In order to construct new optical materials for biological and medical labelling,citric acid/ethylenediamine-derived carbon dots CA/EDA-2 were constructed through one-step hydrothermal reaction with citric acid as the carbon source,ethylenediamine as the surface passivation agent and heteroatom N donor.The surface functional groups,optical properties and conductivity of CA/EDA-2 were studied through the measurements of infrared spectrum,confocal imaging and conductivity.It was indicated that CA/EDA-2 were composed of hydroxyl,amino and carbonyl groups,the citric acid/ethylenediamine-derived carbon dots had stable fluorescence performance in the optical analysis and could target mitochondria in HUVEC cells confocal imaging,giving 0.90 as the Pearson's coefficient.Meanwhile,the conductivity of carbon dots CA/EDA-2 was sensitive to the environmental pH,exhibiting better conductivity in a weakly alkaline environment.When the pH value was 8.0,the peak conductivity value was 8.43 mS/cm.
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