Synthesis of carbon dots from watermelon peels and activated charcoal / Nur Hanani Salleh @ Ariffin

Carbon has been extensively applied in the development of nanotechnology recently owing to their abundant sources in nature. Carbon dots (CDs) is a carbon-based fluorescence nanoparticles of 2-10 nm in diameter and has been proposed as a new type of imaging reagent. Methods involved are carbonization of carbon from watermelon peels, sonication, centrifugation, 12 hours reflux, freeze dry and evaporation. The samples obtained from the methods were analyzed using UV-visible spectroscopy, fluorescence spectroscopy, UV lamp and pH strips. These entire tests were done to indicate the presence of CDs synthesized from the watermelon peels and activated charcoal. Sample from the watermelon peels showed blue fluorescence color whereas sample from activated charcoal showed green fluorescence color when viewed under UV lamp.