Synthesis method of asymmetric gold particles

Jun, Bong‐Hyun; Murata, Michael M.; Hahm, Eunil; Lee, Luke P.

doi:10.1038/s41598-017-02485-7

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…Asymmetric plasmonic particles have attracted considerable attention in many fields of science over the past few years due to their unique optical properties beyond those shown by symmetric particles in nature. − Among them, Au split nanorings (SNRs) are attractive structures due to their capability to be optically excited when exposed to electromagnetic fields . Breaking the symmetry of the ring leads to the excitation of high-order surface plasmon modes besides dipole modes. − Further, sharp tips generated intrinsically with noncontinuous morphology and narrow nanogaps between two end-tips enhanced the electrical field of the incident electromagnetic wave, which resulted from high electron density on tips with high curvature. ,,− …”

Section: Resultsmentioning

confidence: 99%

Synthesis and Surface Plasmonic Characterization of Asymmetric Au Split Nanorings

et al. 2020

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In this Letter, a rational and stepwise method for the solution-phase synthesis of asymmetric Au split nanorings by adopting Au nanoprisms as a template has been demonstrated. The selective chemical etching of Au nanoprism tips activated the surface reactivity of edges and led to the selective deposition of Pt at the periphery of Au nanoplates. By controlling the total amount of Pt on the edges, different degrees of split Au@Pt nanorings were obtained; the subsequent Au coating around the Au@Pt scaffold eventually resulted in asymmetric Au hexagonal split nanorings. Their surface plasmonic features as a function of split degrees were investigated, including straight nanorods, bent nanorods, split nanorings, and full nanorings. The electrical field focusing using single-particle surface-enhanced Raman spectroscopy was evaluated under different polarization angles of the incident light for two different structures with the point gap and line gap between two arms.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Surface Plasmonic Characterization of Asymmetric Au Split Nanorings

et al. 2020

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“…have been precisely synthesized and employed as high-performance SERS substrates. Among these structures, 3-D structures like stars, − dendrites, , and flowers, − show outstanding performance when used as SERS substrates because they possess high-density hotspots, which can generate a strong enough intensity of the electromagnetic field . Therefore, compared to nanoparticles, the controllable synthesis of high-yield 3-D plasmonic structures is of significance for robust SERS applications.…”

Section: Introductionmentioning

confidence: 99%

High-Yield Gold Nanohydrangeas on Three-Dimensional Carbon Nanotube Foams for Surface-Enhanced Raman Scattering Sensors

Yang

Zhang²,

Miao³

et al. 2023

ACS Omega

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Recently, carbon nanomaterial-supported plasmonic nanocrystals used as high-performance surface-enhanced Raman scattering (SERS) substrates have attracted increasing attention due to their ultra-high sensitivity of detection. However, most of the work focuses on the design of 2-D planar substrates with traditional plasmonic structures, such as nanoparticles, nanorods, nanowires, and so forth. Here, we report a novel strategy for the preparation of high-yield Au nanohydrangeas on three-dimensional porous polydopamine (PDA)/polyvinyl alcohol (PVA)/carbon nanotube (CNT) foams. The structures and growth mechanisms of these specific Au nanocrystals are systematically investigated. PDA plays the role of both a reducing agent as well as an anchoring site for Au nanohydrangeas’ growth. We also show that the ratio of surfactant KBr to the gold precursor (HAuCl4) is key to obtain these structures in a manner of high production. Moreover, the substrate of the CNT foam–Au nanohydrangea hybrid can be employed as SERS sensors and can detect the analytes down to 10–9 M.

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Breaking plasmonic symmetry through the asymmetric growth of gold nanorods

Melendez

Barrow

Liu

et al. 2020

Optica

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The optoelectronic properties of asymmetric metal nanostructures are of current interest for applications in photonics, sensing, and catalysis. Here, we break the symmetry of the localized surface plasmon resonance of gold nanorods by selective overgrowth of a single tip via a high-yield ( > 80 % ) wet-chemical method. While optical spectroscopy exhibits a bathochromic shift of the nanoparticle plasmon resonance, cathodoluminescence and electron energy loss spectroscopy measurements reveal a breaking of the symmetry of the associated localized surface plasmon resonance mode, which results in the subwavelength concentration of electromagnetic energy. The simple, one-step postsynthetic modification allows control of nanoparticle structural parameters, and we demonstrate how the asymmetric energy redistribution leads to increases in the surface-enhanced Raman scattering of a model analyte attached to the surface of the nanostructures. The spatial localization of energy in these nanostructures may find applications in nanofocusing, nanoimaging, and light harvesting.

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Synthesis method of asymmetric gold particles

Cited by 3 publications

References 25 publications

Synthesis and Surface Plasmonic Characterization of Asymmetric Au Split Nanorings

Synthesis and Surface Plasmonic Characterization of Asymmetric Au Split Nanorings

High-Yield Gold Nanohydrangeas on Three-Dimensional Carbon Nanotube Foams for Surface-Enhanced Raman Scattering Sensors

Breaking plasmonic symmetry through the asymmetric growth of gold nanorods

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