Gold nanoparticle nanofibres as SERS substrate for detection of methylene blue and a chemical warfare simulant (methyl salicylate)

Hyperbolic metamaterials (HMMs), supporting surface plasmon polaritons (SPPs), and highly confined bulk plasmon polaritons (BPPs) possess promising potential for application as surface-enhanced Raman scattering (SERS) substrates. In the present study, a composite SERS substrate based on a multilayer HMM and gold-nanoparticle (Au-NP) layer was fabricated. A strong electromagnetic field was generated at the nanogaps of the Au NPs under the coupling between localized surface plasmon resonance (LSPR) and a BPP. Additionally, a simulation of the composite structure was assessed using COMSOL; the results complied with those achieved through experiments: the SERS performance was enhanced, while the enhancing rate was downregulated, with the extension of the HMM periods. Furthermore, this structure exhibited high detection performance. During the experiments, rhodamine 6G (R6G) and malachite green (MG) acted as the probe molecules, and the limits of detection of the SERS substrate reached 10−10 and 10−8 M for R6G and MG, respectively. Moreover, the composite structure demonstrated prominent reproducibility and stability. The mentioned promising results reveal that the composite structure could have extensive applications, such as in biosensors and food safety inspection.

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A New and Facile Route to Prepare Gold Nanoparticle Clusters on Anodic Aluminium Oxide as a SERS Substrate

Talanta ◽

10.1016/j.talanta.2021.122426 ◽

2021 ◽

pp. 122426

Author(s):

Tuğba Tezcan ◽

Ismail Hakki Boyaci

Keyword(s):

Gold Nanoparticle ◽

Aluminium Oxide ◽

Sers Substrate ◽

Anodic Aluminium Oxide ◽

Nanoparticle Clusters ◽

Facile Route

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Influence of gold nanoparticle modified electrode on the mediation reduction of ferricyanide by methylene blue

Journal of Electroanalytical Chemistry ◽

10.1016/j.jelechem.2006.11.029 ◽

2007 ◽

Vol 602 (1) ◽

pp. 55-60 ◽

Cited By ~ 19

Author(s):

Shufeng Liu ◽

Li Wang ◽

Feng Zhao

Keyword(s):

Methylene Blue ◽

Gold Nanoparticle ◽

Modified Electrode

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Influence of Ag Photodeposition Conditions over SERS Intensity of Ag/ZnO Microspheres for Nanomolar Detection of Methylene Blue

Nanomaterials ◽

10.3390/nano11123414 ◽

2021 ◽

Vol 11 (12) ◽

pp. 3414

Author(s):

Luis Zamora-Peredo ◽

Josué Ismael García-Ramirez ◽

Amado Carlos García-Velasco ◽

Julián Hernández-Torres ◽

Leandro García-González ◽

...

Keyword(s):

Methylene Blue ◽

Raman Spectroscopy ◽

Uv Irradiation ◽

Irradiation Time ◽

Molar Concentration ◽

Sers Substrate ◽

X Ray Diffraction ◽

X Ray ◽

Nanomolar Detection ◽

Ag Deposition

Surface enhanced Raman spectroscopy (SERS) is considered a versatile and multifunctional technique with the ability to detect molecules of different species at very low molar concentration. In this work, hierarchical ZnO microspheres (ZnO MSs) and Ag/ZnO MSs were fabricated and decorated by hydrothermal and photodeposition methods, respectively. For Ag deposition, precursor molar concentration (1.9 and 9.8 mM) and UV irradiation time (5, 15, and 30 min) were evaluated by SEM, TEM, X-ray diffraction and Raman spectroscopy. X-ray diffraction showed a peak at 37.9° corresponding to the (111) plane of Ag, whose intensity increases as precursor concentration and UV irradiation time increases. SEM images confirmed the formation of ZnO MSs (from 2.5 to 4.5 µm) building by radially aligned two-dimensional ZnO nanosheets with thicknesses below 30 nm. The Raman spectra of Ag/ZnO MSs exhibited a vibration mode at 486 cm−1 which can be directly associated to Ag deposition on ZnO MSs surface. The performance of SERS substrate was evaluated using rhodamine 6G. The SERS substrate grown at 9.8 mM during 30 min showed the best SERS activity and the ability to detect methylene blue at 10−9 M.

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