Engineering the Spatial Arrangement of Au–C<sub>60</sub> Heterostructures

Xu, Wu; Chen, Shuaipeng; Xiao, Ruixue; Zong, Jianpeng; Feng, Yuhua; Chen, Hongyu

doi:10.1021/acs.chemmater.1c01360

Cited by 7 publications

(7 citation statements)

References 52 publications

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“…The absorption peaks of the Au cores in Au@Rh(OH) 3 were continuously redshifted from 540 nm (Au seeds) to 544, 547, 553, 563, and 579 nm ( Figure 1G ). This can be attributed to the increase in the refractive index owing to the increase in the Rh(OH) 3 shell thickness ( Yue et al, 2016 ; Xu et al, 2021 ).…”

Section: Resultsmentioning

confidence: 99%

Diffusion-controlled bridging of the Au Island and Au core in Au@Rh(OH)3 core-shell structure

et al. 2023

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Hybrid nanostructures have garnered considerable interest because of their fascinating properties owing to the hybridization of materials and their structural varieties. In this study, we report the synthesis of [Au@Rh(OH)3]-Au island heterostructures using a seed-mediated sequential growth method. Through the thiol ligand-mediated interfacial energy, Au@Rh(OH)3 core-shell structures with varying shell thicknesses were successfully obtained. On these Au@Rh(OH)3 core-shell seeds, by modulating the diffusion of HAuCl4 in the porous Rh(OH)3 shell, site-specific growth of Au islands on the inner Au core or on the surface of the outer Rh(OH)3 shell was successfully achieved. Consequently, two types of distinct structures, the Au island-on-[Au@Rh(OH)3] dimer and Au island-Au bridge-[Au@Rh(OH)3] dumbbell structures with thin necks were obtained. Further modulations of the growth kinetics led to the formation of Au plate-Au bridge-[Au@Rh(OH)3] heterostructures with larger structural anisotropy. The flexible structural variations were demonstrated to be an effective means of modulating the plasmonic properties; the Au–Au heterostructures exhibited tunable localized surface plasmon resonance in the visible-near-infrared spectral region and can be used as surface-enhanced Raman scattering (SERS) substrates capable of emitting strong SERS signals. This diffusion-controlled growth of Au bridges in the Rh(OH)3 shells (penetrating growth) is an interesting new approach for structural control, which enriches the tool box for colloidal nanosynthesis. This advancement in structural control is expected to create new approaches for colloidal synthesis of sophisticated nanomaterials, and eventually enable their extensive applications in various fields.

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Section: Resultsmentioning

confidence: 99%

Diffusion-controlled bridging of the Au Island and Au core in Au@Rh(OH)3 core-shell structure

et al. 2023

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“…The Au@C 60 core–shell NPs are formed via a heterogeneous nucleation and growth mechanism . C 60 dissolved in toluene shows a broad extinction peak across the visible (brown line in Figure B).…”

Section: Resultsmentioning

confidence: 99%

“…The Au@C 60 core−shell NPs are formed via a heterogeneous nucleation and growth mechanism. 31 C 60 dissolved in toluene shows a broad extinction peak across the visible (brown line in Figure 1B). It can be mixed with Au NPs dispersed in dimethylformamide (DMF), which shows plasmon absorbance at 556 nm (redline in Figure 1B).…”

Section: Resultsmentioning

confidence: 99%

Optically Triggered Nanoscale Plasmonic Dynamite

et al. 2022

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Photons as energy carriers are clean and abundant, which can be conveniently applied for nanoactuation but the response is usually slow with very low energy efficiency/density. Here, we underpin the concept of robust nanoscale plasmonic dynamite by incorporating fullerene (C60). The Au@C60 core–shell nanoparticles can be triggered to explode in nanoscale with synergy of plasmon-enhanced photochemical and photothermal effects. It is suggested that a sensible amount of CO2 was generated and pressurized in nanometric volume in an extremely short time scale (∼ns), which triggers the nanoexplosion, rendering the ejection of Au NPs at the speed over 300 m/s. The ejection generates extremely large local forces (∼1 μN) with thermomechanical energy efficiency up to ∼30%, which is demonstrated as a powerful nanoengine for controlled mobilization of micro-objects on solid surfaces. Such nanoscale plasmonic dynamite is highly exploitable for different types of nanomachines, which provides a powerful energy source for nanoactuation and nanomigration.

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“…The noble metal NPs with sophisticated structures have great potential in many applications. Briefly, the embedding of ligands gives rise to strong SERS signals for sensing and monitoring (Figure a). ,, The appendant islands, branches, and complex hat morphologies on AuNPs lead to strong NIR absorption for photothermal therapy and photoacoustic imaging (Figure b). , The spatially isolated domains of Au–Cu 2 O and Au–C 60 Janus NPs promote charge separation and prevent charge recombination (Figure c). ,, The forest of ultrathin NWs provide large surface area, open diffusion channels, and interconnected circuits, promoting efficiency in catalysis and flexible electronics (Figure d). ,− The chiral nanostructures via active surface growth give strong chiral-optical responses. , And the nano-saw-teeth (Figure ) could be potentially used for building nanoscale cutting tools . It should be noted that the adsorption of strong ligands on metal surfaces can have various other effects, − in addition to the control of morphological features.…”

Section: Discussionmentioning

confidence: 99%

“…2 Similarly, tuning of the Au− C 60 interface was achieved via strong ligands, leading to Au− C 60 Janus nanostructures. 52 Both the Au−Cu 2 O and Au−C 60 hybrids were found to have enhanced charge separation efficiency, given the spatial separation of the metal−semiconductor domains.…”

Section: Tuning Core−shell or Core−island Interfacesmentioning

confidence: 99%

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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Engineering the Spatial Arrangement of Au–C₆₀ Heterostructures

Cited by 7 publications

References 52 publications

Diffusion-controlled bridging of the Au Island and Au core in Au@Rh(OH)3 core-shell structure

Diffusion-controlled bridging of the Au Island and Au core in Au@Rh(OH)3 core-shell structure

Optically Triggered Nanoscale Plasmonic Dynamite

Strong Ligand Control for Noble Metal Nanostructures

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Engineering the Spatial Arrangement of Au–C60 Heterostructures

Cited by 7 publications

References 52 publications

Diffusion-controlled bridging of the Au Island and Au core in Au@Rh(OH)3 core-shell structure

Diffusion-controlled bridging of the Au Island and Au core in Au@Rh(OH)3 core-shell structure

Optically Triggered Nanoscale Plasmonic Dynamite

Strong Ligand Control for Noble Metal Nanostructures

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Engineering the Spatial Arrangement of Au–C₆₀ Heterostructures