Preparation of Poly-Dopamine Coated Graphite Carbon Nitride Voltammetric Sensor and Its Detection of Cu2+.

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-C₃N₄/ITO) based on the combination of multifunctional polydopamine and graphite carbon nitride is prepared for the first time for Cu²⁺ 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 Cu²⁺ is 3.789 nmol•L⁻¹. This is lower than that of graphite carbon nitride sensor (W-g-C₃N₄/ITO), due to the interaction between Cu²⁺ and PDA. [ABSTRACT FROM AUTHOR]