Recent progress of gold nanostructures and their applications

Dahan, Khadiga Ali; Li, Ying; Xu, Juan; Kan, Caixia

doi:10.1039/d3cp01549a

Cited by 24 publications

(10 citation statements)

References 181 publications

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“…The aligned Ag NR array has an average diameter of approximately 80 nm at the tips, an average rod length of 1000 nm, and a broad absorption peak in the NIR region . All of these three SERS-based substrate geometries provide similar electric field enhancement factors (EFs), essential for enhanced SERS sensitivity. ,,,− …”

Section: Resultsmentioning

confidence: 99%

Identifying Surface-Enhanced Raman Spectra with a Raman Library Using Machine Learning

Ju,

Neumann,

Bajomo

et al. 2023

ACS Nano

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Since its discovery, surface-enhanced Raman spectroscopy (SERS) has shown outstanding promise of identifying trace amounts of unknown molecules in rapid, portable formats. However, the many different types of nanoparticles or nanostructured metallic SERS substrates created over the past few decades show substantial variability in the SERS spectra they provide. These inconsistencies have even raised speculation that substrate-specific SERS spectral libraries must be compiled for practical use of this type of spectroscopy. Here, we report a machine learning (ML) algorithm that can identify chemicals by matching their SERS spectra to those of a standard Raman spectral library. We use an approach analogous to facial recognition that utilizes feature extraction in the presence of multiple nuisance variables for spectral recognition. The key element is a metric we call "Characteristic Peak Similarity" (CaPSim) that focuses on the characteristic peaks in the SERS spectra. It has the flexibility to accommodate substrate-specific variability when quantifying the degree of similarity to a Raman spectrum. Analysis shows that CaPSim substantially outperforms existing spectral matching algorithms in terms of accuracy. This ML-based approach could greatly facilitate the spectroscopic identification of molecules in fieldable SERS applications.

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Section: Resultsmentioning

confidence: 99%

Identifying Surface-Enhanced Raman Spectra with a Raman Library Using Machine Learning

Ju,

Neumann,

Bajomo

et al. 2023

ACS Nano

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“…Firstly, it can alter the defect concentration or energy levels within the oxide material, leading to changes in the luminescent properties [55]. Secondly, Ag nanoparticles can act as surface plasmon resonators, enhancing the electromagnetic field around them and thereby influencing the luminescence of nearby species [56]. Regarding the laser treatment, it can introduce additional defects or modify existing defects in the oxides [57,58].…”

Section: Photoluminescence (Pl) Analysismentioning

confidence: 99%

Effect of Nd:YAG pulsed laser on the antibacterial activity and physical properties of newly synthesized composites, CdO/Co₃O₄ and Ag/CdO/Co₃O₄

El Agammy,

Hasaneen,

Essawy

et al. 2023

Phys. Scr.

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Two compounds were prepared: cadmium oxide/cobalt oxide (referred to as oxide A) and silver decorated cadmium oxide/cobalt oxide (referred to as oxide B). Yttrium aluminium garnet (Nd:YAG) lasers, doped with neodymium, were used to irradiate the samples at 532 nm and 1064 nm. The effect of the Nd:YAG laser on the morphological, optical, structural, and antibacterial properties was investigated. The XRD data shows that both oxides are polycrystalline, and the laser irradiation increases the crystal size. Additionally, scanning electron microscopy results (SEM) show that particle size increases with laser irradiation and laser wavelength. While both oxides expand under the influence of a laser, oxide A has a larger optical band gap than oxide B. The intensity of PL increases with the pulsed laser effect and the addition of Ag. The antibacterial test shows that silver is quite effective in eliminating germs and other harmful microbes for human health. Moreover, the results show that, after adjusting the other laser parameters, the wavelength of 1064 nm performed better compared to the wavelength of 532 nm in pure water.

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“…[10][11][12][13] Consequently, these plasmonic nanostructures can be tailored to interact with nearly the entire solar spectrum, especially in the visible range, making them highly effective for light absorption. [14] In the plasmonic-assisted photoelectrocatalysis, the mechanism of charge carrier photoexcitation differs from that in the traditional photoelectrocatalysis. The latter harnesses solar light to produce photoexcited electron-hole pairs, which then drive electrochemical reactions at a semiconductor photoelectrode, either biased or unbiased.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic‐assisted Electrocatalysis for CO₂ Reduction Reaction

Wang,

Mao,

Wang

2024

ChemElectroChem

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Integrating plasmonic features as an emerging strategy for enhancing electrocatalysis for the carbon dioxide reduction reaction (CO2RR). The key parameters responsible for the enhanced electrocatalysis performance are the local heating, the hot carriers, and near‐field enhancement induced by localized surface plasmon resonance (LSPR, that is, plasmonic) excitation. This review provides a concise overview of the fundamental mechanism of CO2RR, detailing the generation and decay of plasmonic and the energy transfer dynamics between plasmonic nanostructures and adsorbates. It further involves recent progress in plasmonic‐assisted electrocatalysis for CO2RR, including experimental and theoretical research to decipher plasmonic mechanisms. Finally, it ends with an insightful discussion of the existing challenges and potential future directions in this field.

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Recent progress of gold nanostructures and their applications

Abstract: For noble metals, such as gold (Au) and silver (Ag), it is well-known that surface plasmons of their nanocrystals have significant spatial confinement and propagation loss due to the strong...

Cited by 24 publications

References 181 publications

Identifying Surface-Enhanced Raman Spectra with a Raman Library Using Machine Learning

Identifying Surface-Enhanced Raman Spectra with a Raman Library Using Machine Learning

Effect of Nd:YAG pulsed laser on the antibacterial activity and physical properties of newly synthesized composites, CdO/Co₃O₄ and Ag/CdO/Co₃O₄

Plasmonic‐assisted Electrocatalysis for CO₂ Reduction Reaction

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Recent progress of gold nanostructures and their applications

Abstract: For noble metals, such as gold (Au) and silver (Ag), it is well-known that surface plasmons of their nanocrystals have significant spatial confinement and propagation loss due to the strong...

Cited by 24 publications

References 181 publications

Identifying Surface-Enhanced Raman Spectra with a Raman Library Using Machine Learning

Identifying Surface-Enhanced Raman Spectra with a Raman Library Using Machine Learning

Effect of Nd:YAG pulsed laser on the antibacterial activity and physical properties of newly synthesized composites, CdO/Co3O4 and Ag/CdO/Co3O4

Plasmonic‐assisted Electrocatalysis for CO2 Reduction Reaction

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Product

Resources

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Effect of Nd:YAG pulsed laser on the antibacterial activity and physical properties of newly synthesized composites, CdO/Co₃O₄ and Ag/CdO/Co₃O₄

Plasmonic‐assisted Electrocatalysis for CO₂ Reduction Reaction