The Kataura plot for single wall carbon nanotubes on top of crystalline quartz

Abstract

Abstract In this work, we have studied the radial breathing mode (RBM) resonance Raman spectra of single‐wall carbon nanotube serpentines. Each serpentine consists of a series of straight, parallel, and regularly spaced segments, connected by alternating U‐turns formed on top of crystalline miscut quartz. We compare our ω RBM and E ii values with the results in the literature and find a strong environmental effect related to the tube–substrate interaction. We establish experimentally the ${\omega} _{{\rm RBM}} \, = \,(227/d_{{\rm t}} )\sqrt {1 + (0.082\,\pm \,0.009)d_{{\rm t}}^{2} } $ relation between RBM frequency ( ω RBM ) and tube diameter ( d t ), with a 100 ± 30 meV downshift in the optical transition energies with respect to the E ii values measured for the standard “super‐growth” samples.