| Raman shift investigation of different concentrations of MWCNTs in TiO2/Ag/MWCNTs nanocomposites |
| Paper ID : 1038-UFGNSM-FULL |
| Authors: |
|
Marzieh Nadafan *1, Ammar Alattar2, Rasoul Malekfar3, zahra dehghani4 1Department of Physics, Shahid Rajaee Teacher Training University, Tehran, Lavizan, P. O. Box 16788-15811, I.R. Iran 2Genneral Directorate of Education in Kerbala, Kerbala, Iraq 3Atomic and Molecular Physics Group, Faculty of Basic Sciences, Tarbiat Modares University 4Department of Physics, University of Neyshabur, Neyshabur, P. O. Box 9319774400, I.R. Iran |
| Abstract: |
| Colloidal silver nanoparticles were prepared by Lee and Meisel method. Different loadings of Multi-Walled Carbon Nanotubes (MWCNTs) into TiO2/Ag matrix also were synthesized by sol-gel method. TiO2 nanoraticles in this nanocomposite is anatase phase. X-ray diffraction analysis (XRD) and Scanning Electron Microscopy, SEM, have been used for the structural analysis and investigating the surface morphology and measuring the size of the synthesized nanocomposites. The average size of colloidal silver nanoparticles were estimated about 17 nm by Dynamic Light Scattering (DLS). This is demonstrated by micro-Raman spectra collected from samples containing dispersed MWCNTs in the matrix. Furthermore, the recorded Raman spectra have shown that MWCNTs in the synthesized structures, make widening and displacement of the Raman peaks. According to the amount of shifting of the main bands of MWCNTs in the proposed matrix was calculated. A direct correlation of the G՛ (2672 cm-1) band frequency with the effective MWCNT wt% loadings in the nanocomposites is confirmed after exact evaluating experiments performed on TiO2/Ag-MWCNTs nanocomposites. All the Raman bands of MWCNTs have been observed to shift to higher wavenumbers upon debundling on account of less intertube interactions. According to the amount of shifting of the G՛ band, +40 cm-1 for 5 wt. % loading of MWCNTs, the compressive strain of MWCNTs in the proposed matrix was calculated. The calculated value is remarkably higher than the amount reported in similar works. |
| Keywords: |
| Raman spectroscopy, MWCNTs, Titania, Ag Nanoparticles |
| Status : Paper Accepted (Poster Presentation) |
