Preparation and characterization of CdTe nanoparticles in zirconia films prepared by the sol gel method

Two methods for the synthesis of CdTe nanoparticles in zirconia sol-gel fil ms 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 experi metal parameters. The size and crystalline structure of the particles were characterized by optical absorption, X-ray diffraction, transmission electr on microscopy and X-ray photoelectron spectroscopy. The film morphology was characterized by scanning force microscopy. The film obtained by SnCl2 method is smooth and homogeneous. The dense stru cture of CdTe nanoparticles of a few nm in diameter is revealed. The films prepared with hydrazine are porous as a result of evolution of the decompos ition gaseous products during the reduction. Advantages and disadvantages of the two methods are discussed.