Abstract: La doped SnO 2 morph-genetic ceramic was prepared by doping rare-earth oxide using modified ramie fibers treated with alkali as biology templates . The microstructure and phase composition of prepared materials were discussed , and their specific surface area , pore size distribution and gas-sensitive property were tested .The results show that the rare earth oxide can be benefit to retain the growth of SnO2 grains and improve the C 2 H5 OH,CH3 COCH3 and H2 gas sensitive of SnO 2 gas sensitive material .

Key words: template modification;rare earth doping;SnO2;gas sensitivity