Surface enhanced Raman scattering due to interstitial gold nanoparticles into SiO2 spheres array

Romero-Cruz, L.A.; Santos-Gómez, A.; Palomino-Ovando, M.; Hernández-Cristóbal, Orlando; Sánchez-Mora, E.; González, A. L.; Toledo-Solano, M.

doi:10.1016/j.spmi.2018.02.022

Cited by 15 publications

(6 citation statements)

References 54 publications

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“…Consequently, the Au 3 -PC strip with high SERS activity could be employed to realize trace bactericide detection for real applications. For assignments in detail, in the SERS spectrum of MB, 448 and 500 cm –1 are attributed to C–N–C skeleton deformation and 1626 cm –1 is attributed to the ring C–C stretching . SERS spectra of MG and CV seem quite similar due to the similarity of their structures (Figure S10), and apart from similar SERS peaks at 437 and 524 cm –1 attributed to the out-of-plane vibration of the phenyl–C-phenyl group and the skeleton vibration, we can distinguished MG from CV with other SERS peaks.…”

Section: Resultsmentioning

confidence: 91%

Au Sputtered Paper Chromatography Tandem Raman Platform for Sensitive Detection of Heavy Metal Ions

Song

Fang

et al. 2020

ACS Sens.

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Surface-enhanced Raman scattering (SERS) is a powerful technique for sensitive detection, but it normally has difficulty in multicomponent detection in a complex system, especially for simultaneous analysis of mixture of heavy metal ions. In this work, a simple paper chromatography tandem SERS (PC-SERS) separation/detection platform is proposed by ion-sputtering gold on a filter paper. Based on SEM results, the great electromagnetic field inside nanogaps of Au nanoislands on the paper surface is evaluated with FDTD simulation. It is found that the PC-SERS platform has good uniformity (RSD = 10.12%) and long-time stability. The as-prepared PC-SERS platform was applied to efficiently separate and detect a mixture of pesticides (MG, MB, and CV) in pond water without any pretreatment process, and the limits of detection (LODs) were down to 10 nM. As a crucial application for food safety, several heavy metal ions such as Cd 2+ , Cu 2+ , and Ni 2+ in grinded rice were successfully detected by the PC-SERS method taking advantage of the sandwich structure based on 4-mercaptobenzoic acid (4-MBA) molecules, which were modified onto sputtering the Au filter paper and gold nanoparticles (Au NPs) to link metal ions and acted as Raman signal molecules. All the LODs for metal ions were down to 1 μM. Due to the easiness of fabrication, good reproducibility, and simple pretreatment step, the PC-SERS platform holds promise in multicomponent detection in a real sample.

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Section: Resultsmentioning

confidence: 91%

Au Sputtered Paper Chromatography Tandem Raman Platform for Sensitive Detection of Heavy Metal Ions

Song

Fang

et al. 2020

ACS Sens.

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“…The intense sharp peak observed at around 300 cm −1 and less intense peak at 600 cm −1 is ascribed to the CdS fundamental longitudinal optical mode phonon (1LO) and its overtone (2LO), respectively [30]. There was no peak observed for SiO 2 in SiO 2 /CdS composites, although SiO 2 gave most noticeable bands at 436, 716, 1265, 1392, 1665, 1704 and 1760 cm -1 [31], this can be caused by amorphous nature of SiO 2 and also very less intense bands only observed for pure SiO 2 [31]. As shown in Figs.…”

Section: Characterization Of the Prepared Compositesmentioning

confidence: 94%

Synthesis, characterization of porphyrin and CdS modified spherical shaped SiO2 for Reactive Red 120 degradation under direct sunlight

Krishnakumar

Ravikumar

Pandiyan

et al. 2020

Journal of Molecular Structure

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…However, it is easier to incorporate Au on crystal colloids than Ag. From the several interesting reports about the synthesis and characterization of composite colloidal thin films with Au, we can highlight the following aspects [7,17,32]:…”

Section: Composite Thin Film: Effect Of Metal Nps' Concentrationmentioning

confidence: 99%

“…Recently, we reported SERS-substrate films with the advantage of a rough surface provided by a periodic array of SiO 2 spheres and Au NPs [32]. The synthesis of colloidal SiO 2 spheres was performed following the methods of Stöber [33] and Razo [5], while Au NP colloid was prepared adopting the method introduced by Turkevich [34,35].…”

Section: Evidence Of Incorporation Of Metal Npsmentioning

confidence: 99%

“…Besides, the surface plasmon resonance of the NPs is located at 522 nm (see Ref. [32]). The as-synthesized SiO 2 spheres and Au NPs were used to obtain composite films with low, medium, and high volume concentrations of Au NPs (composite 1, 2, and 3, respectively), accordingly to the procedure reported by Cong et al [36], and that previously has been employed by some of us to prepare the opal/ Fe 3 O 4 colloidal crystal [37].…”

Section: Evidence Of Incorporation Of Metal Npsmentioning

confidence: 99%

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Metallo-Dielectric Colloidal Films as SERS Substrate

González¹,

Santos-Gómez²,

Toledo-Solano³

2020

Nanorods and Nanocomposites

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Along this chapter, we probe that the discrete dipole approximation models fairly well the optical response of periodic systems. Herein, we use it to model the reflectance and transmittance, at normal incidence, of colloidal films made of SiO 2 spheres. As the thickness increases from 1 to 12 layers, the photonic band gap shifts to the blue tending to the value corresponding to a 3D opal, 442 nm. A film with more than eight layers resembles the bulk properties of a 3D opal. Our results are compared to a real sample. Besides, we show that taking advantage of the wide and asymmetrical absorbance spectrum of an opal with Au NPs is possible to identify the contribution of each component in the overall spectrum, through a deconvolution analysis. Finally, we present the electric field intensity as the content of metal NP increases in a monolayer. We consider NPs one order of magnitude smaller than the silica spheres, and then, 6, 9, and 17 NPs are hosted in the void. Similar average electric field intensities, about 11 times the incident intensity, are obtained with Au and Ag NPs. But, the spots with these intensities cover a bigger area with Ag NPs than with Au NPs.

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Surface enhanced Raman scattering due to interstitial gold nanoparticles into SiO2 spheres array

Cited by 15 publications

References 54 publications

Au Sputtered Paper Chromatography Tandem Raman Platform for Sensitive Detection of Heavy Metal Ions

Au Sputtered Paper Chromatography Tandem Raman Platform for Sensitive Detection of Heavy Metal Ions

Synthesis, characterization of porphyrin and CdS modified spherical shaped SiO2 for Reactive Red 120 degradation under direct sunlight

Metallo-Dielectric Colloidal Films as SERS Substrate

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