Undulated Gold Nanoplatelet Superstructures: In Situ Growth of Hemispherical Gold Nanoparticles onto the Surface of Gold Nanotriangles

Liebig, Ferenc; Sarhan, Radwan M.; Prietzel, Claudia; Thünemann, Andreas F.; Bargheer, Matias; Koetz, Joachim

doi:10.1021/acs.langmuir.7b02898

Cited by 22 publications

(25 citation statements)

References 61 publications

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“…An additional spectroscopic proof by EDX measurements is not possible, because of the coincidence of sulfur and gold peaks in the EDX spectrum. [14a] The desorption of the AOT-bilayer by adding HA is quite different to our former experiments by coating the AOT-bilayer with the cationic polyelectrolyte polyethyleneimine (PEI) [15] or the cationic surfactant benzylhexadecyldimethylammonium chloride (BDAC). [16] In both cases we observed a shift of the zeta potential to a positive value of + 12 mV and + 41 mV, respectively.…”

Section: Ha-stabilized Gold Nanotrianglesmentioning

confidence: 83%

“…where b represents a constant background. We applied this simple model earlier for quantification of undulated gold nanoplatelets . The Guinier approximation of sheet‐like structures can be applied to the nanotriangles because the edge length of about 175 nm is much larger than the thickness of 7.5±1.5 nm (bare nanotriangles) as Equation

true I_{G u i n i e r} ((), q) = \frac{2 π}{q^{2}} Δ μ prefixexp ((), - R_{d}^{2} q^{2})

…”

Section: Resultsmentioning

confidence: 99%

“…[16] In both cases we observed a shift of the zeta potential to a positive value of + 12 mV and + 41 mV, respectively. [15,16] In case of BDAC coating we were able to identify sulfur by EDX measurements at the periphery of the triangles, [16] indicating the layer-by-layer formation.…”

Section: Ha-stabilized Gold Nanotrianglesmentioning

confidence: 87%

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Gold Nanotriangles with Crumble Topping and their Influence on Catalysis and Surface‐Enhanced Raman Spectroscopy

et al. 2020

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By adding hyaluronic acid (HA) to dioctyl sodium sulfosuccinate (AOT)‐stabilized gold nanotriangles (AuNTs) with an average thickness of 7.5±1 nm and an edge length of about 175±17 nm, the AOT bilayer is replaced by a polymeric HA‐layer leading to biocompatible nanoplatelets. The subsequent reduction process of tetrachloroauric acid in the HA‐shell surrounding the AuNTs leads to the formation of spherical gold nanoparticles on the platelet surface. With increasing tetrachloroauric acid concentration, the decoration with gold nanoparticles can be tuned. SAXS measurements reveal an increase of the platelet thickness up to around 14.5 nm, twice the initial value of bare AuNTs. HRTEM micrographs show welding phenomena between densely packed particles on the platelet surface, leading to a crumble formation while preserving the original crystal structure. Crumbles crystallized on top of the platelets enhance the Raman signal by a factor of around 20, and intensify the plasmon‐driven dimerization of 4‐nitrothiophenol (4‐NTP) to 4,4′‐dimercaptoazobenzene in a yield of up to 50 %. The resulting crumbled nanotriangles, with a biopolymer shell and the absorption maximum in the second window for in vivo imaging, are promising candidates for biomedical sensing.

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Section: Ha-stabilized Gold Nanotrianglesmentioning

confidence: 83%

true I_{G u i n i e r} ((), q) = \frac{2 π}{q^{2}} Δ μ prefixexp ((), - R_{d}^{2} q^{2})

…”

Section: Resultsmentioning

confidence: 99%

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Gold Nanotriangles with Crumble Topping and their Influence on Catalysis and Surface‐Enhanced Raman Spectroscopy

et al. 2020

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“…Metal overgrowth can increase surface roughness by forming bumpy structures [97] or undulated surfaces [98], which both showed increased SERS activity. At the same time, metal overgrowth can increase the chemical stability of NPs.…”

Section: Functional Shells For Augmented Sers Applicationsmentioning

confidence: 99%

Plasmonics in Sensing: From Colorimetry to SERS Analytics

Kuttner¹

2018

Plasmonics

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This chapter gives a brief overview of plasmonic nanoparticle (NP)-based sensing concepts ranging from classical spectral-shift colorimetry to the highly active field of surface-enhanced Raman scattering (SERS) spectroscopy. In the last two decades, colloidal approaches have developed significantly. This is seen with, for example, refractive-index sensing, detection of ad−/desorption and ligand-exchange processes, as well as ultrasensitive chemical sensing utilizing well-defined nanocrystals or discrete self-assembled superstructures in 2D and 3D. Apart from individual NPs, the rational design of self-assembled nanostructures grants spectroscopic access to unprecedented physicochemical information. This involves selected research examples on molecular trapping, ligand corona analysis, SERS-encoding, and biosensing. The origin of the SERS effect, also in regard to hot spot formation by off-resonant excitation, is reviewed and discussed in the context of the current challenge to formulate a generalized metric for high SERS efficiency. Special emphasis lies in addressing the fundamental design criteria and the specific challenges of these particle-based sensing techniques.

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“…as SERS-encoded tags, 8,9 cellular imaging, 10 or biomarker detection. 11 Strategies for high SERS brightness include spiky 12 and undulated particle surfaces, 13,14 as well as cluster-encasing 15 and multilayer adsorption 16 of smaller particles on a central core NP. Assemblies consisting of a larger core NP surrounded by a monolayer of smaller NPs are commonly referred to as core/ satellite superstructures.…”

Section: Introductionmentioning

confidence: 99%

SERS and plasmonic heating efficiency from anisotropic core/satellite superstructures

et al. 2019

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Undulated Gold Nanoplatelet Superstructures: In Situ Growth of Hemispherical Gold Nanoparticles onto the Surface of Gold Nanotriangles

Cited by 22 publications

References 61 publications

Gold Nanotriangles with Crumble Topping and their Influence on Catalysis and Surface‐Enhanced Raman Spectroscopy

Gold Nanotriangles with Crumble Topping and their Influence on Catalysis and Surface‐Enhanced Raman Spectroscopy

Plasmonics in Sensing: From Colorimetry to SERS Analytics

SERS and plasmonic heating efficiency from anisotropic core/satellite superstructures

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