Ultrasonic-Assisted Exfoliation of Pristine Graphite into few Layers of Graphene Sheets Using NH<sub>3</sub> as Intercalation Agent

Few-layer graphene sheets were synthesis using LPE with ultrasonic-assisted. The pristine graphite is directly exfoliated in deionized water with small addition of NH 3 solution. In this study, we will investigate the relationship between concentration of NH 3 solution corresponds to the graphene yield. The concentration of the NH 3 solution varies from 18% to 26%. NH 3 solution plays an important role as a medium to peel of graphite in the exfoliation process to form few-layer graphene sheets. The structural properties of the few-layer graphene sheets were examined using XRD, Raman Analysis, Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscope (SEM) followed by UV-Vis Spectroscopy for its optical properties. The finest of few-layer graphene sheets was produced at 26% of NH 3 concentration. This optimization results in a few layers of graphene sheets that may be used in the fields of nanoelectronics and optoelectronics.