INFLUENCE OF SURFACTANTS ON THE SYNTHESIS OF SnO_2 NANOPARTICLES AND NANORODS

摘要

SnO_2 nanocrystaline powders with an average diameter of 12-60 nm have been successfully synthesized using different surfactants and a surface modifier, cetyltrimethylammoniumbromide (CTAB), Polyethylene glycol (PEG) and citric acid respectively at different pH via hydrothermal method. The SnO_2 nanopowders were characterized using X-Ray diffractometer (XRD), UV-absorption spectroscopy, Scanning electron micrograph (SEM). XRD pattern reveals that a high crystalline rutile SnO_2 nanoparticles have been synthesized. Significant morphological changes were observed in SEM due to different surfactant, surface modifier and pH. The absorption edges exhibited a blue shift, which can be ascribed to the quantum confinement effect. The probable growth mechanisms of SnO_2 are discussed.