Nanometer-sized SnO_(2) particles were prepared by a sol-gel method using inorganic salt as a precursor material. Its crystallization was investigated by means of TG-DTA,IR absorption spectra, X-ray diffractometry and...Nanometer-sized SnO_(2) particles were prepared by a sol-gel method using inorganic salt as a precursor material. Its crystallization was investigated by means of TG-DTA,IR absorption spectra, X-ray diffractometry and TEM as well as its resistivity change and the gas sensitivity varied with temperature were measured in various reducing gas. The results indicate that well-crystallized nano-sized SnO_(2)with size around 15nm can be obtained at annealing temperature 600℃. The activation energy for the growth of nano-SnO_(2) was calculated to be 26.55kJ.mol^(-1) when the annealing temperature was higher than 500℃. The measurements also show that there is a peculiar resistance change varied with temperature for nano SnO_(2).It has relevance to the increase in surface adsorbed oxygen. The selective detectivities to C_(4)H_(10) and petrol can be increased when ruthenium ion was doped in nano SnO_(2)as a catalyst and so do the gas sensitivity to CO,CH_(4),H_(2) etc. when rhodium ion was doped in.The detection to the several reducing gas can be realized when the temperature ranged from 260℃ to 400℃.展开更多
文摘Nanometer-sized SnO_(2) particles were prepared by a sol-gel method using inorganic salt as a precursor material. Its crystallization was investigated by means of TG-DTA,IR absorption spectra, X-ray diffractometry and TEM as well as its resistivity change and the gas sensitivity varied with temperature were measured in various reducing gas. The results indicate that well-crystallized nano-sized SnO_(2)with size around 15nm can be obtained at annealing temperature 600℃. The activation energy for the growth of nano-SnO_(2) was calculated to be 26.55kJ.mol^(-1) when the annealing temperature was higher than 500℃. The measurements also show that there is a peculiar resistance change varied with temperature for nano SnO_(2).It has relevance to the increase in surface adsorbed oxygen. The selective detectivities to C_(4)H_(10) and petrol can be increased when ruthenium ion was doped in nano SnO_(2)as a catalyst and so do the gas sensitivity to CO,CH_(4),H_(2) etc. when rhodium ion was doped in.The detection to the several reducing gas can be realized when the temperature ranged from 260℃ to 400℃.
