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The importance of the interaction between heavy metals and sensors for detection has been repeatedly introduced. In this paper, a voltammetric sensor (PDA@W-g-C 3 N 4 /ITO) based on the combination of multifunctional polydopamine and graphite carbon nitride is prepared for the first time for Cu 2+  detection. On the basis of studying the influence of the experimental parameters such as buffer solution, pH, enrichment potential, and enrichment time on the peak current of copper ion dissolution, the detection limit for Cu 2+  is 3.789 nmol• L−1 . This is lower than that of graphite carbon nitride sensor (W-g-C 3 N 4 /ITO), due to the interaction between Cu 2+  and PDA.

Preparation of Poly-Dopamine Coated Graphite Carbon Nitride Voltammetric Sensor and Its Detection of Cu 2+