pH Effect on the Size of Graphene Quantum dot Synthesized by Using Pulse Laser Irradiation

In this study graphene oxide (GO) is synthesized by using Hummer’s method. Low dimension graphene quantum dot nanoparticles (GQDs) are synthesized using pulse laser irradiation. Fourier transform-infrared spectroscopy (FTIR), ultraviolet-visible (UV-Vis) spectroscopy and photoluminescence (PL) analysis are applied to study the GQDs characteristic. Scanning electron microscopy illustrates the morphologies of GQDs and RGQDs. The results show that the solution’s pH has an effect on the size and bandgap of GQD. We introduce a suitable method to construct GQDs with great bandgap control, indicating a bright horizon for investigating graphene’s potential applications in transparent electronics, transistors, sensors, and energy harvesters. The successful attainment is size control by changing pH of solution and low cost synthesis process.