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CQDs were first discovered in 2004 accidently during the purification of single walled carbon nanotubes.. Much progress has been achieved in the synthesis properties and application of CQDs. As a new class of fluorescent Carbon nanomaterial CQDs processes. The properties of high solubility good. Conductivity, low toxicity, environmental friendliness, simple synthetic route are well as comparable optical properties to quantum dots. Carbon quantum dots have been extensively investigated especially due to their strong and tunable fluorescence emission properties.