Polymeric surfaces Rhodamine

Zhu et al. proposed more complicated biosensor construction for selective binding of rhodamine B and 1-aminopyrene [119]. To do this, first GO is electrochemically reduced on the surface of the GCE and then iV-acetylaniline is polymerized on top of it. After this, -CD was covalently attached to the composite surface by electrooxidation. This sensor was used for voltammetric determination of 1-aminopyrene, an electrochemically active polycyclic aromatic hydrocarbon deleterious for living organisms. The authors show that -CD binds rhodamine B selectively, but in the presence of 1-aminopyrene, the rhodamine B molecules are displaced by 1-aminopyrene. This displacement results in a decreased oxidation peak current of rhodamine B and the appearance of an oxidation peak current for 1-aminopyrene. The current is linearly dependent on the 1-aminopyrene concentration between 10-260 nM. 

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