摘要
以无机试剂为起始原料，加入少量溶胶形成助剂，采用溶胶－凝胶法合成纳米级ＳｎＯ２。以ＴＧ－ＤＴＡ热分析、ＩＲ、ＸＲＤ及ＴＥＭ等分析手段对热处理过程中纳米级ＳｎＯ２晶粒进行了研究，并测试了纳米级ＳｎＯ２的阻温特性以及掺入Ｒｕ、Ｒｈ催化剂后的气敏特性。应用相变理论计算得热处理温度在５００～６００°Ｃ时其晶核生长活化能为２６．５５ｋＪ／ｍｏｌ。纳米级ＳｎＯ２具有其特征的阻温特性，这与其表面吸附氧增多有关。在纳米级ＳｎＯ２中掺入Ｒｕ，能提高ＳｎＯ２对Ｃ４Ｈ１０、汽油的选择性检测，而在掺入Ｒｈ时，由于对ＣＯ、ＣＨ４、Ｈ２等气体灵敏度的普遍提高。
Nanometersized SnO2 particles were prespared by a solgel method using inorganic salt as a precursor material. It's crystallization was investigated by means of TGDTA, IR absorption spectra, Xray diffractometry and TEM. It's resistivity change and gas sensitivity varied with temperature were measured in various reducing gas. The results indicate that wellcrystallized nanosized SnO2 with size about 15nm can be obtained at annealing temperature 600℃. The activation energy for the growth of nanoSnO2 was calculated to be 26.55kJ/mol when the annealing temperature was higher than 500℃. The measurements also show that there is a peculiar resistance change varied with temperature for nanoSnO2. It has relevance to the increase of oxygen adsorbed on surface. The selective detectivities to C4H10 and petrol can be increased when ruthenium ion was doped in nanoSnO2 as a catalyst and so do the gas sensitivity to CO, CH4, H2 etc. when rhodium ion was doped in. The detection of the several reducing gas can be realized when the temperature ranged 260℃～400℃.
出处
《华东理工大学学报（自然科学版）》
CAS
CSCD
北大核心
1998年第4期431-435,共5页
Journal of East China University of Science and Technology
基金
上海市高等学校科技发展基金
关键词
纳米级
氧化锡
气敏特性
溶胶-凝胶法
solgel
nanometersized
tin oxide
gas sensitive property
