Water monitoring by optofluidic Raman spectroscopy for in situ applications

Persichetti, G.; Bernini, Romeo

doi:10.1016/j.talanta.2016.03.102

Cited by 14 publications

(5 citation statements)

References 44 publications

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“…Persichetti et al used an OJW to detect common pollutants in water, such as nitrate, sulfate, and benzene. 69 Two side-by-side optical fibers excited the whole fluid and collected backscatter signals. The detection limit of pollutants was about 40 mg/L, which is lower than the minimum standard for the content of related substances in drinking water.…”

Section: Optofluidic Jet Waveguidementioning

confidence: 99%

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Waveguide‐based Raman enhancement strategies

Zhao,

Cao,

et al. 2023

J Raman Spectroscopy

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Waveguide‐enhanced Raman scattering (WERS) is a powerful branch of enhanced Raman technologies that has gained significant progress in recent years because of its advantages, such as reproducibility and robustness. As a complementary tool to surface‐enhanced Raman spectroscopy (SERS), WERS provides a powerful solution for reproducible quantification of analytes. According to different Raman enhancement mechanisms, five major WERS implementation strategies, namely, (1) single‐mode dielectric waveguide, (2) liquid core waveguide, (3) metal cladding waveguide, (4) resonance mirror waveguide, and (5) double metal cladding waveguide, are classified and described in detail in this review. The flexibility of WERS structures makes them easy to be integrated with 2D devices to obtain a complete on‐chip detection scheme, allowing the WERS chip to combine excitation, detection, and data analysis in integrated chips, providing a powerful prospect for real‐time and on‐site analysis of target samples. This article highlights the principles, implementations, and application scenarios of WERS techniques and evaluates their advantages and limitations, respectively. Finally, the strengths and weaknesses of WERS techniques are summarized, and promising future applications are proposed. This review provides a panoramic view for researchers interested in waveguide‐enhanced Raman technology.

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Section: Optofluidic Jet Waveguidementioning

confidence: 99%

“…Persichetti et al used an OJW to detect common pollutants in water, such as nitrate, sulfate, and benzene 69 . Two side‐by‐side optical fibers excited the whole fluid and collected backscatter signals.…”

Section: Wers Structure Based On Long‐range Enhancementmentioning

confidence: 99%

Waveguide‐based Raman enhancement strategies

Zhao,

Cao,

et al. 2023

J Raman Spectroscopy

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“…In contrast, Raman spectroscopy is optimally fitted for chemical identification of the phosphorus‐containing molecules 13 . The problem of low cross‐section of Raman scattering inherent to conventional Raman (micro)spectroscopy (compared with other analytical techniques) can be overridden using surface enhancement.…”

Section: Introductionmentioning

confidence: 99%

Surface‐enhanced Raman spectroscopy investigation of PO43− to Ag/Al₂O₃ nanopatterned substrates binding and its dynamics for sensitive detection of phosphate in water

Hemzal,

Prášek,

Hrdý

et al. 2023

J Raman Spectroscopy

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We provide fast and sensitive detection of phosphate dissolved in water using Raman spectroscopy. To this end, phosphate‐scavenging planar core/shell surface‐enhanced Raman spectroscopy (SERS) probes consisting of Al2O3‐capped Ag nanopatterned sapphire substrate were prepared and optimized. Thanks to scavenging, the probes provide enhancement sufficient to readily detect phosphate at levels occurring in water sources. In particular, the SERS probes were successfully tested for selective detection of all phosphate ions and down to 1 M phosphate concentration (30 g/L of phosphorus in the solution). The novelty of our contribution lies in real‐time SERS monitoring of the phosphate Raman markers, which allowed to study the dynamics of phosphate interaction with the nano‐structured surface of the probes. Under natural conditions (neutral to basic environment), the phosphates adsorb on the probes in form of PO in two steps.

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“…Raman spectroscopy has been widely deployed over the past years. For example, surface-enhanced Raman spectroscopy (SERS) seems to be a promising method for water monitoring [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. However, limitations still exist with respect to the detectability of Raman-inactive substances as well as the superposition of Raman signals by fluorescence, suggesting a combination of both detection methods to become more flexible in application.…”

Section: Introductionmentioning

confidence: 99%

Application of Laser-Induced, Deep UV Raman Spectroscopy and Artificial Intelligence in Real-Time Environmental Monitoring—Solutions and First Results

Post

Brülisauer²,

Waldschläger

et al. 2021

Sensors

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Environmental monitoring of aquatic systems is the key requirement for sustainable environmental protection and future drinking water supply. The quality of water resources depends on the effectiveness of water treatment plants to reduce chemical pollutants, such as nitrates, pharmaceuticals, or microplastics. Changes in water quality can vary rapidly and must be monitored in real-time, enabling immediate action. In this study, we test the feasibility of a deep UV Raman spectrometer for the detection of nitrate/nitrite, selected pharmaceuticals and the most widespread microplastic polymers. Software utilizing artificial intelligence, such as a convolutional neural network, is trained for recognizing typical spectral patterns of individual pollutants, once processed by mathematical filters and machine learning algorithms. The results of an initial experimental study show that nitrates and nitrites can be detected and quantified. The detection of nitrates poses some challenges due to the noise-to-signal ratio and background and related noise due to water or other materials. Selected pharmaceutical substances could be detected via Raman spectroscopy, but not at concentrations in the µg/l or ng/l range. Microplastic particles are non-soluble substances and can be detected and identified, but the measurements suffer from the heterogeneous distribution of the microparticles in flow experiments.

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Water monitoring by optofluidic Raman spectroscopy for in situ applications

Cited by 14 publications

References 44 publications

Waveguide‐based Raman enhancement strategies

Waveguide‐based Raman enhancement strategies

Surface‐enhanced Raman spectroscopy investigation of PO43− to Ag/Al₂O₃ nanopatterned substrates binding and its dynamics for sensitive detection of phosphate in water

Application of Laser-Induced, Deep UV Raman Spectroscopy and Artificial Intelligence in Real-Time Environmental Monitoring—Solutions and First Results

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Water monitoring by optofluidic Raman spectroscopy for in situ applications

Cited by 14 publications

References 44 publications

Waveguide‐based Raman enhancement strategies

Waveguide‐based Raman enhancement strategies

Surface‐enhanced Raman spectroscopy investigation of PO43− to Ag/Al2O3 nanopatterned substrates binding and its dynamics for sensitive detection of phosphate in water

Application of Laser-Induced, Deep UV Raman Spectroscopy and Artificial Intelligence in Real-Time Environmental Monitoring—Solutions and First Results

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Product

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Surface‐enhanced Raman spectroscopy investigation of PO43− to Ag/Al₂O₃ nanopatterned substrates binding and its dynamics for sensitive detection of phosphate in water