Detecting compressive strain by evaluation of Raman spectroscopy of the multiwall Carbon nanotubes/TiO۲ nanocomposites

Functionalized Multi-walled carbon nanotubes (f-MWCNTs) which are modified using nitric acid and sulfuric acid were evaluated to synthesize a uniform nanocomposite via application of TiO۲. The f-MWCNTs-TiO۲ nanocomposites have been produced via using the chemical simple two-step method. To characterize the structural analysis, scanning electron microscopy (SEM) imaging, ultraviolet-visible (UV-Vis) spectroscopy, and Raman spectroscopy were utilized. The maximum shift of D, G, and ۲G-bands of f-MWCNTs were related to ۲۰ wt. % f-MWCNTs in TiO۲ nanoparticles. Moreover, an up-shift of ۴۰ cm-۱ was recorded for the MWCNTs (G’-band) for ۵ wt. % f-MWCNTs. For ۲۰ wt. % f-MWCNTs/TiO۲ (G-band) nanocomposites, was determined by ۴.۷%. By increasing the amount of f-MWCNTs in f-MWCNs/TiO۲ nanocomposite, the compressive strain was increased. Among the four bonds, the G’-band behaved differently against increasing f-MWCNTs. The shifting frequency of G-band indicates the strong interaction between f-MWCNTs and TiO۲ nanoparticles. The interaction between f-MWCNTs and TiO۲ nanoparticles identified by the Gruneisen parameter. Therefore, a mechanism generated for stress transfer at the interface between f-MWCNTs and TiO۲ nanoparticles which is indicated in many significant increases obtained in the mechanical and acoustical properties.

کلیدواژه ها:

Compressive Strain ، Multiwalled carbon nanotubes ، nanocomposites ، Raman spectroscopy ، Titanium dioxide