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Article Dans Une Revue Advanced Materials Année : 2022

Nanocube epitaxy for the realisation of printable monocrystalline nanophotonic surfaces

Résumé

Plasmonic nanoparticles of the highest quality can be obtained via colloidal synthesis at low-cost. Despite the strong potential for integration in nanophotonic devices, the geometry of colloidal plasmonic nanoparticles is mostly limited to that of Platonic solids. This is in stark contrast to nanostructures obtained by top-down methods, that o↵er unlimited capability for plasmon resonance engineering, but present poor material quality and have doubtful perspectives for scalability. Here, we introduce an approach that combines the best of the two worlds by transforming assemblies of single-crystal gold nanocube building blocks into continuous monocrystalline plasmonic nanostructures with an arbitrary shape, via epitaxy in solution at near ambient temperature. We used nanocube dimers as a nanoreactor model system to investigate the mechanism in operando. Measuring the collective optical response of ⇠40 nanocube reactors revealed competitive redox processes of oxidative etching at the nanocube corners and simultaneous heterogeneous nucleation at their surface, that ensure the filling of the sub-nanometer gap in a self-limited manner. Tuning the experimental parameters (temperature, pH, halide concentration) proved e↵ective in controlling the morphology of the resulting monocrystalline nanostructures from (100) to (111) capping facets. Applying this procedure to nanocube arrays assembled in a patterned polydimethylsiloxane (PDMS) substrate, we are able to obtain printable monocrystalline nanoantenna arrays that can be swiftly integrated in devices. This could lead to the implementation of low cost nanophotonic surfaces of the highest quality in industrial products.
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Dates et versions

hal-03538271 , version 1 (26-01-2022)
hal-03538271 , version 2 (31-03-2022)

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Anna Capitaine, Beniamino Sciacca. Nanocube epitaxy for the realisation of printable monocrystalline nanophotonic surfaces. Advanced Materials, 2022, ⟨10.1002/adma.202200364⟩. ⟨hal-03538271v2⟩
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