scholarly journals Quantum-chemical perspective of nanoscale Raman spectroscopy with the three-dimensional phonon confinement model

2017 ◽  
Vol 48 (6) ◽  
pp. 842-846 ◽  
Author(s):  
Vitaly I. Korepanov ◽  
Hiro-o Hamaguchi
Keyword(s):  
Raman Spectroscopy ◽  
Quantum Chemical ◽  
Three Dimensional ◽  
Phonon Confinement ◽  
Confinement Model

Modified phonon confinement model for Raman spectroscopy of nanostructured materials

2010 ◽  
Vol 82 (11) ◽  
Author(s):  
K. Roodenko ◽  
I. A. Goldthorpe ◽  
P. C. McIntyre ◽  
Y. J. Chabal
Keyword(s):  
Raman Spectroscopy ◽  
Nanostructured Materials ◽  
Phonon Confinement ◽  
Confinement Model

Raman Spectroscopy of Ge Nanocrystals Grown by Self-Organization Processes

1996 ◽  
Vol 452 ◽  
Author(s):  
A. Stella ◽  
C. E. Bottani ◽  
P. Cheyssac ◽  
R. Kofman ◽  
P. Milani ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Size Dependence ◽  
Self Organization ◽  
Phonon Confinement ◽  
Amorphous Substrate ◽  
Crystalline Nature ◽  
Size Dispersion ◽  
Ge Nanocrystals ◽  
Confinement Model

AbstractWe report Raman spectroscopy measurements on Ge nanocrystals with average radii ranging from about 65 Å down to 10 Å (with a size dispersion lower than 20 %).Ge has been deposited by UHV evaporation on an amorphous substrate, kept at such a temperature as to produce the Ge nanodroplets nucleation in the liquid phase.A nanocrystalline size dependence of the Raman spectra has been observed and explained in the framework of a phonon confinement model. We have observed the softening of the TO Raman peak predicted by the theory when the dimensions of the particles are decreased. Moreover the observed inhomogeneous broadening of the Raman lines has been correlated with the size distribution of the particles in the samples.Our results provide a characterization of Ge nanoparticles exhibiting a good crystalline nature, down to about 10 Å, and in conditions of substantial absence of perturbations of the environment.

scholarly journals Behavior of porous silicon crystallite size analized by Raman spectroscopy and phonon confinement model

2015 ◽  
Vol 34 (2) ◽  
pp. 75
Author(s):  
Miguel Angelo Do Amaral Junior ◽  
Neidenêi Gomes Ferreira ◽  
Antonio Fernando Beloto ◽  
Maurício Ribeiro Baldan
Keyword(s):  
Raman Spectroscopy ◽  
Porous Silicon ◽  
Crystallite Size ◽  
Phonon Confinement ◽  
Confinement Model

Raman scattering crystalline assessment of polycrystalline Cu2ZnSnS4 thin films for sustainable photovoltaic technologies: Phonon confinement model

2014 ◽  
Vol 70 ◽  
pp. 272-280 ◽  
Author(s):  
M. Dimitrievska ◽  
A. Fairbrother ◽  
A. Pérez-Rodríguez ◽  
E. Saucedo ◽  
V. Izquierdo-Roca
Keyword(s):  
Thin Films ◽  
Raman Scattering ◽  
Phonon Confinement ◽  
Photovoltaic Technologies ◽  
Confinement Model

scholarly journals Continuous Gradient Temperature Raman Spectroscopy of Fish Oils Provides Detailed Vibrational Analysis and Rapid, Nondestructive Graphical Product Authentication

Molecules ◽  
2018 ◽  
Vol 23 (12) ◽  
pp. 3293 ◽  
Author(s):  
C. Broadhurst ◽  
Walter Schmidt ◽  
Jianwei Qin ◽  
Kuanglin Chao ◽  
Moon Kim
Keyword(s):  
Raman Spectroscopy ◽  
Three Dimensional ◽  
Vibrational Analysis ◽  
Fish Oils ◽  
Scanning Calorimetry ◽  
Commercial Fish ◽  
Second Derivatives ◽  
Contour Plots ◽  
Solid Liquid ◽  
Continuous Temperature

Background: Gradient temperature Raman spectroscopy (GTRS) applies the continuous temperature gradients utilized in differential scanning calorimetry (DSC) to Raman spectroscopy, providing a new means for rapid high throughput material identification and quality control. Methods: Using 20 Mb three-dimensional data arrays with 0.2 °C increments and first/second derivatives allows complete assignment of solid, liquid and transition state vibrational modes. The entire set or any subset of the any of the contour plots, first derivatives or second derivatives can be utilized to create a graphical standard to quickly authenticate a given source. In addition, a temperature range can be specified that maximizes information content. Results: We compared GTRS and DSC data for five commercial fish oils that are excellent sources of docosahexaenoic acid (DHA; 22:6n-3) and eicosapentaenoic acid (EPA; 20:5n-3). Each product has a unique, distinctive response to the thermal gradient, which graphically and spectroscopically differentiates them. We also present detailed Raman data and full vibrational mode assignments for EPA and DHA. Conclusion: Complex lipids with a variety of fatty acids and isomers have three dimensional structures based mainly on how structurally similar sites pack. Any localized non-uniformity in packing results in discrete “fingerprint” molecular sites due to increased elasticity and decreased torsion.

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