Isnaeni, I. Rahmawati, R. Intan, M. Zakaria
Carbon dots are new type of fluorescent nanoparticle that can be synthesis easily from natural sources. We have synthesized carbon dots from ginger and galangal herbs using microwave technique and studied their optical properties. We synthesized colloidal carbon dots in water solvent by varying microwave processing time. UV-Vis absorbance, photoluminescence, time-resolved photoluminescence, and transmission electron microscope were utilized to study properties of carbon dots. We found that microwave processing time significantly affect optical properties of synthesized carbon dots. UV-Vis absorbance spectra and time-resolved photoluminescence results show that luminescent of carbon dots is dominated by recombination process from n-π∗ surface energy level. With further development, these carbon dots are potential for several applications. © Published under licence by IOP Publishing Ltd.
Research Center for Physics, Indonesian Institute of Sciences, Riset Rd. Building 442, Puspiptek, South Tangerang, Banten, 15314, Indonesia; Department of Physics, State University of Semarang, Sekaran Street, Gunung Pati, Semarang, Central Java, 50229, Indonesia
