Spatially compressed dual-wavelength excitation Raman spectrometer

Cooper, John B.; Marshall, Sarah; Jones, Richard W.; Abdelkader, Mohamed F.; Wise, Kent L.

doi:10.1364/ao.53.003333

Cited by 43 publications

(38 citation statements)

References 16 publications

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“…The spectrometer has been described in detail previously (Cooper et al 2013(Cooper et al , 2014. The excitation wavelength was adjusted 32 times by setting the temperature of the laser to predetermined values that provide 1 cm −1 spacing between each shift.…”

Section: Raman Spectroscopymentioning

confidence: 99%

Surface oxygenation of biochar through ozonization for dramatically enhancing cation exchange capacity

Huff

Marshall

Saeed

et al. 2018

Bioresour. Bioprocess.

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Background: Biochar cation exchange capacity (CEC) is a key property that is central to biochar environmental applications including the retention of soil nutrients in soil amendment and removal of certain pollutants in water-filtration applications.Results: This study reports an innovative biochar-ozonization process that dramatically increases the CEC value of biochars by a factor of 2. The ozonized biochars also show great improvement on adsorption of methylene blue by as much as a factor of about 5. In this study, biochar samples treated with and without ozone were analyzed by means of pH and CEC assays, water field capacity measurement, elemental analysis, methylene blue adsorption, and Raman spectroscopy. Gaseous products' analyses were carried out using an online universal gas analyzer over the duration of ozone treatments, and temperature changes were monitored using a thermal imaging camera. The results demonstrate a doubling of CEC with a concomitantly large drop in pH of the ozonized biochar compared with the untreated sample, brought about by the creation of acidic oxygen-functional groups on biochar surface, which may represent a significant progress toward the viability of employing biochar as a soil amendment for sustainability on Earth. Conclusions:This biochar-ozonization process technology has the potential to effectively convert conventional biochars into surface-oxygenated products with dramatically higher CEC values.

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Section: Raman Spectroscopymentioning

confidence: 99%

Surface oxygenation of biochar through ozonization for dramatically enhancing cation exchange capacity

Huff

Marshall

Saeed

et al. 2018

Bioresour. Bioprocess.

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“…[18] Modulated-wavelength Raman spectroscopy was suggested to suppress the fluorescence background with as uperior signal-to-noise ratio. [21] Fluores-cence suppression techniques in Raman spectroscopy are reviewed in Ref. Subtraction or principal component analysis (PCA)r outines can separate the fluorescence contributions from the Raman signals.…”

Section: Abrief Introduction To the Theory Of Linear And Nonlinear Ramentioning

confidence: 99%

Label‐Free Molecular Imaging of Biological Cells and Tissues by Linear and Nonlinear Raman Spectroscopic Approaches

et al. 2017

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Raman spectroscopy is an emerging technique in bioanalysis and imaging of biomaterials owing to its unique capability of generating spectroscopic fingerprints. Imaging cells and tissues by Raman microspectroscopy represents a nondestructive and label-free approach. All components of cells or tissues contribute to the Raman signals, giving rise to complex spectral signatures. Resonance Raman scattering and surface-enhanced Raman scattering can be used to enhance the signals and reduce the spectral complexity. Raman-active labels can be introduced to increase specificity and multimodality. In addition, nonlinear coherent Raman scattering methods offer higher sensitivities, which enable the rapid imaging of larger sampling areas. Finally, fiber-based imaging techniques pave the way towards in vivo applications of Raman spectroscopy. This Review summarizes the basic principles behind medical Raman imaging and its progress since 2012.

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“…Shifted excitation Raman difference spectroscopy (SERDS) and related methods have been demonstrated as powerful spectroscopic tools separating the Raman signals from background interferences . For SERDS, a laser light source with two slightly shifted excitation lines is necessary, generating two slightly shifted Raman spectra.…”

Section: Introductionmentioning

confidence: 99%

A portable shifted excitation Raman difference spectroscopy system: device and field demonstration

Maiwald

Müller

Tränkle

2016

J. Raman Spectrosc.

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In this paper, we present a portable shifted excitation Raman difference spectroscopy (SERDS) system applied in outdoor experiments. A dual-wavelength diode laser emitting at 785 nm is used as excitation light source. The diode laser provides two individually controllable excitation lines at 785 nm with a spectral distance of about 10 cm À1 for SERDS. This monolithic light source is implemented into a compact handheld Raman probe. Both components were developed and fabricated in-house. SERDS measurements are performed in an apple orchard, and apples and green apple leafs are used as test samples. For each excitation wavelength, a single Raman spectrum is measured with 50 mW at the sample. Strong background interference from ambient daylight and laser-induced fluorescence obscure the Raman signals. SERDS efficiently separates the wanted Raman signals from the disturbing background signals. For the Raman spectroscopic investigations of green leafs, one accumulation with an exposure time of 0.2 s was used for each excitation wavelength to avoid detector saturation. An 11-fold improvement of the signal-tobackground noise is achieved using SERDS. The results demonstrate the suitability of the portable SERDS system for rapid outdoor Raman investigations.

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Spatially compressed dual-wavelength excitation Raman spectrometer

Cited by 43 publications

References 16 publications

Surface oxygenation of biochar through ozonization for dramatically enhancing cation exchange capacity

Surface oxygenation of biochar through ozonization for dramatically enhancing cation exchange capacity

Label‐Free Molecular Imaging of Biological Cells and Tissues by Linear and Nonlinear Raman Spectroscopic Approaches

A portable shifted excitation Raman difference spectroscopy system: device and field demonstration

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