ArticleNanomaterials (Basel, Switzerland)2020
Gold Nanorod Assemblies: The Roles of Hot-Spot Positioning and Anisotropy in Plasmon Coupling and SERS.
Article in Nanomaterials (Basel, Switzerland), 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.
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12 citing papers in PubMed, 39 citations in OpenAlex.
- Nanomaterials for Surface Enhanced Raman Spectroscopy.Nanomaterials (Basel, Switzerland) · 2023Article
- Au nanorod assembly for sensitive SERS detection of airway inflammatory factors in sputum.Frontiers in bioengineering and biotechnology · 2023Article
- Multi-Effect Enhanced Raman Scattering Based on Au/ZnO Nanorods Structures.Nanomaterials (Basel, Switzerland) · 2022Article
- Gold Nanorod-Incorporated Halloysite Nanotubes Functionalized with Antibody for Superior Antibacterial Photothermal Treatment.Pharmaceutics · 2022Article
- Label-Free Detection of DNA via Surface-Enhanced Raman Spectroscopy Using Au@Ag Nanoparticles.Nanomaterials (Basel, Switzerland) · 2022Article
- Surface enhanced deep Raman detection of cancer tumour through 71 mm of heterogeneous tissue.Nanotheranostics · 2022Article
- Article
- Numerical Modelling of the Optical Properties of Plasmonic and Latex Nanoparticles to Improve the Detection Limit of Immuno-Turbidimetric Assays.Nanomaterials (Basel, Switzerland) · 2021Article
- Interfacial interactions of SERS-active noble metal nanostructures with functional ligands for diagnostic analysis of protein cancer markers.Mikrochimica acta · 2021Review
- An overview of surface-enhanced Raman scattering substrates by pulsed laser deposition technique: fundamentals and applications.Advanced composites and hybrid materials · 2021Review
- Improved Charge Transfer Contribution by Cosputtering Ag and ZnO.Nanomaterials (Basel, Switzerland) · 2020Article
- Diagnostic prospects and preclinical development of optical technologies using gold nanostructure contrast agents to boost endogenous tissue contrast.Chemical science · 2020Review
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Authors and funding
3 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Plasmon-coupled colloidal nanoassemblies with carefully sculpted "hot-spots" and intense surface-enhanced Raman scattering (SERS) are in high demand as photostable and sensitive plasmonic nano-, bio-, and chemosensors. When maximizing SERS signals, it is particularly challenging to control the hot-spot density, precisely position the hot-spots to intensify the plasmon coupling, and introduce the SERS molecule in those intense hot-spots. Here, we investigated the importance of these factors in nanoassemblies made of a gold nanorod (AuNR) core and spherical nanoparticle (AuNP) satellites with ssDNA oligomer linkers. Hot-spot positioning at the NR tips was made possible by selectively burying the ssDNA in the lateral facets via controlled Ag overgrowth while retaining their hybridization and assembly potential at the tips. This strategy, with slight alterations, allowed us to form nanoassemblies that only contained satellites at the NR tips, i.e., directional anisotropic nanoassemblies; or satellites randomly positioned around the NR, i.e., nondirectional nanoassemblies. Directional nanoassemblies featured strong plasmon coupling as compared to nondirectional ones, as a result of strategically placing the hot-spots at the most intense electric field position of the AuNR, i.e., retaining the inherent plasmon anisotropy. Furthermore, as the dsDNA was located in these anisotropic hot-spots, this allowed for the tag-free detection down to 10 dsDNA and a dramatic SERS enhancement of 1.6 × 10
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