Quantitative Raman Spectroscopes Of C-C Bond Relaxation Dynamics In Carbon Allotropies

&arbon material is the one that has significant meaning in toda’s scientificresearch.With the rapid development of scientific research, the new structure of thecarbon allotropes are discovered, studied and applied continuously, for instance,fullerenes(C60), carbon nanotubes(CNT), carbon nanobuds(CNBs) andsingle/multilayer graphene. These carbon allotropes peculiar physical performanceattracted a tremendous amount of scientific work. The surprising is that almost all ofthe Raman spectrum of the carbon allotropes are only a few significant peaks. Thesespectral peak contains a lot of informations about atomic and electronic structure ofcarbon materials in the shape size, the amplitude spectral peak intensity, and the peakposition, even though these spectrums looks like be simple. These informations arethe important basis and dependence of the property study of various carbon materialdevices. The Raman spectra of some typical structures of carbon allotropes areanalysed and calculated based on the bond order–length–strength (BOLS) correlationtheory and the local bond average (LBA) approach. This work will provide theoreticalfoundation and direction for the design and application of carbon electron deviceespecially the device of nanoscale. This major content of the paper are as following:(1) Introduce the BOLS theory and LBA approach.)rom the chemical bond’sformation, fracture, relaxation and vibration, an function relation between the atomicbonds parameters and mechanics, thermology and size are set up.(2) C－allotropes pressure effect of Raman spectra has been studied. Atomisticorigin of the mechanically stiffened of C－allotropes Raman spectra in unified model.At the same time, quantitate the information of the bond length, bond energy, bindingenergy density, and the compressibility of the C－C bond in each phase.(3) C－allotropes temperature effect of Raman spectra has been studied. Atomisticorigin of the thermally softened of carbon allotropes Raman optical phonons inuniform modeling. At the same time, quantitative the information of the modecohesive energy and Debye temperature.(4) We have formulated the number-of-layer resolved Raman shifts of graphene. Itis found that the primary D mode and the secondary2D mode are dominated by theinteraction between a specific atom and its nearest neighbors while the G mode by thedimer interaction, and therefore red shift happens to the D/2D phonons and blue shiftto the G mode upon the number-of-layer is reduced. We obtain the relationship between the layer-graphene and effective coordination number.(5) The strain effect of monolayer graphene Raman spectra has been studied. Theelongation and weakening of the C－C bond originates the phonon softening and themismatch between the uniaxial strain and the C3vbond geometry results in the phononband splitting.Above all, Raman phonon relaxation dynamics in carbon allotropes includinggraphene, carbon nanotube, C60, carbon nanobud, graphite, and diamond has beenstudied in terms of the bond order-length-strength (BOLS) correlation and the theoryof BOLS theory and LBA approach. Reveals the physical origin, Established auniform theoretical model, Quantify the C－allotropes important parameters andsystematically studied the relaxation process of the C－C bonds.