| Summary: | Few-layer graphene sheets were synthesis using liquid phase exfoliation (LPE) with ultrasonic-assisted. The pristine graphite is directly exfoliated in deionized water with small addition of ammonia (NH3) solution. In this study, we will investigate the relationship between concentration of NH3 solution corresponds to the graphene yield. The concentration of the NH3 solution varies from 18% to 26%. NH3 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 X-Ray Diffraction (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 NH3 concentration. This optimization results in a few layers of graphene sheets may be used in the fields of nanoelectronics and optoelectronics application. © 2022 Trans Tech Publications Ltd, Switzerland.
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