Synthesis And Properties Of A_x(BO₄)_y Nanostructure Materials

Our paper used hydrothermal method, chemical precipitation method and solution methods to synthesize the following five nanostructure materials. The products obtained were characterized by XRD, TEM, HRTEM, SEM, UV, PL and FT-IR, respectively.1. CeCl3·7H2O and K6V10O28·9H2O were used as reactants, CeVO4 nanocrystals were prepared by a hydrothermal method. The results show that when the pH is 9, and the temperature is 140℃, the products obtained were hexagonal nanoplate. Meanwhile, when the emission wavelength is 423 nm, it was found that CeVO4 nanocrystals has fluorescence. Besides, the glass surface was treated by using a ethanol solution of CeVO4 nanocrystals, the CA value of the glass surface is 151.4°.2. SmCl3·XH2O and K6V10O28·9H2O were used as reactants, and EDTA was used as surfactant. SmVO4 nanocrystals were synthesized by a hydrothermal method. The results show that when the pH is 9.7, and the temperature is 180℃, the products obtained were chrysanthemum-shaped nanocrystals. Besides, the glass surface was treated by using SmVO4 nanocrystals and [(C2H5O)3Si(CH2)2C8F17], the CA value of the glass surface is 169.3°.3. Zn(CH3COO)2·2H2O and K6V10O28·9H2O were used as reactants, a-Zn3(VO4)2 nanocrystals were synthesized by a chemical precipitation method without using any surfactant. The results show that when the molar ratio of Zn and V is 3:2, the pH is 11, and the calcination temperature is 400℃, the products obtained were layered flower-shaped nanocrystals. Meanwhile, when the emission wavelength is 422 nm, it was found thatα-Zn3(VO4)2 nanocrystals has fluorescence. Besides, the glass surface was treated by usingα-Zn3(VO4)2 nanocrystals and [(C2H5O)3Si(CH2)2C8F17], the CA value of the glass surface is 160.9°.4. CdCl2·2.5H2O and Na2MoO4·2H2O were used as reactants, Cd(MoO4) nanocrystals were prepared by a hydrothermal method. The results show that when the temperature is 180℃, and the reaction time is 24 h, the products obtained were polyhedral-shaped nanocrystals. Besides, the glass surface was treated by using Cd(MoO4) nanocrystals and [(C2H5O)3Si(CH2)2C8F17], the CA value of the glass surface is 154.7°.5. Na2WO4·2H2O and Pb(NO3)2 were used as reactants, PbWO4 nanocrystals with different morphology were synthesized by a solution method. The results show that the products synthesized under the different pH values have different morphology. Meanwhile, when the excitation wavelength is 300 nm, it was found that PbWO4 nanocrystals has fluorescence, and the emission center is situated at 484 nm. Besides, the glass surface was treated by using PbWO4 nanocrystals and [(C2H5O)3Si(CH2)2C8F17], the CA value of the glass surface is 165.8°.