Preparation and Characterization of CdTe Nanoparticles in Zirconia Films Prepared by the Sol Gel Method

摘要

Two methods for the synthesis of CdTe nanoparticles in zirconia sol-gel films are demonstrated. The nanoparticles were obtained by chemical reduction of Te(IV) using reducing agent (hydrazine) or tin chloride. Particle sizes ranging from 6 to 20 nm in diameter could be prepared by varying the experimental parameters. The sie and crystalline structure of the particles were characterized by optical absorption. X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. The film morphology was characterized by scanning force microscopy. The film obtained by SnCl_2 method is smooth and homogeneous. The dense structure of CdTe nanoparticles of a few nm in diameter is revealed. The films prepred with hydrazine are porous as a result of evolution of the decomposition gaseous products during the reduction. Advantages and disadvantages of the two methods are discussed.