Abstract
Abstract Crystalline graphite microparticles are good source for fabricating carbon based nanodots. In spite of their tremendous applications in biomedical research, the stability and non-toxicity of the product material has not been addressed. In this paper, we show that by nanosecond laser irradiation of graphitic microparticles in water, a highly stable water suspension of luminescent carbon quantum dots of high purity is generated. The sizes of the quantum dots are tuned in the range from 5 nm to 15 nm by varying the laser irradiation time. Quantum confinement is strongly evident from the optical absorption and photoluminescence spectra. Interestingly, we observed the quantum dots are self-functionalized during the fragmentation process. FTIR spectrum shows the presence of unsaturated CO bond at the surface of the quantum dots resulting in the development of similar charges. Due to the repulsive Coulombic force, these quantum dots remain stable for a very long period of time avoiding the use of any unwanted surface ligands or surfactants.
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