Fabrication and simulation of V-shaped Ag nanorods as high-performance SERS substrates

Li, Jianghao; Fan, Yihang; Xue, Xiaotian; Ma, Li; Zou, Siyu; Zhu, Fangyuan; Xie, Zheng; Zhang, Zhengjun

doi:10.1039/c8cp05533e

Cited by 12 publications

(15 citation statements)

References 32 publications

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“…Typically, after the fabrication of the first arm followed by a short cooling, the substrates holder was azimuthally rotated a certain angle to start deposition of the next arm. The numerical simulation was employed to compare EFs of V-shape and straight AgNRs with the same length, and the result (Figure 2B) showed that V-shape AgNRs exhibited stronger EFs in almost 90% cases under a 785 nm laser (Li et al, 2018). SERS performance of AgNRs as a function of the arm number N ( N ≥ 3) was also investigated.…”

Section: Synthesis and Properties Of Agnrs-based Nanostructuresmentioning

confidence: 99%

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Ag Nanorods-Based Surface-Enhanced Raman Scattering: Synthesis, Quantitative Analysis Strategies, and Applications

Zou

et al. 2019

Front. Chem.

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Surface-Enhanced Raman Scattering (SERS) is a powerful technology that provides abundant chemical fingerprint information with advantages of high sensitivity and time-saving. Advancements in SERS substrates fabrication allow Ag nanorods (AgNRs) possess superior sensitivity, high uniformity, and excellent reproducibility. To further promote AgNRs as a promising SERS substrate candidate to a broader application scope, oxides are integrated with AgNRs by virtue of their unique properties which endow the AgNRs-oxide hybrid with high stability and recyclability. Aside from SERS substrates fabrication, significant developments in quantitative analysis strategies offer enormous approaches to minimize influences resulted from variations of measuring conditions and to provide the reasonable data analysis. In this review, we discuss various fabrication approaches for AgNRs and AgNRs-oxide hybrids to achieve efficient SERS platforms. Then, we introduce three types of strategies which are commonly employed in chemical quantitative analysis to reach a reliable result. Further, we highlight SERS applications including food safety, environment safety, biosensing, and vapor sensing, demonstrating the potential of SERS as a powerful and promising technique. Finally, we conclude with the current challenges and future prospects toward efficient SERS manipulations for broader real-world applications.

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Section: Synthesis and Properties Of Agnrs-based Nanostructuresmentioning

confidence: 99%

“…(B) Numerical simulations of Raman EFs for the V-shaped AgNR and the straight AgNR as a function of AgNRs total length under a 785 nm laser. Reproduced with permission from Li et al (2018). Copyright (2018) RSC publications.…”

Section: Synthesis and Properties Of Agnrs-based Nanostructuresmentioning

confidence: 99%

Ag Nanorods-Based Surface-Enhanced Raman Scattering: Synthesis, Quantitative Analysis Strategies, and Applications

Zou

et al. 2019

Front. Chem.

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“…Surface-enhanced Raman scattering (SERS) has been emerging as a powerful spectroscopic technique due to its extremely high sensitivity, fingerprint character and rapid nondestructive detection of molecules at an ultralow concentration [1][2][3][4][5]. In general, local surface plasmon resonance preferentially occurs in the nanoscale gaps between metal nanostructures [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Dendritic Au–Ag Substrate for On-Site SERS Detection of Trace Molecules in Liquid Phase

Shao

Niu

et al. 2022

Nanomaterials

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The development of a facile surface-enhanced Raman scattering (SERS) sensor for the on-site detection of trace molecules in liquid phase is a compelling need. In this paper, a three-dimensional (3D) dendritic Au–Ag nanostructure was constructed by a two-step electro displacement reaction in a capillary tube for the on-site liquid phase detection of trace molecules. The multiplasmon resonance mechanism of the dendritic Au–Ag structure was simulated using the finite-difference time domain (FDTD) method. It was confirmed that the highly branched 3D structure promoted the formation of high-density “hot spots” and interacted with the gold nanoparticles at the dendrite tip, gap, and surface to maximize the spatial electric field, which allowed for high signal intensification to be observed. More importantly, the unique structure of the capillary made it possible to achieve the on-site detection of trace molecules in liquids. Using Rhodamine 6G (R6G) solution as a model molecule, the 3D dendritic Au–Ag substrate exhibited a high detection sensitivity (10−13 mol/L). Furthermore, the developed sensor was applied to the detection of antibacterial agents, ciprofloxacin (CIP), with clear Raman characteristic peaks observed even at concentrations as low as 10−9 mol/L. The results demonstrated that the 3D dendritic Au–Ag sensor could successfully realize the rapid on-site SERS detection of trace molecules in liquids, providing a promising platform for ultrasensitive and on-site liquid sample analysis.

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“…Our previous work revealed that V-shaped Ag NR arrays possess much better SERS sensitivity than straight Ag NRs by building implanted hot spots within individual nanorods. 14 Normally, the hot spots could be observed at the junctions of nanodimers or on the tips of nanostructures. In this work, we successfully fabricated a series of armrest Ag NRs@Al 2 O 3 with well-controlled morphology as well as enhanced hot spots quantity by taking advantage of the AAO template and oblique angle deposition.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, localized surface plasmon resonance (LSPR) and the related physical phenomenon have received tremendous research attention due to the extensive optical manipulation and utilization of sensor applications in surface science. − With the successful establishment of a nanostructure where local electric field intensity enhanced significantly (10 4 –10 9 enlarged magnitudes), LSPR enhancement is considered to be effective in near-field manipulation upon illumination and induces remarkable surface-enhanced Raman scattering (SERS). − As has been widely demonstrated, the excitation and modulation of LSPR are not only related to the dielectric constant of the selected materials or the surrounding environment but also greatly dependent on the morphology, structure, and interparticle coupling of the nanostructures. − To effectively enlarge the LSPR enhancement degree, and thus gain outstanding SERS performance, researchers have put great efforts in designing nanostructures with enhanced intensified electromagnetic fields, that is, the “hot spots”. − Generally, the more the hot spots in the micronanostructure, the stronger the SERS signal generated from the substrate. In addition, the reduction of spacing between the adjacent structures and the ratio of the interparticle gap to the diameter could significantly enhance the local hot spots intensity of the SERS-active substrate, endowing further enhanced performance of the nanostructure with given hot spots quantity.…”

Section: Introductionmentioning

confidence: 99%

Design of Armrest Ag Nanorod Arrays with High SERS Performance for Sensitive Biomolecule Detection

et al. 2020

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To enlarge the surface-enhanced Raman scattering (SERS) enhancement of Ag nanopillar arrays, a well-controlled armrest Ag NRs@Al2O3 structure was designed, aiming at triggering efficient resonance between the nanopillar and the Ag NRs. A series of armrest Ag NRs@Al2O3 with well-designed morphology as well as enhanced “hot spots” quantity by taking advantage of AAO template and oblique angle deposition were successfully fabricated. Both experimental results and numerical simulations revealed localized surface plasmon resonance (LSPR) tunability by simply optimizing the arm length. An optimal substrate with outstanding SERS performance for dyes and biomolecular was realized by enhancing the hot spots area while tuning the resonance peak close to the 785 nm excitation. The as-fabricated 14-Ag NRs@Al2O3 without any surface modification presented a glucose detection limit of 1 × 10–4 mM, endowing our SERS platform for sensitive label-free biodetection.

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Fabrication and simulation of V-shaped Ag nanorods as high-performance SERS substrates

Abstract: V-shaped AgNRs have a higher SERS sensitivity than straight AgNRs and their resonance wavelengths can be tuned linearly.

Cited by 12 publications

References 32 publications

Ag Nanorods-Based Surface-Enhanced Raman Scattering: Synthesis, Quantitative Analysis Strategies, and Applications

Ag Nanorods-Based Surface-Enhanced Raman Scattering: Synthesis, Quantitative Analysis Strategies, and Applications

Three-Dimensional Dendritic Au–Ag Substrate for On-Site SERS Detection of Trace Molecules in Liquid Phase

Design of Armrest Ag Nanorod Arrays with High SERS Performance for Sensitive Biomolecule Detection

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