Novel nanocomposites of PEO/PVDF loaded by different contents of SWCNTs were prepared. From UV-Vis spectra, the estimated values of absorption edge, absorption coefficient, energy of tail and extinction coefficient we...Novel nanocomposites of PEO/PVDF loaded by different contents of SWCNTs were prepared. From UV-Vis spectra, the estimated values of absorption edge, absorption coefficient, energy of tail and extinction coefficient were calculated. The exponential decay tail at low energy is due to the presence of localized states in the energy band gap. The shift of Raman spectra indicates the possibility of SWCNTs to be attached with OH group in the side chain of polymer molecules. The X-ray measurements indicate that the addition of SWCNTs is a rich amorphous region in polymeric matrices and complete complexation between PEO/PVDF blend and SWCNTs. The SEM images show smooth surface of PEO/PVDF and they become rough with single rod with a good distribution within surface region in polymeric matrices after loading SWCNTs. TEM images showed that SWCNTs were dispersed well in polymeric matrices. The broken ends of nanotubes were showing that the SWCNTs were broken apart rather than from at the fracture surface. The films show some defects like rags on the tube walls. There are some black regions in TEM images attributed to amorphous nature carbon. The prepared nanocomposites are very useful in technical application.展开更多
System of polyethylene oxide (PEO) and PEO incorporated with 2.5 and 5 wt% of cadmium sulphide (CdS) nanoparticles were synthesized by simple trend chemical techniques and casting method. Characterization and investig...System of polyethylene oxide (PEO) and PEO incorporated with 2.5 and 5 wt% of cadmium sulphide (CdS) nanoparticles were synthesized by simple trend chemical techniques and casting method. Characterization and investigation of the samples has been done by different techniques such as: X-ray, UV-visible, photoluminescence (PL) and Transmission Electron Microscope (TEM) techniques. The change of the structural has been interpreted in terms of the structural modifications of the PEO polymeric matrices. The physical properties of nanoparticles were found to relate the size. The crystallite sizes of cadmium sulphide crystals were estimated from the peaks of the X-ray diffraction (XRD) and TEM tools. The average particle size found by TEM is 44 nm. The absorption spectra showed absorption edge at 448 nm for all the samples. The particle size was estimated by theory and was found to be nearly the same as that obtained by TEM. The optical properties of the samples were estimated by photoluminescence and UV visible spectroscopy.展开更多
文摘Novel nanocomposites of PEO/PVDF loaded by different contents of SWCNTs were prepared. From UV-Vis spectra, the estimated values of absorption edge, absorption coefficient, energy of tail and extinction coefficient were calculated. The exponential decay tail at low energy is due to the presence of localized states in the energy band gap. The shift of Raman spectra indicates the possibility of SWCNTs to be attached with OH group in the side chain of polymer molecules. The X-ray measurements indicate that the addition of SWCNTs is a rich amorphous region in polymeric matrices and complete complexation between PEO/PVDF blend and SWCNTs. The SEM images show smooth surface of PEO/PVDF and they become rough with single rod with a good distribution within surface region in polymeric matrices after loading SWCNTs. TEM images showed that SWCNTs were dispersed well in polymeric matrices. The broken ends of nanotubes were showing that the SWCNTs were broken apart rather than from at the fracture surface. The films show some defects like rags on the tube walls. There are some black regions in TEM images attributed to amorphous nature carbon. The prepared nanocomposites are very useful in technical application.
文摘System of polyethylene oxide (PEO) and PEO incorporated with 2.5 and 5 wt% of cadmium sulphide (CdS) nanoparticles were synthesized by simple trend chemical techniques and casting method. Characterization and investigation of the samples has been done by different techniques such as: X-ray, UV-visible, photoluminescence (PL) and Transmission Electron Microscope (TEM) techniques. The change of the structural has been interpreted in terms of the structural modifications of the PEO polymeric matrices. The physical properties of nanoparticles were found to relate the size. The crystallite sizes of cadmium sulphide crystals were estimated from the peaks of the X-ray diffraction (XRD) and TEM tools. The average particle size found by TEM is 44 nm. The absorption spectra showed absorption edge at 448 nm for all the samples. The particle size was estimated by theory and was found to be nearly the same as that obtained by TEM. The optical properties of the samples were estimated by photoluminescence and UV visible spectroscopy.
