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In order to obtain uniformly dispersed ？ non-contaminated and non-agglomerated GNPs ？ the agglomerated GNPs were dispersed by ultrasonic treatment technology and the main influencing factors？ the effects of ultrasonic power and ultrasonic time in the dispersion process for GNPs ？ were studied. Characterization, detection and analysis of the morphology, size and structure of ultrasonically processed GNPs were studied by field emission electron microscopy？ transmission electron microscopy, Fourier transform infrared spectroscopy, Xray photoelectrori spectroscopy, Raman spectroscopy and atomic force microscopy analysis. The results show that pro longing the ultrasonic time or increasing the ultrasonic power could significantly improve the dispersion effect of GNPs？ but correspondingly reduce the size of GNPs to a certain extent and generating a large number of edge defects. When the ultrasonic power or ultrasonic time was too large？ vacancy defects would even be generated. When the ultrasonic power was 960 W and the ultrasonic time was 4 h, the dispersion effect of GNPs was the best, and the degree of fragmentation was relatively low. [ABSTRACT FROM AUTHOR]

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