【摘要】 研究了甲醛在TiO2-Y2O3(质量比为3∶1)粉体表面催化发光行为,发现基于这种催化剂的气体传感器对甲醛的检测具有高灵敏度和较强的选择性。在波长490 nm处进行定量分析,催化发光强度与甲醛浓度在一定范围内呈良好的线性关系,其线性范围为0.08~40 mL/m3(r=0.9991,n=6);检出限为0.03 mL/m3(S/N=3)。外来物质如环己烷、正己烷、三氯甲烷、苯、乙醇、甲醇、乙醛、氨、水蒸气等与甲醛共存时,除了乙醇和氨分别引起干扰外,水蒸气与其它气体不干扰测定。该传感器工作时间可达80 h以上,是一种长寿命的、性能稳定的气体传感器,并成功地实现了对甲醛的实时在线检测。更多还原

【Abstract】 Cataluminescence（CTL） behavior of formaldehyde upon catalytic oxidation on TiO₂-Y₂O₃ powder（the ratio of mass was 3∶1） was studied.The results showed that the sensor using this catalytic oxidation could be used for high sensitive and selective detection of formaldehyde in gas.Quantitative analysis was（performed） at the wavelength of 490 nm.Under the optimized conditions,the linear range of CTL intensity（versus） concentration of formaldehyde vapor was from 0.08 mL/m³ to 40 mL/m³（r=0.9991,n=6）,with a（detection） limit of 0.03 mL/m³（the signal-to-noise ratio was 3）.No interference signals were observed while the added（substances） passed through the sensor,such as cyclohexane,n-hexane,chloroform,benzene,（ethanol）,methanol,acetaldehyde,ammonia,water vapor,except ethanol and ammonia.The gas sensor could be worked for more than 80 h and showed the longevity and steady performance.It has been applied to the online determination of formaldehyde successfully.更多还原