Detecting compressive strain by evaluation of Raman spectroscopy of the multiwall Carbon nanotubes/TiO2 nanocomposites

Document Type : Reasearch Paper


1 Department of Physics, Shahid Rajaee Teacher Training University, Tehran, Lavizan, P. O. Box 16788-15811, I. R. Iran.

2 Department of Physics, University of Mustansiriyah, Baghdad, IQ, Iraq.

3 Department of Physics, University of Neyshabur, Neyshabur, P. O. Box 9319774400, I. R. Iran.

4 Atomic and Molecular Physics Group, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, P. O. Box 14115-175, I. R. Iran.


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 TiO2. The f-MWCNTs-TiO2 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 2G-bands of f-MWCNTs were related to 20 wt. % f-MWCNTs in TiO2 nanoparticles. Moreover, an up-shift of 40 cm-1 was recorded for the MWCNTs (G’-band) for 5 wt. % f-MWCNTs. For 20 wt. % f-MWCNTs/TiO2 (G-band) nanocomposites, was determined by 4.7%. By increasing the amount of f-MWCNTs in f-MWCNs/TiO2 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 TiO2 nanoparticles. The interaction between f-MWCNTs and TiO2 nanoparticles identified by the Gruneisen parameter. Therefore, a mechanism generated for stress transfer at the interface between f-MWCNTs and TiO2 nanoparticles which is indicated in many significant increases obtained in the mechanical and acoustical properties.


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