Synthesis of Complex Nanoparticles
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Highly Complex Plasmonic Nanoparticles
Plasmonic nanoframes (NFs) with complex architectures enable exceptional near-field focusing. By employing a series of chemical steps including selective etching and regrowth, we fabricate advanced NFs with precisely controlled geometries and multiple intra-nanogaps, achieving remarkable plasmonic enhancements.
Web Nanostructures
Synthetic strategies for creating web-above-a-ring and web-above-a-lens nanostructures are reported. The web-above-a-ring structure features a controllable gap between the Pt@Au nanoring core and a nanoporous nanoweb, effectively confining the electromagnetic field within the nanogap and enhancing Raman scattering signals of dyes with high reproducibility, due to the formation of circular three-dimensional hot zones along the rim of the nanorings. In the web-above-a-lens structure, plasmonic hot zones, nanopores, and hot lenses are integrated within a single nanostructure, synergistically amplifying Raman scattering signals.
Multi-Layered Pt-Au Nanoframes
The rational design of complex PtAu double nanoframes for enhanced electrocatalytic activity in the methanol oxidation reaction is reported. The nanoframes are synthesized through a controlled process involving Au growth, selective Pt deposition, and Au etching, resulting in nested octahedral and truncated octahedral nanoframes with tunable intra-nanogap distances. Residual Au atoms on Pt skeletons create plasmonic hot spots that enhance electrocatalytic activity, with the highest activity achieved at the narrowest gap, while triple nanoframes with dense hot regions exhibit a sixfold increase in current density under light irradiation compared to dark conditions.
Solid-in-frame Nanoparticle
The synthesis of a plasmonic particle-in-a-frame architecture is described, where a solid Au octahedron is enclosed within a Au cubic nanoframe, creating intra-nanogaps within the structure. The sharp vertexes of the Au octahedron point toward the open (100) facets of the cubic nanoframe, enabling efficient interactions with the surroundings and enhanced electromagnetic near-field focusing through intraparticle coupling. This core-frame architecture generates concentrated hot spots, facilitating highly sensitive detection of 2-naphthalenethiol and thiram, making it suitable for surface-enhanced Raman spectroscopy applications.
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