Advantages and developments of Raman spectroscopy for electroceramics

Abstract

Despite being applied with success in many fields of materials science, Raman spectroscopy is not yet determinant in the study of electroceramics. Recent experimental and theoretical developments, however, should increase the popularity of Raman spectroscopy in this class of materials. In this review, we outline the fields of application of Raman spectroscopy and microscopy in various electroceramic systems, defining current key bottlenecks and explaining promising recent developments. We focus our attention on recent experimental developments, including coupling Raman spectroscopy with other methodologies and modelling approaches involving both the model-based data interpretation and the ab initio calculation of realistic Raman spectra.

CVD-Grown Monolayer MoS2 and GaN Thin Film Heterostructure for a Self-Powered and Bidirectional Photodetector with an Extended Active Spectrum

“…The E 2 (high) Raman mode for the unstressed epitaxial GaN is usually observed at 567.6 cm –1 . , In the case of the heterostructure, the observed peak appears at 570.1 cm –1 , indicating a shift toward a higher wavenumber. This blue shift in the Raman spectra is associated with changes in the chemical bond length of the molecules . Specifically, a shorter bond length results in a higher wavenumber shift .…”

“…This blue shift in the Raman spectra is associated with changes in the chemical bond length of the molecules. 33 Specifically, a shorter bond length results in a higher wavenumber shift. 34 This observation aligns with the anticipated compressive stress owing to GaN lattice mismatch with sapphire substrates.…”

Effect of Sulfate and Carbonate Ions on Lithium Carbonate Precipitation from a Low Concentration Lithium Containing Solution

“…The compounds present in the precipitates were analyzed by using a Raman spectrometer (UV–vis–NIR Dispersive Micro Confocal Hyperspectral Raman Imaging Spectrometer, Horiba). The spectra from the precipitates were compared with that of standard Li 2 CO 3 using the same measurement settings, i.e., 100× magnification objective lens, 532 nm laser, 199.981 holes, 1800 grating, 100% ND filter, and an acquisition time of 5 s. Furthermore, the crystalline quality of precipitates was compared using full width at half-maximum (fwhm) analysis of the Raman spectrum, , employing the Gaussian–Lorentzian method. Additionally, the objective lens of the Raman spectrometer enabled the observation of the morphology of the formed crystal solids.…”

Raman Flow Cytometry and Its Biomedical Applications

“…Resonance Raman spectroscopy (RRS) uses laser wavelengths that match or are close to the molecular absorption bands to enhance signals of specific vibrational modes, mainly applied in the study of biological molecules like proteins and DNA [48]. Additionally, coherent anti-Stokes Raman scattering (CARS) and stimulated Raman scattering (SRS) involve the interaction of two laser beams, playing significant roles in cell and tissue imaging, as well as chemical analysis of biological samples [21,[49][50][51].…”