英语翻译Raman spectroscopy is an inelastic photon scattering spe

英语翻译
Raman spectroscopy is an inelastic photon scattering spectrum,which reflects unique information concerning the vibration and electronic properties of materials.As for various types of carbon-based materials,even though these materials possess similar graphene-sheet-like microscopic structures,any minor differences existing in the structure or in the dimension could still be identified by means of Raman spectroscopy based on the different electronic properties and phonon vibrations of the materials.Raman spectroscopy,with its high sensitivity to shift-induced symmetry,its non-destructive quality,as well as its ability to be used in microanalytical studies,has become a powerful technique to identify the microscopic structure of nanoscale carbonbased materials .Recently,accompanying the deep exploration of the various properties of carbon nanotubes (CNTs),Raman spectroscopy has been widely used to investigate the structure and physical properties of CNTs.For instance,Raman spectroscopy has been employed successfully to determine the diameter and distribution of nanotubes [2–4],their metallic or semiconducting nature ,and their orientation .Furthermore,Raman spectra can also be used to quantify the strain or stress that the nanotubes experience under external loads .Because the shifts of specific Raman bands associated with the nanotubes result from variations of the C＝C bond length,it is possible to directlyevaluate the interactions between the nanotubes and polymers using Raman spectra under dynamic conditions.Here,on the basis of an overview of Raman spectroscopic studies of CNTs,recent progress of Raman measurements in CNTbased composites are reviewed.