A New Approach for Fluorescence Subtraction in Raman Spectroscopy

Li, Qun; Wang, Kerith R.; Wang, Sean X.

doi:10.1364/cleo_si.2011.cfn7

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…This is possible because the energy of Raman scattered photons changes with the excitation photon energy while that of fluorescent photons does not change, which is determined largely by the electronic structure of the materials or the molecules under study. And based on this principle, researchers have developed Shifted Excitation Raman Difference Spectroscopy (SERDS), which extracts Raman bands by comparing spectra collected through different excitation sources [98,99].…”

Section: Limitations Of Fluorescence Artifactsmentioning

confidence: 99%

In Situ and Surface-Enhanced Raman Spectroscopy Study of Electrode Materials in Solid Oxide Fuel Cells

Blinn

Chen

et al. 2018

Electrochem. Energ. Rev.

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Solid oxide fuel cells (SOFCs) represent next-generation energy sources with high energy conversion efficiencies, low pollutant emissions, good flexibility with a wide variety of fuels, and excellent modularity suitable for distributed power generation. As an electrochemical energy conversion device, the SOFC's performance and reliability depend sensitively on the catalytic activity and stability of electrode materials. To date, however, the development of electrode materials and microstructures is still based largely on trial-and-error methods because of the inadequate understanding of electrode process mechanisms. Therefore, the identification of key descriptors/properties for electrode materials or functional heterogeneous interfaces, especially under in situ/operando conditions, may provide guidance for the design of optimal electrode materials and microstructures. Here, Raman spectroscopy is ideally suited for the probing and mapping of chemical species present on electrode surfaces under operating conditions. And to boost the sensitivity toward electrode surface species, the surfaceenhanced Raman spectroscopy (SERS) technique can be employed, in which thermally robust SERS probes (e.g., Ag@ SiO 2 core-shell nanoparticles) are designed to make in situ/operando analysis possible. This review summarizes recent progresses in the investigation of SOFC electrode materials through Raman spectroscopic techniques, including topics of early stage carbon deposition (coking), coking-resistant anode modification, sulfur poisoning, and cathode degradation. In addition, future perspectives for utilizing the in situ/operando SERS for investigations of other electrochemical surfaces and interfaces are also discussed.

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Section: Limitations Of Fluorescence Artifactsmentioning

confidence: 99%

In Situ and Surface-Enhanced Raman Spectroscopy Study of Electrode Materials in Solid Oxide Fuel Cells

Blinn

Chen

et al. 2018

Electrochem. Energ. Rev.

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“…Detecting very small signals on top of large underlying backgrounds has always been a holy grail in optical spectroscopy, and over the years, several methods have been developed for that purpose. − The different methods use a combination of hardware and data analysis tricks to achieve the stated goal, and they differ in the ultimate level of background rejection that can be achieved. The particular spectroscopic problems that these methods can potentially address are multiple, but a longstanding and canonical example is fluorescence rejection in resonant Raman (RR) spectroscopy. , …”

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confidence: 99%

Tiny Peaks vs Mega Backgrounds: A General Spectroscopic Method with Applications in Resonant Raman Scattering and Atmospheric Absorptions

Auguié

Reigue

et al. 2012

Anal. Chem.

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A simple method using standard spectrometers with charge-coupled device (CCD) detectors is described to routinely measure background-corrected spectra in situations where the signal is composed of weak spectral features (such as Raman peaks or absorption lines) engulfed in a much stronger (by as much as ∼10(5)) broad background. The principle of the method is to subtract the dominant fixed-structure noise and obtain a shot-noise limited spectrum. The final noise level can therefore be reduced as desired by sufficient integration time. The method requires multiple shifts of the diffraction gratings to extract the pixel-dependent noise structure, which is then used as a flat-field correction. An original peak-retrieval procedure is proposed, demonstrating accurate determination of peak lineshapes and linewidths and robustness on practical examples where conventional methods would not be applicable. Examples are discussed to illustrate the potential of the technique to perform routine resonant Raman measurements of fluorescent dyes with high quantum yield, using conventional Raman systems. The method can equally be applied to other situations where small features are masked by a broad overwhelming background. An explicit example is given with the measurement of weak absorption lines in atmospheric gases.

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A New Approach for Fluorescence Subtraction in Raman Spectroscopy

Cited by 2 publications

References 5 publications

In Situ and Surface-Enhanced Raman Spectroscopy Study of Electrode Materials in Solid Oxide Fuel Cells

In Situ and Surface-Enhanced Raman Spectroscopy Study of Electrode Materials in Solid Oxide Fuel Cells

Tiny Peaks vs Mega Backgrounds: A General Spectroscopic Method with Applications in Resonant Raman Scattering and Atmospheric Absorptions

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