SYNTHESIS AND CHARACTERIZATION OF LARGE-SCALE HIERARCHICAL CdS MICROFLOWERS

The synthesis of three-dimensional semiconductor superstructures with specific size and shape is a crucial issue due to their size-and shape-dependent properties and significant applications. Using polyvinylpyrrolidone (PVP) as a capping agent, we employed a facile hydrothermal process to synthesize large-scale hierarchical CdS microflowers. X-ray diffraction, X-ray photoelectron spectroscopy and field-emission scanning electron microscopy were used to characterize the as-prepared products. The contrast experiment indicated that PVP played a great role on formation of CdS microflowers. By varying the reaction time, the morphologies of CdS crystals can be easily controlled. The absorption spectra of CdS crystal at the different growth stage were also examined.