【摘要】 利用蓝光LED(λmax =4 6 0nm )构建的氧荧光猝灭检测系统 ,考察了不同Ru配合物以甲基硅氧烷(TMOS)和二甲基二甲氧基硅烷 (DiMe DMOS)为共先驱体 ,制备的有机改性溶胶 凝胶 (sol gel)膜内荧光猝灭行为。DiMe DMOS的加入量会影响敏感膜的极性 ,从而影响敏感膜对氧浓度的响应。利用自行构建的装置对水体中氧进行了检测 ,传感膜对氧饱和水溶液测定的相对标准偏差为 1 12 % (n =6 ) ,响应时间为 30s,对氮饱和水溶液测定相对标准偏差为 0 39% (n =6 ) ,响应时间为 90s,敏感膜使用寿命大于 6个月。更多还原

【Abstract】 Different Ru complexes were used in an organically modified sol-gel (ormosil) sensing film to character their quenching behaviors to oxygen. The sensing film with tris-(4,7-diphenyl-1,10-phenanthroline) ruthenium(Ⅱ) [Ru(dpp) 2+ 3] as an indicator was selected because of its characteristics with high quenching efficiency, fast response time, high luminescence intensity and long-term stability. The quenching behavior of the sensing film greatly depended on the content of dimethyldimethoxysilane (DiMe-DMOS) in ormosil because DiMe-DMOS changed the polarity of sensing film. A home-made fluorescence quenching system was set up for oxygen determination based on a blue LED (λ max=460 nm) as an exciting light source. The response time was 30 s from saturated nitrogen to oxygen in water, and 90 s from saturated oxygen to nitrogen.更多还原