Topic
Raman spectroscopy
About: Raman spectroscopy is a research topic. Over the lifetime, 122605 publications have been published within this topic receiving 2891083 citations. The topic is also known as: Raman Spectrum Analysis & spectrum Analysis, Raman.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, Raman scattering measurements were performed on polycrystalline silicon films prepared in a hydrogen plasma at temperatures between 70 and 400°C. The spectra showed several features which were correlated with X-ray diffraction measurements and assigned to crystalline and amorphous-like components.
283 citations
TL;DR: In this paper, the thermal conductivities of monolayer (1L) and bilayer (2L) WS2 grown by chemical vapor deposition (CVD), which are determined by use of temperature and excitation dependences of E� 2g� 1 Skydragon and A1g Raman modes, were extracted.
Abstract: We report the thermal conductivities of monolayer (1L) and bilayer (2L) WS2 grown by chemical vapor deposition (CVD), which are determined by use of temperature and excitation dependences of E
2g
1
and A1g Raman modes. The first-order temperature coefficients of E
2g
1
and A1g modes in both supported and suspended WS2 layers were extracted. The frequency shift of the A1g mode with temperature is larger than that of the E
2g
1
mode for 1L-WS2, which is attributed to stronger electron-phonon coupling for the A1g mode than that for the E
2g
1
mode. Moreover, by use of the shift of the phonon mode induced by laser heating, the thermal conductivities at room temperature were estimated to be 32 and 53 W/(m·K) for 1L- and 2L-WS2, respectively. Our results provide fundamental information about the thermal properties of WS2 layers, which is crucial for developing applications of atomically-thin WS2 devices.
283 citations
TL;DR: In this paper, a density functional theory approach was applied to the Raman and surface-enhanced Raman spectra (SERS) of crystal violet, and the resulting optimized structure is of point symmetry D3, which provides an excellent match with the observed normal Raman spectrum.
Abstract: Applying the method of density functional theory calculations, we examine the Raman and surface-enhanced Raman spectra (SERS) of crystal violet. The resulting optimized structure is of point symmetry D3, and the calculated Raman spectrum provides an excellent match with the observed normal Raman spectrum. This provides a reliable assignment of the symmetry and normal modes of the observed spectrum, which consists of bands assigned to modes of either a1 or e symmetry. The e modes are not split, showing that D3 symmetry remains, even on the surface. The SERS spectra, both normal and single-molecule, are dominated by the nontotally symmetric e vibrations, which are preferentially enhanced in accord with the Herzberg−Teller-surface selection rules. The mechanism involves intensity borrowing through vibronic coupling between a charge-transfer state and the lowest-lying π → π* transition. A quantitative measure of the degree of charge transfer is obtained by analyzing the potential dependence of SERS intensitie...
283 citations
TL;DR: In this paper, the pyrolyzed fibers were characterized using Raman microspectrometry and the graphite domain size was found to be between 1.5 and 2.6 µm.
283 citations
282 citations