Disentangling the effect of seed size and crystal habit on gold nanoparticle seeded growth

González‐Rubio, Guillermo; Oliveira, Thaís Milagres de; Altantzis, Thomas; Porta, Andrea La; Guerrero‐Martínez, Andrés; Bals, Sara; Scarabelli, Leonardo; Liz‐Marzán, Luis M.

doi:10.1039/c7cc06854a

Cited by 35 publications

(46 citation statements)

References 21 publications

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“…These synthetic conditions allowed us to achieve spherical Au NPs with 10±2 nm diameter (as determined with the TEM, Figure b) with a strong LSPR band centered at 520 nm (Figure c). This seed size is consistent with previous report of some of us, in which we show that spherical NPs with diameters 10–20 nm can be used for efficient synthesis of NTs . UV‐Vis measurements of the seed solution did not reveal any changes in the plasmonic behavior over the course of six days (when kept at 4 °C), indicating high stability.…”

Section: Resultssupporting

confidence: 92%

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Robust Synthesis of Gold Nanotriangles and their Self‐Assembly into Vertical Arrays

et al. 2019

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We report an efficient, seed‐mediated method for the synthesis of gold nanotriangles (NTs) which can be used for controlled self‐assembly. The main advantage of the proposed synthetic protocol is that it relies on using stable (over the course of several days) intermediate seeds. This stability translates into increasing time efficiency of the synthesis and makes the protocol experimentally less demanding (‘fast addition’ not required, tap water can be used in the final steps) as compared to previously reported procedures, without compromising the size and shape monodispersity of the product. We demonstrate high reproducibility of the protocol in the hands of different researchers and in different laboratories. Additionally, this modified seed‐mediated method can be used to produce NTs with edge lengths between ca. 45 and 150 nm. Finally, the high ‘quality’ of NTs allows the preparation of long‐range ordered assemblies with vertically oriented building blocks, which makes them promising candidates for future optoelectronic technologies.

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Section: Resultssupporting

confidence: 92%

“…Simultaneously, the triangular shape translates into a rich polymorphism of their self‐assembled structures . The growing interest in the use of triangular Au NPs requires detailed investigation and development of reliable and tunable methods for their synthesis, purification and self‐assembly …”

Section: Introductionmentioning

confidence: 99%

Robust Synthesis of Gold Nanotriangles and their Self‐Assembly into Vertical Arrays

et al. 2019

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“…Scanning electron microscopy (SEM) images were taken using a JEOL FE-SEM JSM-7900F (Akishima, Japan). The probes were prepared following the modified literature technique [ 38 ]. An amount of 1.8 mL of the AuNT suspension containing ca.…”

Section: Methodsmentioning

confidence: 99%

Time Optimization of Seed-Mediated Gold Nanotriangle Synthesis Based on Kinetic Studies

2021

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The synthesis of shape-anisotropic plasmonic nanoparticles such as gold nanotriangles is of increasing interest. These particles have a high potential for applications due to their notable optical properties. A key challenge of the synthesis is usually the low reproducibility. Even the optimized seed-based methods often lack in the synthesis yield or are labor- and time-consuming. In this work, a seed-mediated synthesis with high reproducibility is replicated in order to determine the necessary reaction time for each step. Online monitoring of the reaction mixtures by UV–VIS spectroscopy is used as a powerful tool to track the evolution of the synthesis. The kinetics of the individual stages is elucidated by real-time investigations. As a consequence, the complete synthesis could be optimized and can now be realized in a single day instead of three without any loss in the resulting sample quality.

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“…In this case, iodine ions are used as a shape-inducing agent that can strongly bind {111} facets and promote twinning during nanocrystal overgrowth ( Figure 4A,B). [28,38,66] These results were corroborated by relativistic ab initio thermodynamics calculations, suggesting that single-crystal gold nanoparticles (enclosed by {100} and {111} facets) are favored at sizes above 15 nm, while twinned ones (enclosed by {111} facets) would be more stable at smaller sizes. [67] A different scenario applies to the synthesis of pentatwinned anisotropic nanocrystals, which typically requires separation of twin formation from symmetry breaking and anisotropic growth.…”

Section: Twin-directed Symmetry Breakingmentioning

confidence: 65%

Surfactant‐Assisted Symmetry Breaking in Colloidal Gold Nanocrystal Growth

et al. 2020

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Colloidal anisotropic gold nanocrystals play a central role in the field of plasmonics owing to their tunable optical activity across a wide spectral range. However, achieving sufficient optical quality for practical implementation requires advanced synthetic protocols yielding gold nanocrystals with the desired morphology and plasmonic properties. This Minireview focuses on a fundamental step during the growth of anisotropic nanocrystals, namely symmetry breaking. In connection with thermodynamic and kinetic control of nanocrystal growth, we discuss the complex interplay between the role of seed morphology and that of surfactants, shape-directing additives and reducing agents. We revisit some iconic syntheses of anisotropic gold nanoparticles, including nanorods, nanotriangles, and nanobipyramids. Finally, we analyze the use of co-surfactants as an emerging strategy to disconnect the symmetry breaking event from the anisotropic growth process, overcoming current limitations in the synthesis of anisotropic gold nanocrystals. 2 3 4 5 6 7 8

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Disentangling the effect of seed size and crystal habit on gold nanoparticle seeded growth

Cited by 35 publications

References 21 publications

Robust Synthesis of Gold Nanotriangles and their Self‐Assembly into Vertical Arrays

Robust Synthesis of Gold Nanotriangles and their Self‐Assembly into Vertical Arrays

Time Optimization of Seed-Mediated Gold Nanotriangle Synthesis Based on Kinetic Studies

Surfactant‐Assisted Symmetry Breaking in Colloidal Gold Nanocrystal Growth

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