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As novel and promising fluorescent nanomaterials,carbon dots (CDs) are widely applied in sensing,bio-imaging and cellular labeling due to their excellent fluorescence,low toxicity,eco-friendliness and low-cost [1-5].They are considered as a potential alternative to traditional semiconducting quantum dots (SQDs) and the fabrication of CDs draws great attention in recent years [6-9].In here,a series of luminescent CDs were synthetized for sensing and bio-imaging.