Effect of synthesis parameters of polyol technique on photoluminescence properties of ZnSe nanoparticles

The physical and chemical properties of nanomaterials significantly depend upon the morphological factors such as size and shape. In this work, the mono-dispersed ZnSe nanoparticles have been prepared by polyol method at different synthesis conditions. The XRD and Raman results showed that the reaction time is the key parameter in the formation of phase pure ZnSe nanoparticles. The ZnSe nanoparticles prepared for 3 h reaction time have Se impurity even at higher concentration of hydrazine whereas the samples prepared for 5 h and above have pure phase. The FESEM images of nanoparticles showed that all the samples have spherical morphology and HRTEM images evidently confirmed that, as reaction time increased the particles size increased gradually. Optical studies illustrate that the band gap value of the nanoparticles prepared at 10 h has lowest value and the photoluminescence intensity of these nanoparticles is decreased significantly. The possible reasons for this behavior have been detailed.