Structural characterization of carbon nanotubes via the vibrational density of states
arXiv:1703.03758 · doi:10.1016/j.carbon.2017.03.030
Abstract
The electrical and chemical properties of carbon nanotubes vary significantly with different chirality and diameter, making the experimental determination of these structural properties important. Here, we show that the vibrational density of states (VDOS) contains information on the structure of carbon nanotubes, particularly at low frequencies. We show that the diameter and chirality of the nanotubes can be determined from the characteristic low frequency and modes in the VDOS. For zigzag nanotubes, the peak splits into two peaks giving rise to another low energy peak. The significant changes in the frequencies and relative intensities of these peaks open up a route to distinguish among structurally different nanotubes. A close study of different orientations of Stone-Wales defects with varying defect density reveals that different structural defects also leave distinct fingerprints in the VDOS, particularly in the and modes. With our results, more structural information can be obtained from experiments which can directly measure the VDOS, such as inelastic electron and inelastic neutron spectroscopy.
arXiv comment5 Figures, Accepted for publication in Carbon
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