Abstract
Recent advances in nanomaterials have been led by new synthetic methods that provide control over size, morphology and crystal quality of materials. The present study is tried to discuss the effect of ultrasonic waves on characteristics of ZnO quantum dots by study of UV absorption, photoluminescence spectroscopy, X ray diffraction patterns, transmission electron microscopy and growth stages of two samples prepared by sonochemical and conventional methods. The results demonstrated that the quantum dots synthesized under ultrasonic waves were of smaller size with more narrow size distribution. Also, improvement of their crystal quality was inferred from investigation of visible emission intensity. The use of ultrasonic waves caused the phase purity of nanocrystals obtained by complete conversion of precursors into ZnO. Further, the study of their growth stages indicated that the rapid nucleation and nucleation growth were followed by Ostwald ripening process which improve the crystal properties. The better crystal quality of ultrasonic prepared ZnO indicated the enhancement of its applicability to be used for optoelectronic applications.
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