Hybrid nanostructures for SERS: materials development and chemical detection

Fateixa, Sara; Nogueira, Helena I. S.; Trindade, Tito

doi:10.1039/c5cp01032b

Cited by 168 publications

(123 citation statements)

References 511 publications

(785 reference statements)

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“…Such morphology arises from coupling between the electron clouds on NPs surface under the incident electromagnetic radiation. 44 Similarly lemon and apple peel extracts lead to almost circular SPIONs even after 30 seconds MW heating. However, orange peels extract lead to slightly elongated SPIONs ( Figure S1C) in a high yield after 120 seconds of MW heating.…”

Section: Uv-vis Spectroscopymentioning

confidence: 99%

“…29 Similarly, common phytochemical constituents in pomegranate peel extracts are glycerin, hydroxymethylfurfurole, guanosine and pyrogallol. [42][43][44][45] This higher abundances of multifunctional compounds in these peel extracts may be responsible for the synthesis of NPs.…”

Section: Uv-vis Spectroscopymentioning

confidence: 99%

“…Phytochemicals bound to the surface of bio-SPIONs are rich in hydrophilic hydroxyl groups that allowed the NPs to disperse and distribute homogenously in aqueous media (Table S1). [27][28][29][42][43][44][45] The major compounds found in apple peel extract are highly branched alcohols and aldehydes. 27 Several aldehydes and alcohols are also present in lemon and orange peel extracts.…”

Section: Uv-vis Spectroscopymentioning

confidence: 99%

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Microwave-assisted green synthesis of superparamagnetic nanoparticles using fruit peel extracts: surface engineering, T2 relaxometry, and photodynamic treatment potential

Bano¹,

Nazir²,

Nazir³

et al. 2016

IJN

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Superparamagnetic iron oxide nanoparticles (SPIONs) have the potential to be used as multimodal imaging and cancer therapy agents due to their excellent magnetism and ability to generate reactive oxygen species when exposed to light. We report the synthesis of highly biocompatible SPIONs through a facile green approach using fruit peel extracts as the biogenic reductant. This green synthesis protocol involves the stabilization of SPIONs through coordination of different phytochemicals. The SPIONs were functionalized with polyethylene glycol (PEG)-6000 and succinic acid and were extensively characterized by X-ray diffraction analysis, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, atomic force microscopy, Rutherford backscattering spectrometry, diffused reflectance spectroscopy, fluorescence emission, Fourier-transform infrared spectroscopy, ultraviolet-visible spectroscopy, and magnetization analysis. The developed SPIONs were found to be stable, almost spherical with a size range of 17–25 nm. They exhibited excellent water dispersibility, colloidal stability, and relatively high R 2 relaxivity (225 mM −1 s −1 ). Cell viability assay data revealed that PEGylation or carboxylation appears to significantly shield the surface of the particles but does not lead to improved cytocompatibility. A highly significant increase of reactive oxygen species in light-exposed samples was found to play an important role in the photokilling of human cervical epithelial malignant carcinoma (HeLa) cells. The bio-SPIONs developed are highly favorable for various biomedical applications without risking interference from potentially toxic reagents.

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Section: Uv-vis Spectroscopymentioning

confidence: 99%

Section: Uv-vis Spectroscopymentioning

confidence: 99%

Section: Uv-vis Spectroscopymentioning

confidence: 99%

See 1 more Smart Citation

Microwave-assisted green synthesis of superparamagnetic nanoparticles using fruit peel extracts: surface engineering, T2 relaxometry, and photodynamic treatment potential

Bano¹,

Nazir²,

Nazir³

et al. 2016

IJN

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“…Surface-enhanced Raman spectroscopy (SERS) allows the detection of several analytes and provides enhanced Raman signals of adsorbed molecules onto certain metal surfaces [3,4]. SERS enhancement occurs due to the interaction of an incident electromagnetic field with localized surface plasmon resonance (LSPR) observed on certain metals, such as colloidal silver and gold.…”

Section: Introductionmentioning

confidence: 99%

SERS Detection of Penicillin G Using Magnetite Decorated with Gold Nanoparticles

2017

Self Cite

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Sensitive and reliable procedures for detecting vestigial antibiotics are of great relevance for water quality monitoring due to the occurrence of such emergent pollutants in the aquatic environment. As such, we describe here research concerning the use of multifunctional nanomaterials combining magnetic and plasmonic components. These nanomaterials have been prepared by decorating magnetite nanoparticles (MNP) with colloidal gold nanoparticles (Au NPs) of distinct particle size distributions. Several analytical conditions were investigated in order to optimize the surface enhanced Raman scattering (SERS) detection of penicillin G (PG) dissolved in water. In particular, the dependence of the SERS signal by using distinct sized Au NPs adsorbed at the MNP was investigated. Additionally, microscopic methods, including Raman confocal microscopy, were employed to characterize the SERS substrates and then to qualitatively detect penicillin G using such substrates. For example, magnetic-plasmonic nanocomposites can be employed for magnetically concentrate analyte molecules and their removal from solution. As a proof of concept, we applied magneto-plasmonic nanosorbents in the removal of aqueous penicillin G and demonstrate the possibility of SERS sensing this antibiotic.

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“…Nanoplasmonics is an emerging area of scientific research with a variety of applications in spectroscopy, metamaterials engineering, biosensing, lasing, photocatalysis, nonlinear and quantum optics [1][2][3][4][5][6][7][8]. This discipline deals with the study of collective oscillations of conduction electrons at metal-dielectric interfaces, which can be resonantly excited upon external irradiation.…”

Section: Introductionmentioning

confidence: 99%

Engineering 3D Multi-Branched Nanostructures for Ultra- Sensing Applications

Chirumamilla¹,

Chirumamilla²,

Roberts³

et al. 2018

Raman Spectroscopy

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The fabrication of plasmonic nanostructures with sub-10 nm gaps supporting extremely large electric field enhancement (hot-spot) has attained great interest over the past years, especially in ultra-sensing applications. The "hot-spot" concept has been successfully implemented in surface-enhanced Raman spectroscopy (SERS) through the extensive exploitation of localized surface plasmon resonances. However, the detection of analyte molecules at ultra-low concentrations, i.e., down to the single/few molecule level, still remains an open challenge due to the poor localization of analyte molecules onto the hot-spot region. On the other hand, three-dimensional nanostructures with multiple branches have been recently introduced, demonstrating breakthrough performances in hot-spot-mediated ultra-sensitive detection. Multi-branched nanostructures support high hot-spot densities with large electromagnetic (EM) fields at the interparticle separations and sharp edges, and exhibit excellent uniformity and morphological homogeneity, thus allowing for unprecedented reproducibility in the SERS signals. 3D multi-branched nanostructures with various configurations are engineered for high hot-spot density SERS substrates, showing an enhancement factor of 10 11 with a low detection limit of 1 fM. In this view, multi-branched nanostructures assume enormous importance in analyte detection at ultra-low concentrations, where the superior hot-spot density can promote the identification of probe molecules with increased contrast and spatial resolution.

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Hybrid nanostructures for SERS: materials development and chemical detection

Cited by 168 publications

References 511 publications

Microwave-assisted green synthesis of superparamagnetic nanoparticles using fruit peel extracts: surface engineering, <em>T</em><sub>2</sub> relaxometry, and photodynamic treatment potential

Microwave-assisted green synthesis of superparamagnetic nanoparticles using fruit peel extracts: surface engineering, <em>T</em><sub>2</sub> relaxometry, and photodynamic treatment potential

SERS Detection of Penicillin G Using Magnetite Decorated with Gold Nanoparticles

Engineering 3D Multi-Branched Nanostructures for Ultra- Sensing Applications

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