荧光指示剂载体对荧光法溶氧传感器荧光膜性能的影响

Effect of Phosphor Carriers on Performance of Fluorescent Membranes for Dissolved Oxygen Sensors

以沉淀白炭黑、气相白炭黑和MQ树脂负载荧光指示剂Ru(dpp)3Cl2,添加到二甲基硅橡胶,制备氧敏感荧光膜,研究指示剂载体和用量对荧光膜荧光输出的影响。结果表明:纯硅橡胶荧光膜的荧光输出很低,SiO2填料可作荧光指示剂的载体提高指示剂的分散和荧光效率,SiO2填料提高荧光效率的能力为MQ树脂>气相白炭黑>沉淀白炭黑。含10%SiO2载体的硅橡胶制备的荧光膜,其荧光输出随指示剂用量线性增加,直至指示剂用量达0.1%,但SiO2填料降低荧光膜的响应速度。

Precipitated silica, fumed silica and synthesized MQ resin were adopted to adsorb phosphor Ru（dpp）3C12 ,and the pigmented fillers were mixed with polydimethylsiloxane to fabricate oxygen-sensitive fluorescent membranes. The effects of the SiO2 filler type and phosphor content on the performance of the fluorescent membranes were investigated. The fluorescence output of the membrane without fillers was very poor. SiO2 fillers could function as phosphor carriers to improve the dispersing of the phosphor and enhance the fluorescence efficiency of the phosphor. In regard to the enhancement capacity, the SiO2 fillers could be ranked in MQ resin, fumed silica and precipitated silica. Filled with 10% of SiO2, the fluorescence output of the membranes increased lineally with phosphor content as the content was below 0.1%. But SiO2 carriers reduced the response speed of the membranes to dissolved oxygen content.