From flat to deep concave: an unusual mode of facet control

Yang, Shenghao; Zheng, Yonglong; He, Guangyu; Zhang, Mengmeng; Li, Hongyan; Wang, Yawen; Chen, Hongyu

doi:10.1039/d2cc01221a

Cited by 10 publications

(15 citation statements)

References 29 publications

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“…To further examine the ridge-valley competition, the HAuCl 4 concentration was varied while keeping the L-cysteine unchanged. It is expected that a higher HAuCl 4 concentration would lead to faster reduction, more imbalanced Au deposition, 7,20 and thus more prominent threads. When the concentration was decreased from the standard 0.050 mM (Fig.…”

Section: Effect Of L-cysteine and Haucl 4 On The Spiral Threadsmentioning

confidence: 99%

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Understanding the evolution of tunable spiral threads in homochiral Au nano-screws

Yang

Liu

et al. 2022

Inorg. Chem. Front.

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Section: Effect Of L-cysteine and Haucl 4 On The Spiral Threadsmentioning

confidence: 99%

“…4b). 20 A notable pattern of the ridges is that they are mainly aligned to three directions that differ by 120°. In the cases where the ridges merge with the neighboring ones, the alignment at the junctions obviously deviates from the main directions.…”

Section: Characteristics Of the Spiral Threadsmentioning

confidence: 99%

Understanding the evolution of tunable spiral threads in homochiral Au nano-screws

Yang

Liu

et al. 2022

Inorg. Chem. Front.

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“…On both Au nanoplates and Au nanorods, complex patterns of Au waves were observed, defying the common facet control as the lowest energy state. The waves in the latter case evolved to become continuous spiral threads around the Au nanorods (the homochiral nanoscrews).…”

Section: Active Surface Growthmentioning

confidence: 99%

“…In our investigation of L-cysteine induced growth modes, we realized that chiral ridges and walls may also arise from the active surface growth (Figure 7c). At elevated temperature (60 °C) in the presence of CTAB, 66 the fast ligand dynamics gives rise to facet control like weak ligands. However, there is a difference between the external Au(110) facets and the internal rough surface enclosed by the inward-tilting facets, which is likely driven by the active surface at the upper edges.…”

Section: Active Surface Growth In Colloidal Solutionmentioning

confidence: 99%

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Strong Ligand Control for Noble Metal Nanostructures

et al. 2023

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Conspectus Nanosynthesis is the art of creating nanostructures, with on-demand synthesis as the ultimate goal. Noble metal nanoparticles have wide applications, but the available synthetic methods are still limited, often giving nanospheres and symmetrical nanocrystals. The fundamental reason is that the conventional weak ligands are too labile to influence the materials deposition, so the equivalent facets always grow equivalently. Considering that the ligands are the main synthetic handles in colloidal synthesis, our group has been exploring strong ligands for new growth modes, giving a variety of sophisticated nanostructures. The model studies often involve metal deposition on seeds functionalized with a certain strong ligand, so that the uneven distribution of the surface ligands could guide the subsequent deposition. In this Account, we focus on the design principles underlying the new growth modes, summarizing our efforts in this area along with relevant literature works. The basics of ligand control are first revisited. Then, the four major growth modes are summarized as follows: (1) The curvature effects would divert the materials deposition away from the high-curvature tips when the ligands are insufficient. With ligands fully covering the seeds, the sparser ligand packing at the tips would then promote the initial nucleation thereon. (2) The strong ligands may get trapped under the incoming metal layer, thus modulating the interfacial energy of the core–shell interface. The evidence for embedded ligands is discussed, along with examples of Janus nanostructures arising from the synthetic control, including metal–metal, metal–semiconductor, and metal–C60 systems using a variety of ligands. (3) Active surface growth is an unusual mode with divergent growth rates, so that part of the emerging surface is inhibited, and the growth is focused onto a few active sites. With seeds attached to oxide substrates, the selective deposition at the metal–substrate interface produces ultrathin nanowires. The synthesis can be generally applied to grow Au, Ag, Pd, Pt, and hybrid nanowires, with straight, spiral, or helical structures, and even rapid alteration of segments via electrochemical methods. In contrast, active surface growth for colloidal nanoparticles has to be more carefully controlled. The rich growth phenomena are discussed, highlighting the role of strong ligands, the control of deposition rates, the chiral induction, and the evidence for the active sites. (4) An active site with sparse ligands could also be exploited in etching, where the freshly exposed surface would promote further etching. The result is an unusual sharpening etching mode, in contrast to the conventional rounding mode for minimized surface energy. Colloidal nanosynthesis holds great promise for scalable on-demand synthesis, providing the crucial nanomaterials for future explorations. The strong ligands have delivered powerful synthetic controls, which could be further enhanced with in-depth studies on growth mechanisms and synthetic strat...

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Geometric Control and Optical Properties of Intrinsically Chiral Plasmonic Nanomaterials

Sun,

Tao,

Yang

et al. 2023

Advanced Materials

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Intrinsically chiral plasmonic nanomaterials exhibit intriguing geometry‐dependent chiroptical properties, which is due to the combination of plasmonic features with geometric chirality. Thus, chiral plasmonic nanomaterials have become promising candidates for applications in biosensing, asymmetric catalysis, biomedicine, photonics, etc. Recent advances in geometric control and optical tuning of intrinsically chiral plasmonic nanomaterials have further opened up a unique opportunity for their widespread applications in many emerging technological areas. Here, we review the recent developments in the geometric control of chiral plasmonic nanomaterials with special attention given to the quantitative understanding of the chiroptical structure‐property relationship. We also discuss several important optical spectroscopic tools for characterizing the optical chirality of plasmonic nanomaterials at both ensemble and single‐particle levels. We further highlight three emerging applications of chiral plasmonic nanomaterials including enantioselective sensing, enantioselective catalysis, and biomedicine. We envision that these advanced studies in chiral plasmonic nanomaterials will pave the way toward the rational design of chiral nanomaterials with desired optical properties for diverse emerging technological applications.This article is protected by copyright. All rights reserved

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From flat to deep concave: an unusual mode of facet control

Abstract: Au particles with rhombic dodecahedra outline and deep cavities are obtained by epitaxial growth from triangular nanoplate. An unusual “wrapping” growth that combines the ligand-promoted facet-selective growth and the site-specific...

Cited by 10 publications

References 29 publications

Understanding the evolution of tunable spiral threads in homochiral Au nano-screws

Understanding the evolution of tunable spiral threads in homochiral Au nano-screws

Strong Ligand Control for Noble Metal Nanostructures

Geometric Control and Optical Properties of Intrinsically Chiral Plasmonic Nanomaterials

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