One step cathodically electrodeposited [Tb2(BDC)3(H2O)4]n thin film as a luminescent probe for Cu2+ detection

A luminescent Ln-CP film of [Tb-2(BDC)(3)(H2O)(4)](n) (1) [BDC: p-Benzenedicarboxylate anion] is fabricated using electrodeposition method on FTO (fluorine-doped tin oxide glass). It is a one-step and highly effective electrochemical method at room temperature. The influence of reaction conditions on the thickness of film 1 was investigated. A smooth and adherent thin film 1 is obtained at the appropriate concentrations of Tb(NO3)(3) (0.01 M) and H2BDC (0.015 M) with 0.3 mA cm(-2) (0.050 M NH4NO3) for 20 minutes. The composition of the film was confirmed by X-ray diffraction. The sensing properties of the film have been studied. The results show that thin film 1 exhibits selective detection of Cu2+ in DMF solution. The luminescent intensity is inversely proportional to the concentration of Cu2+ ions and displays a linear region over the range of 1 x 10 (5) -1 x 10 (3) M. Furthermore, a probable quenching mechanism is discussed.