Monolayer Assembly of Pyrene on Glass Plate Surface and Its Selective Sensing Performances to Organic Copper (II) Salts

A novel fluorescent sensing film was developed by covalently attaching pyrene moieties onto a glass plate surface via triethylenetetramine in a self-assembled monolayer manner. Fluorescence measurements demonstrated that the emission of the film could be quenched by organic copper (II) salts, including copper acetate, copper tartrate, and copper citrate, with high selectivity and sensitivity, and the response of the film to Cu(Ac)2 is fully reversible. In contrast, the presence of inorganic copper salts, such as Cu(NO3)2, CuSO4, and CuCl2, showed lower quenching efficiency. The sensing performance of the film to Cu(Ac)2 is slightly influenced by other divalent metal acetates, including Zn(Ac)2,Pb(Ac)2, Co(Ac)2,andNi(Ac)2.Furthermore,thequenchingof Cu(Ac)2 to the emission of the film is static in nature.