A Facile and Rational Method to Tailor the Symmetry of Au@Ag Nanoparticles

Advanced Materials, Journal Year: 2023, Volume and Issue: unknown, P. 2209810 - 2209810

Published: Jan. 19, 2023

Precisely controlling the morphologies of plasmonic metal nanoparticles (NPs) is great importance for many applications. Here, a facile seed-mediated growth method demonstrated that tailors Au@Ag NPs from cubes/cuboids to chiral truncated cuboids/octahedra, well-defined octahedra, and tetrahedra, via simply increasing concentrations AgNO3 cysteine in halide surfactant systems. Accordingly, particle symmetries are also tuned. The quite robust where seeds with distinct shapes including irregular ones can all lead uniform NPs. evolution these be illustrated by recently proposed symmetry-based kinematic theory (SBKT). Furthermore, SBKT shows strategy optimize preparation chiral/dissymmetric NPs, experimental results confirm such dissymmetric synthesis strategy. Cuboids octahedra corners differently identified as two different forms. chirality additionally probed electrochemistry, show enantioselectivity oxidation d- l-glucose. Altogether, gain fundamental insights into tailoring NP morphologies, suggest strategies obtain

Language: Английский

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Chiral Active Surface Growth via Glutathione Control

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 11(18)

Published: April 23, 2023

Abstract It is shown that the chiral ligand glutathione can induce active surface growth in deposition of Au on nanoplates, forming nano‐badges with complex patterns. The special feature mode materials are diverted to a few sites, causing deep valleys and high standing walls. circular dichroism signal depends tilting degree walls, which likely arises from different packing ligands two pro‐chiral slopes. As characteristic sign Active Surface Growth mode, low seed concentration used promote rate deposition, expands ridge–valley competition favoring at sites. understanding rational control ridges will advance synthetic for nanostructures.

Language: Английский

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Chiral Plasmonic Hybrid Nanostructures: A Gateway to Advanced Chiroptical Materials

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(3)

Published: Nov. 9, 2023

Abstract Chirality introduces a new dimension of functionality to materials, unlocking possibilities across various fields. When integrated with plasmonic hybrid nanostructures, this attribute synergizes and other functionalities, resulting in unprecedented chiroptical materials that push the boundaries system's capabilities. Recent advancements have illuminated remarkable chiral light–matter interactions within nanomaterials, allowing for harnessing their tunable optical activity components. These led applications areas such as sensing, catalysis, spin optics. Despite these promising developments, there remains need comprehensive synthesis current state‐of‐the‐art knowledge, well thorough understanding construction techniques practical field. This review begins an exploration origins chirality overview latest nanostructures. Furthermore, representative emerging categories nanomaterials are classified summarized, elucidating versatile applications. Finally, engages fundamental challenges associated nanostructures offer insights into future prospects advanced

Language: Английский

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Synthesis and Plasmonic Chiroptical Properties of Double‐Helical Gold Nanorod Enantiomers

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 11(18)

Published: March 14, 2023

Abstract Chiroplasmonic nanostructures have drawn increasing attention in the applications of photonics, biosensing, and asymmetric catalysis owing to their intense chiroptical activities. However, types plasmonic nanoparticles with intrinsic chiral shapes are still rare now. Herein, authors report a seed‐mediated strategy for synthesis chiral‐morphology gold nanorods (GNRs) novel 222 symmetry as same that DNA double helixes. The GNRs sides twisted into double‐helical‐strip shape synthesized by formation high‐Miller‐index side surfaces through regrowth GNRs. exhibit an excellent circular dichroism response visible near‐infrared regions, which is consistent finite‐difference time‐domain simulations. Moreover, adjusting synthetic parameters, 222‐symmetry can be tuned. This work holds promise fabrication chiroplasmonic tailored toward applications.

Language: Английский

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Geometric Control and Optical Properties of Intrinsically Chiral Plasmonic Nanomaterials

Advanced Materials, Journal Year: 2023, Volume and Issue: unknown

Published: Aug. 12, 2023

Abstract Intrinsically chiral plasmonic nanomaterials exhibit intriguing geometry‐dependent chiroptical properties, which is due to the combination of features with geometric chirality. Thus, have become promising candidates for applications in biosensing, asymmetric catalysis, biomedicine, photonics, etc. Recent advances control and optical tuning intrinsically further opened up a unique opportunity their widespread many emerging technological areas. Here, recent developments are reviewed special attention given quantitative understanding structure‐property relationship. Several important spectroscopic tools characterizing chirality at both ensemble single‐particle levels also discussed. Three nanomaterials, including enantioselective sensing, highlighted. It envisioned that these advanced studies will pave way toward rational design desired properties diverse applications.

Language: Английский

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Chiral nanomaterials in tissue engineering

Nanoscale, Journal Year: 2024, Volume and Issue: 16(10), P. 5014 - 5041

Published: Jan. 1, 2024

A timely review on chiral nanomaterials in tissue engineering, with a discussion their evaluation prior to clinical applications.

Language: Английский

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Selective Flocculation and H₂O₂-Free Oxidative Etching-Based Synthesis of Highly Monodisperse Ag Nanospheres for Uniform Quantum Dot Photoluminescence-Enhancing Plasmonic Cavity Applications

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(15), P. 10591 - 10598

Published: April 4, 2024

Ag nanoparticles have garnered significant attention for their excellent plasmonic properties and potential use as cavities, primarily because of intrinsically low ohmic losses optical in the visible range. These are particularly crucial systems involving quantum dots that absorb light at wavelengths, where need a high threshold energy interband transitions necessitates incorporation nanostructures. However, synthesis still encounters challenges achieving structural uniformity monodispersity, along with chemical stability, consequentially inducing inconsistent poorly reliable responses. Here, we present two-step approach synthesizing highly uniform spherical depletion-induced flocculation Cu(II)-mediated oxidative etching. We found selective multitwinned nanocrystals significantly enhances resulting nanostructures, leaving behind only single-crystalline single-twinned Subsequent etching, which cupric ions directly involved reaction, was designed based on Pourbaix diagrams to proceed following thermodynamically favorable states circumvent generation reactive species such H

Language: Английский

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The structure and plasmonic properties regulation of Au@Ag core-shell nanostructures with Au triangular nanoprisms as the core mediated by halide

Journal of Alloys and Compounds, Journal Year: 2023, Volume and Issue: 944, P. 169245 - 169245

Published: Feb. 10, 2023

Language: Английский

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Coated Chiral Plasmonic Nanorods with Enhanced Structural Stability

Chemistry of Materials, Journal Year: 2023, Volume and Issue: 35(14), P. 5689 - 5698

Published: July 1, 2023

Several synthesis techniques have emerged for the preparation of chiral metal nanoparticles (NPs) with intrinsic geometrical structures and high optical activity. Chiral plasmonic NPs typically display intricate morphologies terminated by high-energy facets, resulting in limited long-term thermal stability, which is critical development their applications, e.g., biomedical field. gold nanorods (Au NRs) suffer from loss structural stability (reshaping), turn results We carried out a systematic analysis Au NRs covered different protecting shells, against corrosive ions reshaping. Our findings can be readily extended to other fine details alleviate concerns instability various applications under heating complex environments.

Language: Английский

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Silver Nanowires‐Based Flexible Gold Electrode Overcoming Interior Impedance of Nanomaterial Electrodes

Small, Journal Year: 2024, Volume and Issue: 20(25)

Published: Jan. 9, 2024

Abstract In the development of nanomaterial electrodes for improved electrocatalytic activity, much attention is paid to compositions, lattice, and surface morphologies. this study, a new concept enhance activity proposed by reducing impedance inside electrodes. Gold nanodendrites (AuNDs) are grown along silver nanowires (AgNWs) on flexible polydimethylsiloxane (PDMS) support. The AuNDs/AgNWs/PDMS electrode affords an oxidative peak current density 50 mA cm −2 ethanol electrooxidation, value ≈20 times higher than those in literature do. Electrochemical spectroscopy (EIS) demonstrates significant contribution AgNWs reduce impedance. densities electrooxidation decreased 7.5‐fold when electrolytically corroded. By situ surface‐enhanced Raman (SERS) functional theory (DFT) simulation, it validated that favors production acetic acid with undetectable CO, resulting more complete oxidation long‐term stability, while corrosion greatly decreases production. This novel strategy fabricating using as charge transfer conduit may stimulate insights into design

Language: Английский

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