic interactions. We achieved an 88% yield of plasmonic trimers with ±10° orientation uniformity across 1 cm<sup>2</sup> substrates by optimizing the ionic strength of the NP solutions. The high uniformity and sub-3-nm interparticle gaps of trimers in arrays enabled the collective polarization-dependent optical responses and high-order plasmonic coupling. Our strategy offers a versatile platform for creating complex nanostructure arrays with heterogeneous assemblies for use in plasmonic devices.