Critical evaluation of portable Raman spectrometers: From rock outcrops and planetary analogs to cultural heritage – A review

Jehlička, Jan; Culka, Adam

doi:10.1016/j.aca.2021.339027

Cited by 39 publications

(33 citation statements)

References 262 publications

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“…[1][2][3][4][5] Surface-enhanced Raman spectroscopy (SERS), a method for signicantly enhancing inherently weak Raman scattering by localized surface plasmon resonance and measuring the enhanced Raman scattering signal for nondestructive structural analysis of samples, [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] is an effective tool to provide the ability by virtue of its high sensitivity (even down to single molecules) and rapid label-free signal detection (down to ∼1 s or less) as well as the availability of portable Raman spectrometers (down to the passport size and 0.5 kg). [24][25][26] SERS is advantageous over other analytical methods such as mass spectrometry, gas chromatography, liquid chromatography, laser-induced breakdown spectroscopy, and uorescence detection because these methods require bulky and costly equipment, are timeconsuming in sample collection and preparation, or lack the capability of nondestructive, multiplex detection. [1][2][3][4] In fact, SERS has been widely used in trace detection of hazardous chemicals, pesticide residues, microplastics, glucose in whole blood, viruses of infectious diseases, and controlled drugs.…”

Section: Introductionmentioning

confidence: 99%

Place & Play SERS: sample collection and preparation-free surface-enhanced Raman spectroscopy

et al. 2023

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Section: Introductionmentioning

confidence: 99%

Place & Play SERS: sample collection and preparation-free surface-enhanced Raman spectroscopy

et al. 2023

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“…Raman spectroscopy belongs to the techniques that can be used for in situ measurements by the use of handheld modern devices of relatively high resolution, nowadays available in the market. The feature of portability has made Raman spectroscopy appealing for industries, e.g., cosmetics and pharmaceutical, mineralogy, art and archaeology, as well as for testing materials in the field [ 20 , 21 , 22 ]. Portable Raman instrumentation is also employed in the chemotaxonomy of plants, where fast and accurate information can be collected from different parts of the plant in its natural environment [ 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

μ-Raman Determination of Essential Oils’ Constituents from Distillates and Leaf Glands of Origanum Plants

et al. 2023

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A novel, inexpensive and simple experimental setup for collecting μ-Raman spectra of volatile liquids in very small quantities was developed. It takes advantage of capillary forces to detain minute volatile liquid volumes. Spectra of volatile and even scattering or absorbing media can be measured more effectively. The method is used to facilitate the collection of intensity-consistent Raman spectra from a series of reference compounds present in Origanum essential oils, in order to quantify their constituents by multiple linear regression. Wild grown Origanum plants, collected from five different regions in Greece and taxonomically identified as O. onites, O. vulgare subsp. hirtum and O. vulgare subsp. vulgare, were appropriately distilled to acquire their essential oils. Comparison of the Raman results with those from headspace gas chromatography–mass spectrometry (HS GC-MS) confirmed the successful relative quantification of the most abundant essential oil constituents, highlighting the similarities and differences of the three Origanum taxa examined. Finally, it is demonstrated that directly measuring the leaf peltate glandular hairs yields exploitable results to identify the main components of the essential oil they contain, underlining the potential of in situ (field or industry) measurements utilizing microscope-equipped portable Raman spectrometers.

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Section: Introductionmentioning

confidence: 99%

“…The technical specifications of the spectrometer, such as the excitation wavelength and spectral resolution, along with the measurement setup, then play a crucial role in obtaining spectral data of sufficient quality, which is particularly relevant for portable Raman spectrometers. [49][50][51] The aim of this work is to explore and demonstrate the abilities of Raman spectroscopy in the discrimination of Al sulfates within complex and intergrown aggregates.…”

Section: Introductionmentioning

confidence: 99%

Raman spectroscopy of anhydrous and hydrated aluminum sulfates: Experience from burning coal heaps

Košek

Culka

Rousaki

et al. 2022

J Raman Spectroscopy

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Hydrated aluminum‐rich sulfates belong to less widespread secondary minerals on Mars, which are probably connected with hydrothermal alterations. On Earth, such sulfates result from acidic weathering of aluminosilicates, and their formation is controlled by factors such as pH, temperature, or water activity. Physical–chemical conditions can be reconstructed if specific sulfate phases are detected, and therefore, the investigation of sulfate assemblages in high‐temperature settings is important for planetology and exobiology research. Raman spectroscopy is a powerful analytical tool for the discrimination of sulfates, and the degree of hydration, which is a sensitive marker of temperature conditions, can be tracked using this method. However, spectral similarities of sulfates and metastability and rapid transformations may hinder their correct identification. We take advantage of in situ and laboratory Raman spectroscopy to characterize uncommon anhydrous and hydrated Al‐NH4 sulfate mineralogy which forms under elevated temperature at the Anna burning coal waste dump, Alsdorf, Germany, and can be considered as analogous to fumarolic environments. We detected a suite of hydrated Al sulfates (e.g. alunogen, khademite, and tschermigite) in the medium‐temperature zones (~50°C). To minimize possible rehydration processes, we deployed two miniaturized Raman spectrometers (532 and 1064 nm) for field investigations in the high‐temperature zone (~130°C to 150°C). Mixtures of anhydrous (godovikovite and millosevichite) and hydrated phases along with intermediate phases were detected in the field as well as in the laboratory. Such observations are consistent with the premise that the degree hydration of sulfates increase with decreasing temperature. These results confirm that Raman spectroscopy is, despite several analytical challenges, capable of distinguishing Al sulfates, and their hydration states, within complex aggregates and crusts, and future applications in planetary research are promising.

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Critical evaluation of portable Raman spectrometers: From rock outcrops and planetary analogs to cultural heritage – A review

Cited by 39 publications

References 262 publications

Place & Play SERS: sample collection and preparation-free surface-enhanced Raman spectroscopy

Place & Play SERS: sample collection and preparation-free surface-enhanced Raman spectroscopy

μ-Raman Determination of Essential Oils’ Constituents from Distillates and Leaf Glands of Origanum Plants

Raman spectroscopy of anhydrous and hydrated aluminum sulfates: Experience from burning coal heaps

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