Layer-by-Layer Self-Assembled Ultrathin Multilayer Film of a Lanthanide Polyoxometalate and a Bipolar Ferrocenyl Derivative
The electrostatic layer-by-layer self-assembled multilayer films were successfully prepared from alternating deposition of K13[Nd(SiW9Mo2O39)2]·25H2O and a bipolar ferrocenyl derivative (Fc) on quartz, optical glass and indium-tin-oxide coated glass substrates. The films were investigated by UV−visible and X-ray photoelectron spectroscopies (XPS), and cyclic voltammetry. The UV−vis spectra demonstrated that the deposition of the films was uniform and reproducible. XPS revealed that the film was of chemical composition of [Nd(SiW9Mo2O39)2]13-:Fc = 1:6. The dependence of cyclic voltammograms of the film on the potential scan rates showed a redox couple with a formal potential Ef (Ef = (Epa+Epc)/2) of 0.36 V which is similar to that (0.31 V) for Fc aqueous solution, and the redox reaction for the film was surface confined.
Chunli BAI, Sishen XIE, Xing ZHU
Y.Q. Zhang et al., "Layer-by-Layer Self-Assembled Ultrathin Multilayer Film of a Lanthanide Polyoxometalate and a Bipolar Ferrocenyl Derivative", Solid State Phenomena, Vols. 121-123, pp. 449-452, 2007