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; accepted 23 December 2010 Abstract: SnO2 nano particles with various Pd-doping concentrations were prepared using a template-free hydrothermal method. The effects of Pd doping on the crystal... spectroscope respectively. It was observed that Pd-doping had little effect on the grain sizes of the obtained SnO2 nano particles during the hydrothermal route. During thermal annealing, Pd-doping......