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

Liebig, Ferenc; Sarhan, Radwan M.; Schmitt, Clemens N. Z.; Thünemann, Andreas F.; Prietzel, Claudia; Bargheer, Matias

doi:10.1002/cplu.201900745

Cited by 8 publications

(14 citation statements)

References 43 publications

(63 reference statements)

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“…At a low amount of HAuCL 4 in solution, individual spherical gold nanoparticles are formed at the platelet surface. By increasing amount of HAuCL 4, the individual gold nanoparticles welded partially into each other and crumble islands were formed, as seen in Figure 4 [32].…”

Section: Crumble Aunts After Replacing the Aot Bilayer By Hyaluronic mentioning

confidence: 95%

“…SERS spectra of 4-NTP molecules adsorbed on the smooth (bare) AuNTs in comparison to the crumble AuNTs demonstrate the strong enhancement effect due to the decoration with crumbles on the platelet surface (compare Figure 5) [32]. The corresponding EF = 5.6 × 10 5 was calculated one order higher in comparison to the smooth (bare) AuNTs [32]. After removing the excess HA and AOT molecules by centrifugation at 13,000 rpm, the resulting biocompatible smooth AuNTs can be used for further surface modification experiments.…”

Section: Crumble Aunts After Replacing the Aot Bilayer By Hyaluronic mentioning

confidence: 98%

Section: Crumble Aunts After Replacing the Aot Bilayer By Hyaluronic mentioning

confidence: 99%

“…By adding the negatively charged biopolymer HA, to the negatively charged AOT-based AuNTs, the negative zeta potential is decreased from −59 mV to −33 mV, which can be related to the substitution of the surfactant bilayer by the polymer HA (compare Scheme 3) [32]. After removing the excess HA and AOT molecules by centrifugation at 13,000 rpm, the resulting biocompatible smooth AuNTs can be used for further surface modification experiments.…”

Section: Crumble Aunts After Replacing the Aot Bilayer By Hyaluronic mentioning

confidence: 99%

“…substitution of the surfactant bilayer by the polymer HA (compare Scheme 3) [32]. After removing the excess HA and AOT molecules by centrifugation at 13,000 rpm, the resulting biocompatible smooth AuNTs can be used for further surface modification experiments.…”

Section: Crumble Aunts After Replacing the Aot Bilayer By Hyaluronic mentioning

confidence: 99%

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The Effect of Surface Modification of Gold Nanotriangles for Surface-Enhanced Raman Scattering Performance

Koetz

2020

Nanomaterials

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A surface modification of ultraflat gold nanotriangles (AuNTs) with different shaped nanoparticles is of special relevance for surface-enhanced Raman scattering (SERS) and the photo-catalytic activity of plasmonic substrates. Therefore, different approaches are used to verify the flat platelet morphology of the AuNTs by oriented overgrowth with metal nanoparticles. The most important part for the morphological transformation of the AuNTs is the coating layer, containing surfactants or polymers. By using well established AuNTs stabilized by a dioctyl sodium sulfosuccinate (AOT) bilayer, different strategies of surface modification with noble metal nanoparticles are possible. On the one hand undulated superstructures were synthesized by in situ growth of hemispherical gold nanoparticles in the polyethyleneimine (PEI)-coated AOT bilayer of the AuNTs. On the other hand spiked AuNTs were obtained by a direct reduction of Au3+ ions in the AOT double layer in presence of silver ions and ascorbic acid as reducing agent. Additionally, crumble topping of the smooth AuNTs can be realized after an exchange of the AOT bilayer by hyaluronic acid, followed by a silver-ion mediated reduction with ascorbic acid. Furthermore, a decoration with silver nanoparticles after coating the AOT bilayer with the cationic surfactant benzylhexadecyldimethylammonium chloride (BDAC) can be realized. In that case the ultraviolet (UV)-absorption of the undulated Au@Ag nanoplatelets can be tuned depending on the degree of decoration with silver nanoparticles. Comparing the Raman scattering data for the plasmon driven dimerization of 4-nitrothiophenol (4-NTP) to 4,4′-dimercaptoazobenzene (DMAB) one can conclude that the most important effect of surface modification with a 75 times higher enhancement factor in SERS experiments becomes available by decoration with gold spikes.

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Section: Crumble Aunts After Replacing the Aot Bilayer By Hyaluronic mentioning

confidence: 95%

Section: Crumble Aunts After Replacing the Aot Bilayer By Hyaluronic mentioning

confidence: 98%

Section: Crumble Aunts After Replacing the Aot Bilayer By Hyaluronic mentioning

confidence: 99%

Section: Crumble Aunts After Replacing the Aot Bilayer By Hyaluronic mentioning

confidence: 99%

Section: Crumble Aunts After Replacing the Aot Bilayer By Hyaluronic mentioning

confidence: 99%

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The Effect of Surface Modification of Gold Nanotriangles for Surface-Enhanced Raman Scattering Performance

Koetz

2020

Nanomaterials

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Dual‐Mode Operando Raman Spectroscopy and Upconversion Thermometry for Probing Thermal Contributions to Plasmonic Photocatalysis

Bommidi

Pickel

2023

Advanced Optical Materials

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Operando thermometry can help resolve open questions about the importance of thermal contributions to plasmonic photocatalysis, but identifying high‐fidelity thermometers with the requisite chemical inertness, thermal stability, and spatial resolution remains challenging. Here, it is demonstrated that a single near‐infrared laser can simultaneously excite upconverting nanoparticles (UCNPs) that serve as luminescent thermometers and photocatalyze the dimerization of 4‐nitrothiophenol (4‐NTP), which is employed as a model reaction. Due to its large anti‐Stokes shift, the UCNP thermometry signal naturally separates from the 4‐NTP Raman signal, which is used to monitor the chemical reaction, in the spectral domain. The surface temperature rise of plasmonic substrates under varying illumination intensity is systematically correlated with the reaction progress. Temperature rises exceeding 40 K are recorded at the maximum intensity used, yet lower intensities combined with external heating to achieve the same temperature rise are shown to catalyze the reaction less effectively. Furthermore, measurements performed using equivalent external heating and an intensity too low to photocatalyze the reaction display no evidence of the reaction occurring. By providing high‐fidelity operando surface temperature measurements, this method offers a valuable tool for elucidating thermal contributions to plasmonic photocatalysis.

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Surface coverage and adsorption properties of 1-vinyl-1,2,4-triazole on Au(111) surface: a molecular dynamics study

Meltonyan,

Poghosyan,

Sargsyan

2023

J Mol Model

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

Cited by 8 publications

References 43 publications

The Effect of Surface Modification of Gold Nanotriangles for Surface-Enhanced Raman Scattering Performance

The Effect of Surface Modification of Gold Nanotriangles for Surface-Enhanced Raman Scattering Performance

Dual‐Mode Operando Raman Spectroscopy and Upconversion Thermometry for Probing Thermal Contributions to Plasmonic Photocatalysis

Surface coverage and adsorption properties of 1-vinyl-1,2,4-triazole on Au(111) surface: a molecular dynamics study

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