Engineering the inter-island plasmonic coupling in homometallic Au-Aun core–satellite structures

Wu, Xiaoying; Tian, Xiaoli; Jiang, Zihe; Wang, Yun; Jiang, Tingting; Feng, Yuhua; Zhang, Zhenglong; Chen, Hongyu

doi:10.1007/s12274-023-5732-9

Cited by 5 publications

(7 citation statements)

References 35 publications

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“…For Au nanorods modified with 4-mercaptophenol, Au deposition gave a single Au island on each Au nanorod, leading to intense extinction across a broad spectral range (blackbody absorption) . For the Au nanorods modified with 5-amino-2-mercaptobenzimidazole (AMBI), Au islands or branches were obtained, where the strong ligand is responsible for the island growth mode, ,, the number of satellite islands per seed, and the active surface growth (section ). The strong extinction in the NIR-II spectral window was exploited for photothermal therapy and photoacoustic imaging (Figure c) .…”

Section: Embedding Of Ligandsmentioning

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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Section: Embedding Of Ligandsmentioning

confidence: 99%

Strong Ligand Control for Noble Metal Nanostructures

et al. 2023

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“…Hybrid nanostructures of noble metals are highly desirable for their stability as well as electronic and plasmonic properties. 1–6 They have been extensively used in catalysis, 7–9 sensing, and biomedical applications. 10–12…”

Section: Introductionmentioning

confidence: 99%

“…The free electrons in metal nanoparticles could respond to the electromagnetic fields of light, giving rise to localized surface plasmon resonance (LSPR) which is critically dependent on the nanostructures. 5,13,14 Hence, great efforts have been devoted to the synthetic development to explore and improve properties such as plasmonic absorption, energy transport, enhanced fluorescence, surface-enhanced Raman scattering (SERS), and non-linear optical properties. 15–18…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional active surface growth of Ag nanoplates

Ji,

Chen,

Jiang

et al. 2024

Inorg. Chem. Front.

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“…16,17 In addition, wide spectral absorption was also achieved in the isotropic AuNPs with single or multilayered Au nanoshell, 28−31 Au nanomatryoshkas, 32 hyperbranched AuNPs, 17 and core−satellite (CS) structures. Interestingly, the unusual charge transfer plasmon (CTP) was recently observed in the CS structures, 33 and the finetuning of the CTP was achieved through precise structural adjustment. 34,35 Though impressive progress has been achieved for the intraparticle coupling, their applications in the synthesis of the Au-based blackbody nanostructure is still a challenging task due to the high requisitions in comprehensive fine-tuning of the structural parameters at the few-nanometer scale.…”

Section: Introductionmentioning

confidence: 99%

Engineering the Blackbody Absorption of the Au-Branch-on-Au-Plate Heterostructures

Ji,

Wang,

Jiang

et al. 2024

Inorg. Chem.

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Utilizing the strong ligand control effects of L-cysteine (L-Cys), the growth of Au on Au triangular nanoplate (AuTN) seeds was continuously tuned from layer-by-layer (the Frank−van der Merwe) to layer-plus-island (the Stranski−Krastanov), and island (the Volmer−Weber) growth modes, leading to the formation of a series of Au-on-AuTN heterostructures. Within the window of VW growth mode (featured by the growth of Au spikes and branches on AuTNs), the effective localized surface plasmon resonance (LSPR) coupling led to the selective strengthening of the "valley" absorptions, leading to smooth and flat absorption curves. Interestingly, through engineering the number/density, size, and branching degree of the Au branches, except for the black color, full spectrum absorption within 400−1300 nm wavelength was achieved on Au-branch-on-AuTN structures. Mechanistic studies revealed that the blackbody absorption property of the Au-branch-on-AuTN originates from the well-balanced intraparticle LSPR couplings among the neighboring Au branches. The tunable blackness and the full spectrum absorption property made the Aubranch-on-AuTN heterostructure a suitable candidate for various plasmonic-related applications, such as a wide spectrum light absorber, photoacoustic imaging contrast agent, and photothermal therapy medium. In addition, our strong ligand control in Aubranch-on-AuTN heterostructures could be extended to other hybrid systems with diverse material combinations, so long as to find the proper strong ligand.

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Engineering the inter-island plasmonic coupling in homometallic Au-Aun core–satellite structures

Cited by 5 publications

References 35 publications

Strong Ligand Control for Noble Metal Nanostructures

Strong Ligand Control for Noble Metal Nanostructures

Two-dimensional active surface growth of Ag nanoplates

Engineering the Blackbody Absorption of the Au-Branch-on-Au-Plate Heterostructures

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