Plate-Like Colloidal Metal Nanoparticles

Scarabelli, Leonardo; Sun, Muhua; Zhuo, Xiaolu; Yoo, Sungjae; Millstone, Jill E.; Jones, Matthew R.; Liz‐Marzán, Luis M.

doi:10.1021/acs.chemrev.3c00033

Cited by 41 publications

(33 citation statements)

References 532 publications

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“…In the growth solution, as with seed synthesis, the selected reductant, pH, surfactant, halides, solvent, and silver salts all act to promote growth along specific crystal facets . Undoubtedly, there are many “handles” for controlling shape-directed growth; comprehensive reviews of each of these aspects are available elsewhere. − ,, …”

Section: From Colloidal Synthesis To In Situ Growthmentioning

confidence: 99%

“…24 Undoubtedly, there are many "handles" for controlling shapedirected growth; comprehensive reviews of each of these aspects are available elsewhere. [21][22][23][24]140,159 In addition, colloidal satellite structures or systems studying the growth of nanoparticles on another host nanomaterial, such as nanoparticle-decorated nanoplatelets, nanotubes, or other colloidal supports, offer interesting possibilities for generating hybrid structures, which we discuss further in Section 2.2. 52,160−163 Furthermore, the translation of the synthetic rules from this literature, especially regarding the promotion of nucleation on the colloidal support, could be informative for further developing synthetic protocols whereby gold nanoparticles are grown on substrates.…”

Section: Seed-mediated Growthmentioning

confidence: 99%

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Direct Bottom-UpIn SituGrowth: A Paradigm Shift for Studies in Wet-Chemical Synthesis of Gold Nanoparticles

Vinnacombe‐Willson

Conti

Ştefancu³

et al. 2023

Chem. Rev.

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Plasmonic gold nanoparticles have been used increasingly in solid-state systems because of their applicability in fabricating novel sensors, heterogeneous catalysts, metamaterials, and thermoplasmonic substrates. While bottom-up colloidal syntheses take advantage of the chemical environment to control size, shape, composition, surface chemistry, and crystallography of the nanostructures precisely, it can be challenging to assemble nanoparticles rationally from suspension onto solid supports or within devices. In this Review, we discuss a powerful recent synthetic methodology, bottom-up in situ substrate growth, which circumvents time-consuming batch presynthesis, ligand exchange, and selfassembly steps by applying wet-chemical synthesis to form morphologically controlled nanostructures on supporting materials. First, we briefly introduce the properties of plasmonic nanostructures. Then we comprehensively summarize recent work that adds to the synthetic understanding of in situ geometrical and spatial control (patterning). Next, we briefly discuss applications of plasmonic hybrid materials prepared by in situ growth. Overall, despite the vast potential advantages of in situ growth, the mechanistic understanding of these methodologies remains far from established, providing opportunities and challenges for future research.

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Section: From Colloidal Synthesis To In Situ Growthmentioning

confidence: 99%

Section: Seed-mediated Growthmentioning

confidence: 99%

Direct Bottom-UpIn SituGrowth: A Paradigm Shift for Studies in Wet-Chemical Synthesis of Gold Nanoparticles

Vinnacombe‐Willson

Conti

Ştefancu³

et al. 2023

Chem. Rev.

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“…Statistical analysis of the micrographs showed that the diameter of particles is 20–25 nm and the thickness is 5–10 nm. This allows us to classify them as nanoplates …”

Section: Resultsmentioning

confidence: 99%

Anti-Alzheimer Drug Delivery via Pickering Emulsions Stabilized by Plate-like Cellulose Nanocrystals

Mikhaylov,

Torlopov,

Vaseneva

et al. 2023

Langmuir

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In this work, we studied for the first time the formation of olive oil emulsions in water stabilized by plate-like nanocrystals with the supramolecular structure of cellulose II (pCNC). Effects of storage, pCNC concentration, and NaCl on the stability and properties of Pickering emulsions, including the creaming index, droplet size, zeta potential, acid−base surface properties, and rheology, were studied. A significant influence of the shape of nanoparticles (compared to the classical rod-like shape) on the stability parameters and rheological characteristics of emulsions is shown. Plate-like cellulose nanocrystals at a concentration of 16 g/L are able to form delamination-resistant emulsions without added electrolytes. The viscosity of pCNC-stabilized emulsions tends to decrease with increasing electrolyte concentration in the system, which is not characteristic of rod-like CNC-stabilized emulsions. This effect in pCNC-stabilized emulsions assumedly can be associated both with weak mechanical engagement between drops due to the shape of stabilizer particles and with an insignificant participation of background electrolyte cations in the formation of interdroplet interactions. Therefore, the resulting aggregates are unstable and easily destroyed, even under weak mechanical stress. As a consequence, the acid−base properties of the pCNC surface are practically independent of the emulsion preparation method (with or without electrolyte) as well as the concentration of the background electrolyte. The reduced viscosity of pCNC-stabilized emulsions in the presence of an electrolyte, coupled with the absence of acute toxicity, allows us to recommend them as a convenient oral delivery system for fatsoluble, biologically active substances. Our emulsions carrying donepezil (an anti-Alzheimer drug) showed better performance than a solution of donepezil hydrochloride in preventing memory impairment tested on laboratory mice.

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“…Shape-controlled synthesis of metal nanocrystals offers a pathway to regulate their optical, catalytic, and biological properties. − This approach typically involves the use of capping agents, which selectively bind to specific facets to influence the atomic deposition rate or surface energy, thereby yielding nanocrystals with different aspect ratios or bounded by distinct facets. − The unique ability of capping agents to drive anisotropic growth makes a deep understanding of their roles essential for synthesizing metal nanomaterials with the desired shapes and properties. Often, these roles are inferred from the shape of the product synthesized.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Growth of Silver Nanocubes: The Role of Bromide Adsorption and Hydrophilic Polymers

Xu,

Hao,

Wiley

2023

Chem. Mater.

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The application of capping agents to modulate the colloidal synthesis of metal nanocrystals offers an effective avenue for shape control, but the roles of such agents are not yet completely understood. This study uses seed-mediated growth, single-crystal electrochemistry, and surface-enhanced Raman spectroscopy (SERS) to illuminate the roles of polyvinylpyrrolidone (PVP) and bromide (Br − ) in the anisotropic growth of Ag nanocubes. Synthetic results show that Ag nanocubes only form in the presence of both PVP and sufficiently high concentrations of Br − . Truncated octahedra form in the presence of PVP, and truncated cubes form in the presence of Br − alone. Electrochemical measurements indicate that elevated concentrations of Br − consistently passivate Ag(100) facets more than Ag(111) facets regardless of the presence of PVP. The critical condition for the growth of cubes, however, materializes only when both PVP and Br − are present, which sufficiently suppresses atomic deposition to Ag(100) relative to Ag(111). SERS measurements show that high concentrations of Br − displace PVP from Ag(100) and Ag( 111), but electrochemical measurements suggest PVP acts as a strong passivator under such conditions. We propose that the chemisorption of Br − beneath a physisorbed layer of PVP creates a unique condition for the growth of Ag nanocubes. Furthermore, our investigation points to a generalizable adsorption structure for the synthesis of {100}-faceted Ag nanocrystals, where Br − adsorption under other hydrophilic polymers can similarly guide the formation of Ag nanocubes. This study enhances our understanding of the synergistic roles of Br − and hydrophilic polymers in the controlled morphogenesis of Ag nanocrystals.

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Plate-Like Colloidal Metal Nanoparticles

Cited by 41 publications

References 532 publications

Direct Bottom-UpIn SituGrowth: A Paradigm Shift for Studies in Wet-Chemical Synthesis of Gold Nanoparticles

Direct Bottom-UpIn SituGrowth: A Paradigm Shift for Studies in Wet-Chemical Synthesis of Gold Nanoparticles

Anti-Alzheimer Drug Delivery via Pickering Emulsions Stabilized by Plate-like Cellulose Nanocrystals

Anisotropic Growth of Silver Nanocubes: The Role of Bromide Adsorption and Hydrophilic Polymers

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