Adverse Role of Shape and Size in Second-Harmonic Scattering from Gold Nanoprisms

Nadolski, Krzysztof; Bénichou, Emmanuel; Tarnowicz-Staniak, Nina; Żak, Andrzej; Jonin, Christian; Matczyszyn, Katarzyna; Brevet, Pierre‐François

doi:10.1021/acs.jpcc.0c03489

Cited by 7 publications

(7 citation statements)

References 39 publications

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“…In this report, Hyper Rayleigh Scattering (HRS), the incoherent scattering of SHG light, is investigated for an aqueous suspension of 50 nm diameter AuNPs to assess the sensing potential toward copper(II) ions. − The study entails the use of intensity and light polarization analysis of the scattered SHG intensity. Although the method in its details requires a close scrutiny of the nonlinear optical phenomenon, it appears that its setup into a sensing method remains accessible for a simple operation.…”

Section: Introductionmentioning

confidence: 99%

Sensing Copper(II) Ions with Hyper Rayleigh Scattering from Gold Nanoparticles

et al. 2023

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Incoherent Second Harmonic Generation (SHG) from gold nanoparticles, also known as hyper-Rayleigh scattering (HRS), is proposed as a sensing method for copper(II) ions. As opposed to colorimetry-based methods relying on the shift of the localized surface plasmon resonance with the copper(II) concentration, which effectively scales with the nanoparticle volume due to the origin of the absorption phenomenon, SHG relies on the surface origin of the response for sufficiently small nanoparticles. As a result, differences can be expected that could be potentially turned into advantages such as improved Limit of Detection and shorter detection response time. The present study demonstrates that the SHG light scattered from aqueous suspensions of gold nanoparticles in the presence of copper(II) ions is indeed sensitive to the copper(II) ion concentration changes. A first approach based on intensity changes shows that there is a competition between the formation of corona-like structures centered around the gold nanoparticles due to the ionic interaction between copper(II) ions and the negatively charged citrate-coated nanoparticles on one side and, on the other side, aggregation of nanoparticles due to charge screening as the copper(II) bromide concentration increases. The former process dominates at low copper(II) concentrations, whereas aggregation takes over above 1 mM copper(II) concentrations. A figure of merit is thus designed in order to provide a quantitative assessment of the sensing performance. In a further analysis, a polarization resolved study of the SHG light scattered from the gold nanoparticles allows the determination of other figures of merit. The first one based on the depolarization ratio seems appropriate, as it is based on the surface origin of the SHG response from gold nanoparticles, whereas the second one, based on the retardation parameter, should not perform better than those derived from colorimetry methods.

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Section: Introductionmentioning

confidence: 99%

Sensing Copper(II) Ions with Hyper Rayleigh Scattering from Gold Nanoparticles

et al. 2023

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“…12 This has been done for lithographed nanoprism arrangements with D3h symmetry 13,14 and for colloidal nanoprisms in solution. 15 Obtaining materials with an octupolar response is interesting, 16,17 both from a fundamental point of view and for applications, since the SHG intensity has a very characteristic polarization pattern.…”

Section: Introductionmentioning

confidence: 99%

“…This approach has been attempted, for instance, with heterogeneous NP dimers. − Another possibility is to develop the octupolar β (3) component with a 3-fold symmetry while maintaining a low dipole . This has been done for lithographed nanoprism arrangements with D 3 h symmetry , and for colloidal nanoprisms in solution . Obtaining materials with an octupolar response is interesting , both from a fundamental point of view and for applications, since the SHG intensity has a very characteristic polarization pattern.…”

Section: Introductionmentioning

confidence: 99%

Shape-Controlled Second-Harmonic Scattering from Gold Nanotetrapods

et al. 2022

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In the search for efficient building blocks for nonlinear metamaterials, plasmonic nanoparticles have received considerable attention. Their quadratic nonlinear optical properties result from a complex interplay between the nature of the bulk material, the object shape, surface defects and retardation effects. This versatility can be used to tailor the properties of the resulting material. However, despite extensive investigation, separating and controlling these contributions is still a challenge. In this report, we control the morphology of colloidal gold nanoparticles with tetrahedral symmetry and explore their second harmonic scattering response. The material itself is centrosymmetric but not the shape, conferring to the first hyperpolarizability an almost purely octupolar symmetry. Gradually reshaping the nanoparticles into spheres (and thus decreasing their asymmetry) reduces their nonlinear response, showing that it is is controlled by the morphology. These results open the way towards new kinds of nonlinear plasmonics platforms and imaging probes.

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“…A commonly used method to enhance the emission from fluorophores is a technique known as surface-enhanced fluorescence (SEF). It has been shown that plasmon supporting materials such as gold and silver can be used to boost the Raman and fluorescence signal by typically several orders of magnitude when the analyte molecule is positioned in close proximity to the metal (typically 10–90 nm from the surface). − The use of metal-based templates for the improved detection of biomolecules has several disadvantages; noble metals can be expensive, difficult to manufacture (lithography methods must be used to ensure reproducibility), lack biocompatibility (particularly in the case of silver), and may induce photocatalytic side reactions in analytes . For that reason, fabricating sensing platforms based on dielectric materials that can enhance the fluorescence signal strength from a fluorophore is of enormous interest.…”

Section: Introductionmentioning

confidence: 99%

Metal-Free Cellulose-Based Platforms for Biomolecule Fluorescence Signal Enhancement

Fularz

Almohammed

Rice

2021

ACS Sustainable Chem. Eng.

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Fluorescence is a rapid and noninvasive technique for analyte detection. Green, sustainable, and safe materials that enhance the analyte fluorescence signal possess the potential to create new green photonic technologies for medical diagnostics. Here, we report that metal-free cellulose-based substrates can be used as platforms to enhance the fluorescence signal from a model immunoassay as well as a wide variety of molecules by over an order of magnitude. The cellulose-based sensing platforms are costeffective, biocompatible, robust, and result in a reproducible signal variation as low as 16%. We show that molecules at concentrations as low as 100 nM can be detected on cellulose-based substrates. We attribute the observed enhancement to nanofiber-driven clustering of the analyte molecules, high surface roughness, as well as a charge-transfer process.

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Adverse Role of Shape and Size in Second-Harmonic Scattering from Gold Nanoprisms

Cited by 7 publications

References 39 publications

Sensing Copper(II) Ions with Hyper Rayleigh Scattering from Gold Nanoparticles

Sensing Copper(II) Ions with Hyper Rayleigh Scattering from Gold Nanoparticles

Shape-Controlled Second-Harmonic Scattering from Gold Nanotetrapods

Metal-Free Cellulose-Based Platforms for Biomolecule Fluorescence Signal Enhancement

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