Abstract
ZnTe nanoparticles (NPs) were synthesized using hydrothermal method and then were dispersed in poly(vinyl-chloride) (PVC) to prepare hybrid PVC/ZnTe nanocomposite thin films which were deposited on glass substrates by the dip coating technique in the aim to be used in photoelectronic applications. Structural, optical and electrical properties of films were investigated by different techniques. XRD analysis revealed that synthesized ZnTe NPs have a cubic structure and a nanoscale size,while pure PVC films have a weak degree of crystallinity and exhibit a broad diffraction peak at low angles. The PVC/ZnTe nanocomposite thin films display an intense diffraction peak corresponding to the plane (220) which indicates a preferred orientation of ZnTe nanocystallites along crystallographic axis [220]. This texture was also showed by the atomic force microscopy micrographs.The analysis by FT-IR and Raman vibrational spectroscopies confirmed the incorporation of ZnTe NPs in the PVC matrix.The ZnTe/PVC nanocomposites thin films have an optical transparency over 80% in the visible range and an optical gap close to 4.07 eV. Discrepancies with respect to the gap of pure PVC (red shift) and bulk ZnTe (blue shift) are due to the effect of the interaction between the ZnTe NPs and the PVC matrixand also to the nanometric size of the ZnTe NPs. Photoluminescence (PL) spectra showed an enhanced blue emission at 466 nm,a green emissionat 522 nm and a strong red emission at 686 nm. Thus the incorporation of oriented ZnTe NPs induced a new optical behavior of the PVC polymer matrix. Electrical measurements indicate a decrease of electrical resistivity of PVC/ZnTe nanocompositesas ZnTe NPs concentration increases.
Highlights
CdSe [3], TiO2 [4] and ZnO [5], this trend is driven by the fact that polymers are technologically advantageous owing to the ease and flexibility of devices fabrication process
The crystallite size values related to the diffraction planes are reported in Table 1, it can be seen that all the Zinc telluride (ZnTe) crystallites have a nanometric size which is in the range 20.83 – 57.19 nm
4 Conclusion The performed work is focuced on the synthesis of the ZnTe semiconductor NPs by the hydrothermal method and the fabrication of PVC/ZnTe nanocomposite thin films deposited by Dip-Coating technique
Summary
3.1 XRD analysis The figure 1 shows the XRD pattern of assynthesized ZnTe NPss. The spectrum depicts a polycrystalline structure and the analyze of angular positions and intensities of diffraction peaks (Table 1) shows that all peaks are related to the cubic phase of ZnTe (space group F43m) according to the JCPDS. The appearing of the phosphorescence band at 525 nm is owing to the formation of triplet excimers which are related to the presence of excimers [49] as the high efficiency of energy transfer in the solid state of polymers, makes that the emitting species can be not the chromophores that were originally excited [45] The intensity of this band (525 nm) is relatively weak butalso increases with the concentration of ZnTe NPs. the intensity of the strong luminescent band at 686 nm which is owin to the oxygen defects in the ZnTe NPs is affected by the rate of ZnTe NPs and by the energy transfer process. the optical absorption band at 570 nm is consistent with the photoluminescence characteristics, and is assigned to oxygen defects in ZnTe NPs [38]. An optimal concentration of ZnTe Nps would favormore importante intensity of the PVC/ZnTe nanocomposite luminescence
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