Spiked gold nanotriangles: formation, characterization and applications in surface-enhanced Raman spectroscopy and plasmon-enhanced catalysis

Liebig, Ferenc; Sarhan, Radwan M.; Bargheer, Matias; Schmitt, Clemens N. Z.; Poghosyan, Armen H.; Shahinyan, Aram A.; Koetz, Joachim

doi:10.1039/d0ra00729c

Cited by 24 publications

(18 citation statements)

References 60 publications

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Section: Spiked Aunts Formed In the Aot Bilayermentioning

confidence: 86%

“…EDX measurements reveal that the spikes contain both noble metals, i.e., gold (80%) and silver (20%). The Au spikes are surrounded by a silver layer [41] in similarity to nanostars synthesized under similar conditions in a concentrated AOT solution [39]. In a first step, the Au 3+ and Ag + ions turn to the negatively charged AOT bilayer, before ascorbic acid molecules attach to the bilayer surface, visualized by corresponding MD simulations [41].…”

Section: Spiked Aunts Formed In the Aot Bilayermentioning

confidence: 95%

“…The Au spikes are surrounded by a silver layer [41] in similarity to nanostars synthesized under similar conditions in a concentrated AOT solution [39]. In a first step, the Au 3+ and Ag + ions turn to the negatively charged AOT bilayer, before ascorbic acid molecules attach to the bilayer surface, visualized by corresponding MD simulations [41]. Therefore, the reduction process of Au 3+ ions is realized in the AOT shell under similar experimental conditions, used for the gold nanostar synthesis [39].…”

Section: Spiked Aunts Formed In the Aot Bilayermentioning

confidence: 99%

“…TEM of a spiked AuNT with Raman spectra of smooth (bare in black) and spiked AuNTs (in red) at a laser power of 2 mW. Adapted from reference[41].…”

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: Spiked Aunts Formed In the Aot Bilayermentioning

confidence: 86%

Section: Spiked Aunts Formed In the Aot Bilayermentioning

confidence: 95%

Section: Spiked Aunts Formed In the Aot Bilayermentioning

confidence: 99%

“…TEM of a spiked AuNT with Raman spectra of smooth (bare in black) and spiked AuNTs (in red) at a laser power of 2 mW. Adapted from reference[41].…”

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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“…Electrosynthesis and study of the properties of functional polymers and on this basis obtained nanomaterials, is the most rapidly developing area of modern chemical science. As noted in [2][3][4][5][6][7][8][9][10][11][12], nanomaterials are used in medicine as antibacterial drugs, systems for targeted delivery of contrast agents and drugs, biosensors, and other biomedical purposes.…”

Section: Introductionmentioning

confidence: 99%

Electrosynthesis of gold nanocomposites based on copolymer of 1-vinyl-1,2,4-triazol with crotonic acid

Sargsyan

Agadjanyan

et al. 2022

J. Electrochem. Sci. Eng.

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In this work, we have synthesized and discussed the results of electrosynthesis of metal-polymer nanocomposites of gold. Nanocoatings were made on pure iron and steel electrodes by combining the process of electropolymerization of 1-vinyl-1.2.4-triazole with crotonic acid and cathodic deposition of gold. Using UV, IR and atomic absorption spectroscopies, X-ray phase analysis, as well as thermogravimetric and elemental analyses, the structure and composition of the synthesized nanocomposites and nanocomposite coatings were studied.

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Interrelated Roles of Multiple Key Structure‐Directing Agents in Seed‐Mediated Growth of Monodisperse and Multibranched Au Nanoparticles

et al. 2023

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Detailed mechanistic investigations of the interrelated roles of multiple key structure‐directing agents in the growth solution of Au nanoparticles (AuNPs) is required for the optimization of synthetic protocols. Here, we report a robust seed‐mediated growth strategy for synthesizing multibranched NPs (MB‐AuNPs) with monodispersed size distribution, and investigate the roles of Ag ions and 4‐(2‐hydroxyethyl)piperazine‐1‐ethanesulfonic acid (HEPES) based on an overgrowth synthesis approach. The intertwining roles of Ag+, surface‐capping stabilizers, and reducing agents were elucidated, and used to control the morphology of MB‐AuNPs. The overgrowth of MB‐AuNPs involves two distinct underlying pathways, namely, directional and anisotropic growth of Au branches on specific facets of Au seeds as well as an aggregation and growth mechanism governed by HEPES. In addition to Ag ions and HEPES, morphology tunability can also be achieved by pre‐modification of the Au seeds with molecular probes. Optimized probe‐containing MB‐AuNPs prove to be excellent surface‐enhanced Raman scattering (SERS) substrates and nanozymes. Taken together, the results of this work reveal the mechanistic evolution of nanocrystal growth which should stimulate the development of new synthetic strategies, improve the capabilities of tuning the optical, catalytic, and electronic properties of NPs, and further advance their applications in biolabeling, imaging, biosensing, and therapy.

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Spiked gold nanotriangles: formation, characterization and applications in surface-enhanced Raman spectroscopy and plasmon-enhanced catalysis

Abstract: We show the formation of metallic spikes on the surface of gold nanotriangles (AuNTs) by using the same reduction process which has been used for the synthesis of gold nanostars leading to a higher SERS enhancement by a factor of 75.

Cited by 24 publications

References 60 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

Electrosynthesis of gold nanocomposites based on copolymer of 1-vinyl-1,2,4-triazol with crotonic acid

Interrelated Roles of Multiple Key Structure‐Directing Agents in Seed‐Mediated Growth of Monodisperse and Multibranched Au Nanoparticles

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