Multiscale Patterned Plasmonic Arrays for Highly Sensitive and Uniform SERS Detection

Abstract

The ability to rationally manipulate plasmonic nanoparticles into well‐defined hierarchically patterned arrays is crucial for exploiting the property of novel optical metamaterials and is of significance for designing plasmonic devices. Before the benefits offered by hybridized plasmon modes may be fully utilized in practice, programmable plasmonic nanostructures with preset morphology and composition should be developed in advance. However, it remains a grand challenge to fabricate large‐area patterned array with highly ordered nanostructure in a low‐expertise and straightforward route. Here, high‐throughput fabrication of multiscale patterned plasmonic arrays of macroscopic surfaces and nanoscale ordering is reported. The bottom‐up ligand‐guided crystallization of nanoparticles takes place upon drying‐mediated self‐assembly at air/solution/substrate interfaces, while the macroscopic topography is regulated by rational control over local nucleation in microwrinkles. Using bimetallic nanobricks as meta‐atoms, it is demonstrated that the configuration of patterned arrays can be finely engineered as required by simply customizing the wrinkled template. It is also proved that the fabricated plasmonic arrays exhibit nearly uniform hot‐spot distribution across the entire surface, which makes them as practical substrates for the surface‐enhanced Raman scattering (SERS) applications. This facile yet efficient methodology suggests a versatile step toward the fabricating of hierarchically patterned architectures for practical device construction.

1D Colloidal chains: recent progress from formation to emergent properties and applications

“…Hence, colloidal chains are usually assembled into higher ordered 2D arrays by various methods for high-sensitive detection. [631][632][633] Chiroptical properties. Chiroptical properties in 1D colloidal chains arise from either chiral building blocks or chiral arrangement of achiral building blocks.…”

“…25c). 630,632,633 Moreover, the high sensitivity of colloidal chains may simply come from geometrically enhanced multiple docking sites or active centers compared to discrete NPs. 696,697 This superiority is especially outstanding when two or more components are needed together to accomplish detection because of an increasing number of heterojunctions integrated in the chains of binary building blocks (Fig.…”

Gold Nanopolyhedron-Based Superlattice Sheets as Flexible Surface-Enhanced Raman Scattering Sensors for Detection of 4-Aminothiophenol

“…High-efficient ligand modification and exchange are prerequisites for the self-assembly of plasmonic sheets, which is performed by following the two-step procedures established by our group. , As- prepared CPC-capped AuNPHs (10 mL) was centrifuged at 4 000 rpm for 10 min and finally concentrated with volume of 0.1 mL. Then, the concentrated AuNPHs was added into 4 mL HS-PS solution.…”

“…25 However, it has proven to be remarkably difficult to build highquality superlattices with macroscopic scale while maintaining nanoscopic ordering due to the complex interparticle forces during self-assembly. 26 State-of-the-art assembly methodologies have been explored to build plasmonic architectures, leading to various multidimensional nanomaterials with unique structures and properties, such as "plasmonic oligomers", 27 "polymer-like chains/ patterned arrays" 28 and "superlattice crystals", 29 on-demand dynamic nanostructures, 30 etc. Among those nanoarchitectures, two-dimensional (2D) plasmonic membrane has drawn significant attention due to its intrinsic geometric ordering, programmable optoelectronic property, and facile transfer for device integration.…”

“…State-of-the-art assembly methodologies have been explored to build plasmonic architectures, leading to various multidimensional nanomaterials with unique structures and properties, such as “plasmonic oligomers”, “polymer-like chains/patterned arrays” and “superlattice crystals”, on-demand dynamic nanostructures, etc. Among those nanoarchitectures, two-dimensional (2D) plasmonic membrane has drawn significant attention due to its intrinsic geometric ordering, programmable optoelectronic property, and facile transfer for device integration. ,,, Various strategies have been developed to fabricate the plasmonic superlattice membrane, mainly by utilizing bottom-up self-assembly and top-down guided methods. , During the self-assembly process, soft ligands that are functionalized around the pristine nanocrystals play a tremendous role in balancing the complex forces.…”