A photo-luminescent multilayer film based on Keggin-type polyoxometalate PMo 12O 3- 40 and transition metal complex tris(2,2-bipyridine) ruthenium [Ru(bpy) 3] 2+ was prepared by using layer-by-layer assembly(LBL). The formation of multilayer film was monitored by ultraviolet absorption spectra(UV). The absorption intensity of characteristic peaks increases with a four-layer cycle, indicating that the LBL assembly film grows linearly and reproducibly. The composition of the film was measured by X-ray photoelectron spectrum(XPS). The film exhibited photo-luminescence arising from π*-t 2g ligand-to-metal transition of Ru(bpy).
A novel method for controlled synthesis of crystalline molybdenum dioxides nanowhiskers (whisker-MoO2) by using moderate reductive and precursor ion under hydrothermal conditions is reported. The result shows that the as-obtained samples have a monoclinic structure, and the whisker-MoO2 is composed of nanowires with diameters of ca. 20 nm. Formation of whisker-MoO2 was through a typical precursor-reduction process, in which cetyltrimethylammonium bromide (CTAB) served as a cationic surfactant and acetone as a reductant. The electrochemical behavior of whisker-MoO2 was studied.
Yu Mei KONG Jun PENG Feng Shan SHEN Bao Xia DONG Li Ll
The conducting thin film of charge - transfer salt based upon polyoxometalate[VW 5 O 19 ] 3- and bis(ethyl - enedithio) - tetrathiafulvalene(BEDT - TTF or ET)was fabricated on the gold substrate by electrochemical approach.The sub - micronic grains uniformly covering the gold plate was evidenced by scanning electron microscope(SEM).The film of charge - transfer salt exhibits semiconducting behavior with a room - temperature conductivity4.8 × 10 -3 S·cm -1 .
