Tunable orientation of two-dimensional assembled Au octahedron superlattices in polymer films as flexible SERS substrates

Tian, Xiangdong; Zhang, Yun

doi:10.1039/d2nr07165g

Cited by 6 publications

(1 citation statement)

References 32 publications

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“…Moreover, the SERS substrate is usually designed with nanoscale metallic structures coated on polymer, [3][4][5][6][7] glass, anodic aluminum oxide (AAO), 8 or silicon 9,10 substrates. When excitation light is incident on the surface of the SERS substrate, surface plasmon resonance (SPR) occurs, and the photothermal effect causes the temperature to increase.…”

Section: Introductionmentioning

confidence: 99%

Low power density, high-efficiency reflective Raman system for polymer SERS substrates

Lin,

Chang,

Tsia

et al. 2024

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Low power density, high-efficiency reflective Raman system for polymer SERS substrates

Lin,

Chang,

Tsia

et al. 2024

RSC Adv.

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Ready‐to‐Use Free‐Standing Super‐Powder Made with Complex Nanoparticles for SERS

Haddadnezhad,

Jung,

et al. 2024

Advanced Materials

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This study presents a straightforward and efficient synthetic approach for producing high‐yield, ready‐to‐use, free‐standing super‐powder. The synthesis protocol demonstrates versatility, enabling the creation of assemblies from various nanoparticle morphologies and compositions without the need for specific substrates. Au nanorings are employed as building blocks for fabricating the super‐powder, which can be used in surface‐enhanced Raman spectroscopy (SERS). The distinctive aspect ratio of the ring nanoframes allows the formation of densely packed columnar assemblies on the substrate, aligning the exposed gaps perpendicular to the laser beam. This arrangement significantly enhances the charge separation among nanorings, leading to a highly focused near‐field that is applicable to SERS analysis. The SERS detection feasibility of this powder in both pre‐ and post‐contamination conditions is demonstrated. Using a wide range of building blocks, encompassing various shapes (for instance, rods, hexagons, cubes, cuboctahedrons, elongated dodecahedrons, triangular rings, double‐rings, elongated dodecahedra frames, cuboctahedra frames, and double‐walled frames), we substantiate the generalizability of the process for synthesizing super‐powders with diverse morphologies.This article is protected by copyright. All rights reserved

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Macroscopic Superlattice Membranes Self‐Assembled from Gold Nanobipyramids with Precisely Tunable Tip Arrangements for SERS

Ding,

Xia,

Song

et al. 2024

Angewandte Chemie

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A persistent challenge in utilizing Au nanocrystals for surface‐enhanced Raman spectroscopy (SERS) lies in achieving controllable superstructures that maximize SERS performance. Here, a novel strategy is proposed to enhance the SERS performance by precisely adjusting the tip arrangements of Au nanobipyramids (BPs) in two‐dimensional (2D) superlattices (SLs). This is achieved through ligand‐exchange of Au BPs, followed by liquid‐air interfacial assembly, resulting in large‐area, transferrable SL membranes. The key to controlling the arrangement of Au BPs in the SLs is the regulation of the amount of free ligands added during self‐assembly, which allows for the precise formation of various configurations such as tilted SLs, tip‐on‐tip SLs, and tip‐to‐tip SLs. Among these configurations, tip‐on‐tip SLs exhibit the highest enhancement factor for SERS, reaching an impressive value of 1.95 × 108, with uniform and consistent SERS signals across a large area. The experimental findings are further corroborated by simulations using the finite element method. This study establishes an efficient method for engineering the microstructure of 2D SLs composed of Au BPs, highlighting the importance of fine‐tuning the tip arrangements of Au BPs to regulate SERS performance.

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Tunable orientation of two-dimensional assembled Au octahedron superlattices in polymer films as flexible SERS substrates

Abstract: Anisotropic nanoparticles have been widely used as building blocks to prepare surface-enhanced Raman spectroscopy (SERS) substrates. However, how to tailor the SERS activity at the self-assembly level through the anisotropic...

Cited by 6 publications

References 32 publications

Low power density, high-efficiency reflective Raman system for polymer SERS substrates

Low power density, high-efficiency reflective Raman system for polymer SERS substrates

Ready‐to‐Use Free‐Standing Super‐Powder Made with Complex Nanoparticles for SERS

Macroscopic Superlattice Membranes Self‐Assembled from Gold Nanobipyramids with Precisely Tunable Tip Arrangements for SERS

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