ZnO micro/nanostructures with various morphologies were grown via hydrothermal etching of Zn foil.Controlling the reaction temperature and time,rod-like,pencil-like,tube-like and flowerlike ZnO micro/nanostructures could be prepared directly on the Zn foil surface at temperatures 100-180℃ with excellent reproducibility.X-ray diffraction patterns indicated that these ZnO micro/nanostructures were hexagonal.Possible mechanisms for the variation of morphology are discussed.Moreover,photoluminescence spectra of the as-grown samples revealed that all of them consist of UV emission band at around 392 nm.
For the study of magnetic field-assisted assembly behavior,one-dimensional(1D)NiCo alloy nanostructures were solvothermally obtained at 180℃under an in situ magnetic field(the magnetic field as applied during the chemical reduction)and ex situ field(after the chemical reduction was finished).Microscopic morphology and magnetic properties differences were investigated using scanning electronic microscope(SEM)and vibrating sample magnetometer(VSM)for these products.Magnetic measurement results show that 1D ordered microstructures under in situ magnetic field possess higher saturation magnetization Ms, remnant magnetization Mr,coercivity Hc and reduced magnetization Mr/Ms than 1D ordered microstructures under ex situ field,and the four magnetic parameters of the two ordered microstructures are much higher than those randomly distributed alloy particles prepared in the absence of external magnetic field.
Using different-solution-concentration precursors with citric acid as chelating agent and polyvinyl alcohol as dispersing media, Dy3+ activated LaVO4 films were deposited on indium tin oxide (ITO) substrates. The scanning electronic microscope (SEM) showed that the compact and crack-free LaVO4:Dy3+ film could be obtained at a suitable solution concentration. The deposited films could absorb the ultra-violet light below 400 nm and were transparent in the visible and infrared region as evidenced by the transmission spectra, and the photolumines-cence spectra exhibited the characteristic emissions of Dy3+ peaking at 484 (blue) and 576 (yellow) nm due to the transitions of 4F9/2→6H15/2 and 4F9/2→6H13/2, respectively. The potential application of LaVO4:Dy3+ film in the dye-sensitized solar cell (DSSC) was also discussed.
