Abstract: 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 filmcould 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 filmto Cu(Ac)2 is slightly influenced by other divalentmetal acetates, including Zn(Ac)2, Pb(Ac)2, Co(Ac)2, and Ni(Ac)2. Furthermore, the quenching of Cu(Ac)2 to the emission of the filmis static in nature.

Key words: Pyrene, Fluorescent sensing film, Organic copper salts, Single-layer chemistry