Filter-based surface-enhanced Raman spectroscopy for rapid and sensitive detection of the fungicide ferbam in water

Gao, Siyue; Zhang, Zhiyun; He, Lili

doi:10.1080/03067319.2016.1272677

Cited by 16 publications

(12 citation statements)

References 26 publications

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“…Surface-enhanced Raman spectroscopy (SERS) is a powerful, nondestructive, and ultrasensitive analytical technique, which enables easy and quick detection of analytes even at the single-molecule level. − In SERS, Raman signals of laser-irradiated polarizable molecules are enhanced by large plasmonically enhanced local fields at junctions or surfaces of metallic nanostructures. , It significantly extends the application of traditional Raman spectroscopy by providing molecule-specific chemical fingerprints with increased sensitivity by surpassing the inherent weak signal intensity of Raman scattering . SERS finds significant applications in diverse areas, e.g., forensic science, , food and environment safety, − biomolecular analysis, cancer diagnosis, sensing of pesticides, pollutants, heavy metals, etc. − In addition, exploration of single molecules [i.e., single-molecule SERS (SMSERS)] is also extremely important for a deeper understanding of the governing principles in SERS. Earlier reports claimed that SERS enhancement factors (EFs) on the order of ∼10 14 to 10 15 were necessary for SM detection. , It was postulated that such high EFs in SERS resulted from multiplicative contribution of two factors: local electromagnetic (EM) field effect and chemical enhancement (CE) .…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Ag–Cu Alloy Microflowers as SERS Substrates with Single-Molecule Detection Limit

Kaja

Nag

2021

Langmuir

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Bimetallic Ag–Cu alloy microflowers with tunable surface compositions were fabricated as surface-enhanced Raman spectroscopy (SERS) substrates with a limit of detection in the zeptomolar range for the analyte molecule rhodamine 6G (R6G). The substrates were prepared on a glass coverslip through a bottom-up strategy by simple thermolysis of metal-alkyl ammonium halide precursors. The reaction temperature and composition of the alloy were varied sequentially to find out the maximum SERS efficiency from the substrates. While UV–vis spectroscopy was employed to characterize the optical properties of the substrates, the bulk and surface compositions of the microflowers were determined using energy-dispersive X-ray fluorescence (ED-XRF) and X-ray photoelectron spectroscopy (XPS) techniques, respectively. Also, the structural and morphological characterizations of the substrates were performed by X-ray diffraction and scanning electron microscope (SEM), respectively. For alloys, the ED-XRF studies confirmed that the bulk compositions matched with the feed ratio, while the surface compositions were found to be rich in copper in the form of both elementary copper and copper oxide, as revealed by XPS studies. From the efficiency studies for different compositions prepared, it was found that 10% Ag–Cu alloy microflowers produced the maximum SERS intensity for resonant R6G molecules as probes. In fact, R6G evidences a 50-fold enhancement in SERS spectra with 10% alloy microflowers as against pure Ag microflowers. Using 1, 2, 3-benzotriazole as a nonresonant Raman probe, uniform enhancement factors on the order of ≈108 were achieved from different parts of the 10% Ag–Cu alloy microflower. The same substrate showed excellent Raman response for detecting R6G at very low concentrations such as 10 zM, leading to detection and analysis of SERS spectra from a single R6G molecule.

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Section: Introductionmentioning

confidence: 99%

Bimetallic Ag–Cu Alloy Microflowers as SERS Substrates with Single-Molecule Detection Limit

Kaja

Nag

2021

Langmuir

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“…Some modification methods of the substrate may further optimize the linear relationship. Extraction and enrichment techniques of pesticides, such as filtration, 63 solid-phase extraction, 64 or microfluidic technology, 65 will be conducive to avoid the interference when applying to real samples.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Controllable Self-Assembly of SERS Hotspots in Liquid Environment

Tang

Chen

et al. 2021

Langmuir

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Controllable synthesis of novel metal nanoparticles and effective capture of hotspots are of great significance for SERS (surface-enhanced Raman spectroscopy) detection. Therefore, in this paper, a green controllable synthesis method of gold nanoparticle was achieved via epigallocatechin gallate reduction. Different morphologies of gold nanoparticles were synthesized just by changing the solution pH values, and the growth kinetics of AuNPs (gold nanoparticles) were systematically studied. The synthetic AuNPs were put in a droplet to study dynamic variations of self-assembly SERS hotspots from the liquid sol state to the solid dry state. The addition of halogen ions in the droplet can controllably regulate the self-assembly three-dimensional hotspot model of gold nanoparticles in the evaporation process of a droplet, during which the most enhancement effect can be easily captured. The dynamically changing images of nanoparticles in the process were graphically described based on the internal interaction forces of a droplet. Two stronger areas in the changes of SERS intensity were achieved with a high concentration of halogen ions, while only one maximum intensity area was obtained with a low concentration of halogen ions added. This method can effectively avoid complex and unpredictable microenvironments of SERS substrates in the liquid drop, further improving the reproducibility of SERS detection as well as broadening it to biological applications.

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“…Silver membrane filters elicited the strongest intensities from microplastics both alone and in complex samples, particularly plastic + /PM + 4 h filters. It is highly likely that the silver enables surface-enhanced Raman spectroscopy . However, the patterned surface of the silver membrane filters, while smooth, did not achieve the greatest optical contrast between microplastics and the filter surface.…”

Section: Discussionmentioning

confidence: 99%

Raman Spectral Imaging for the Detection of Inhalable Microplastics in Ambient Particulate Matter Samples

Wright

Levermore

Kelly

2019

Environ. Sci. Technol.

111

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Microplastics are ubiquitous contaminants, with preliminary evidence indicating they are a novel component of air pollution. This presents a plausible inhalation exposure pathway, should microplastics occur in the inhalable size range; however, this remains an analytical challenge. Here, we develop a filter-based sampling method compatible with both air quality monitoring and Raman spectral imaging (RSI) for the detection of inhalable-sized microplastics. Clean and particulate matter (PM) contaminated filters of a range of compositions were screened. RSI was validated using a plastic microbead suspension (poly(methyl methacrylate) (5–27 μm), polyethylene (10–27 μm), and polystyrene (4 and 10 μm)). Filters were loaded with the suspension before being analyzed. RSI analysis was conducted using a univariate analysis, fitting unique plastic bands to the spectral data sets, where high spatial intensity indicated the presence of microplastics. Inhalable microplastics were not visibly detectable against quartz or spectroscopically detectable against polytetrafluoroethylene (PTFE)- and alumina-based filters. While microplastics were detectable against cellulose, the PM-contaminated filters (4 and 24 h) burned during analysis. The greatest intensities for microplastics were observed against the silver membrane filter, and inhalable microplastics were still detectable in a 24 h PM sample. These findings will facilitate the acquisition of inhalable microplastic concentrations, which are necessary for understanding microplastic exposure and, ultimately, what their potential role in PM-associated health effects might be.

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Filter-based surface-enhanced Raman spectroscopy for rapid and sensitive detection of the fungicide ferbam in water

Cited by 16 publications

References 26 publications

Bimetallic Ag–Cu Alloy Microflowers as SERS Substrates with Single-Molecule Detection Limit

Bimetallic Ag–Cu Alloy Microflowers as SERS Substrates with Single-Molecule Detection Limit

Controllable Self-Assembly of SERS Hotspots in Liquid Environment

Raman Spectral Imaging for the Detection of Inhalable Microplastics in Ambient Particulate Matter Samples

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