Design Considerations for a Portable Raman Probe Spectrometer for Field Forensics

Kelly, James Floyd; Blake, Thomas A.; Bernacki, Bruce E.; Johnson, Timothy J.

doi:10.1155/2012/938407

Cited by 11 publications

(10 citation statements)

References 34 publications

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“…We were able to construct calibration curves for all AgNPs even the smaller one, PVP-Ag15nm NPs, in seawater. The limits of detection using a portable Raman system, which has lower performance of the detector in comparison with the Raman confocal microscope [ 33 , 34 ], were in the mg/L range.…”

Section: Introductionmentioning

confidence: 99%

Detection of Silver Nanoparticles in Seawater Using Surface-Enhanced Raman Scattering

et al. 2021

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Nanomaterials significantly contribute to the development of new solutions to improve consumer products properties. Silver nanoparticles (AgNPs) are one of the most used, and as human exposure to such NPs increases, there is a growing need for analytical methods to identify and quantify nanoparticles present in the environment. Here we designed a detection strategy for AgNPs in seawater using surface-enhanced Raman Scattering (SERS). Three commercial AgNPs coated with polyvinylpyrrolidone (PVP) were used to determine the relative impact of size (PVP-15nmAgNPs and PVP-100nmAgNPs) and aggregation degree (predefined Ag aggregates, PVP-50–80nmAgNPs) on the SERS-based detection method. The study of colloidal stability and dissolution of selected AgNPs into seawater was carried out by dynamic light scattering and UV-vis spectroscopy. We showed that PVP-15nmAgNPs and PVP-100nmAgNPs remained colloidally stable, while PVP-50–80nmAgNPs formed bigger aggregates. We demonstrated that the SERS-based method developed here have the capacity to detect and quantify single and aggregates of AgNPs in seawater. The size had almost no effect on the detection limit (2.15 ± 1.22 mg/L for PVP-15nmAgNPs vs. 1.51 ± 0.71 mg/L for PVP-100nmAgNPs), while aggregation caused an increase of 2.9-fold (6.08 ± 1.21 mg/L). Our results demonstrate the importance of understanding NPs transformation in seawater since this can influence the detection method performance.

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Section: Introductionmentioning

confidence: 99%

Detection of Silver Nanoparticles in Seawater Using Surface-Enhanced Raman Scattering

et al. 2021

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“…For detection, the analyte solution could be dripped directly onto the Al-PSERS, with a 785 nm portable Raman spectrometer then used to identify the target analyte(s). Relative to UV wavebands, excitation with NIR light can minimize the occurrence of fluorescence and heating, thereby diminishing background noise during detection . In addition, portable Raman spectrometers are lighter and smaller than conventional microscopic Raman systems and, as such, are much easier to carry and transport.…”

Section: Resultsmentioning

confidence: 99%

Aluminum Plasmonic Nanoclusters for Paper-Based Surface-Enhanced Raman Spectroscopy

Chang

et al. 2022

Anal. Chem.

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Although surface-enhanced Raman spectroscopy (SERS) can rapidly identify molecular fingerprints and has great potential for analysis, the need for delicate plasmonic substrates and complex laboratory instruments seriously limits its applicability for on-site detection. This paper describes the development of an inexpensive aluminum nanoparticle (AlNP)-decorated paper that functions as a facile SERS-based detection platform (Al-PSERS). Polydopamine-protected AlNPs were chemically synthesized and then simply drop-cast onto a hydrophobic cellulose paper, forming a monolayer AlNP cluster array. Because of the abundance of hot spots arising from the plasmonic clusters, the inherent quasi-three-dimensional structure of the cellulose fibers, and the concentration effect of the hydrophobic surface, the Al-PSERS provided significant enhancements to the signal of various analytes, measured using a portable 785 nm Raman spectrometer. Near-field optical simulations and experimental spectroscopic results revealed that the local electric fields and corresponding SERS signal intensities of the AlNP array exhibited clear particle-length and cluster-size dependencies. Therefore, the Al-PSERS could be optimized to provide high sensitivity (enhancement factor: 2 × 103) and excellent reproducibility (variation: 8.72%). Moreover, the optimal Al-PSERS was capable of detecting colorants and environmental pollutants; for example, the detection limits of allura red and benzo[a]pyrene reached as low as 3.5 and 0.15 ppm, respectively. Furthermore, the Al-PSERS could rapidly identify illegal (rhodamine B) and edible (allura red, erythrosine) colorants from a mixture of multiple colorants or from adulterated candies. Because it facilitates rapid detection, is of low cost, and has minimal technical requirements, Al-PSERS should be applicable to on-site detection in, for example, food inspection and environmental monitoring.

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“…This includes adopting collection optics of shorter focal length and higher numerical aperture (N.A.). 50 Actually, in our setup the N.A. is relatively small (≈ 0.3) with respect to an average commercial Raman spectrometer.…”

Section: Estimation Of Minimal Limit Of Detectionmentioning

confidence: 99%

Short-wavelength Raman spectroscopy for in-situ water analysis: a feasibility study

Sterzi

Sambalova

Schneider³

et al. 2021

International Conference on X-Ray Lasers 2020

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Short-wavelength (λ < 260 nm) Raman spectroscopy offers an advantage of a generally higher sensitivity than Raman spectroscopy in the visible range. An application with high potential is its use for environmental water analysis targeting archetypal compounds that are present in industrial and urban sewage water. However, this application is feasible only if specific performance benchmarks are met. We validate the applicability of a simple and cost-effective deep-UV Raman spectrometer (λ exc = 236.5 nm). The analysis brings to the fore that the experimentally derived detection limits the studied archetypal compounds are to high by several orders of magnitude. We outline potential further development and associated limitations. These are the deterioration of the analysed species by photolysis as a consequence of the high photon energy and intensity, and the self absorption of the UV radiation. These effects are explained and partially corrected along a simple mathematical model from which a general limit of detection is estimated.

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Design Considerations for a Portable Raman Probe Spectrometer for Field Forensics

Cited by 11 publications

References 34 publications

Detection of Silver Nanoparticles in Seawater Using Surface-Enhanced Raman Scattering

Detection of Silver Nanoparticles in Seawater Using Surface-Enhanced Raman Scattering

Aluminum Plasmonic Nanoclusters for Paper-Based Surface-Enhanced Raman Spectroscopy

Short-wavelength Raman spectroscopy for in-situ water analysis: a feasibility study

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