Cds Nanoparticles, Nanorods Assembly Hierarchical Structure Of The Controllable Synthesis And Photocatalytic Properties

Flowerlike nanoarchitectures assembled from CdS nanoflakes and six heavy symmetrical CdS nanoarchitectures have been synthesized by a very simple hydrothermal route. The morphologies, crystal structures of these products were characterized by scanning electron microscopy, X-ray diffraction, transmission electron microscopy. The processes of growth of these nanostructures were studied, and the possible growth mechanisms were proposed. The optical properties of flowerlike nanoarchitectures assembled from CdS nanoflakes and six heavy symmetrical CdS nanoarchitectures have been investigated。(1) Synthesis and enhanced photocatalytic activity of monodisperse flowerlike nanoarchitectures assembled from CdS nanoflakes:Monodisperse flowerlike nanoarchitectures assembled from CdS nanoflakes with the diameters of0.84-0.86μm were synthesized by a hydrothermal reaction of CdCl2·2.5H2O with thiocarbamide, polyvinylpyrrolidone and H2O at180℃for6.0h. The constituent CdS nanoflakes have perfect hexagonal shape with a side length of0.37-0.38μm and a thickness of0.06-0.07μm. Sphere like particles assembled from CdS nanocrystals formed firstly evolved into flowerlike architectures assembled from nanoflakes via an oriented attachment process due to the selective adsorption of PVP on (001) surface of CdS with the wurtzite structure. The as-obtained CdS flowerlike nanoarchitectures show higher photocatalytic activity than commercial CdS powders for degradation of malachite green.(2) Synthesis and photocatalytic activity of CdS nanoarchitectures:CdS nanoarchitectures assembled from CdS nanorods were synthesized by a hydrothermal reaction of CdCl2·2.5H2O with thiocarbamide, CH3COOH, CH3COONa and H2O at200℃for6h. In the presence of CH3COOH and CH3COONa, after the nucleation, the CdS monomers grew into CdS flowerlike nanostructures assembled from nanorods. The nanorods of flowerlike nanostructures evolved into CdS nanoarchitectures with reaction time. When the reaction time is6h, the CdS flowerlike nanostructures break up into individual nanoarchitectures. The as-obtained CdS nanoarchitectures show higher photocatalytic activity than flowerlike nanoarchitectures and commercial CdS powders for degradation of malachite green.