改性SiO2载体对邻菲咯啉钌荧光特性及氧敏感荧光膜性能的影响

为提高极性荧光指示剂Ru(dpp)₃Cl₂在非极性硅橡胶中的分散性,以沉淀白炭黑、气相白炭黑和甲基MQ树脂,载负荧光指示剂Ru(dpp)₃Cl₂,再填充到二甲基硅橡胶(PDMS)中,制备氧敏感荧光膜.以分光光度计和荧光光谱仪,研究载体种类对Ru(dpp)₃Cl₂的吸附性、荧光特性及氧敏感荧光膜性能的影响.白炭黑载负Ru(dpp)₃Cl₂的荧光发射光谱相对其稀溶液约红移20 nm.载体表面的甲基可减弱SiO₂载体对Ru(dpp)₃Cl₂分子的吸附性和相互作用,减少荧光发射光谱的红移12 nm,提高荧光强度近10倍.白炭黑有助改善Ru(dpp)₃Cl₂在PDMS中的分散性和氧敏感荧光膜的荧光输出和猝灭比,尤以MQ树脂的效果最为显著.

Effect of Phosphor Carriers on Fluorescence of Ruthenium Phenanthroline and Performance of Oxygen-sensitive Fluorescent Membranes

To increase the dispersion of polar phosphor Ru(dpp)₃Cl₂ in apolar silicone rubber and produce oxygen-sensitive fluorescent membranes with high performance, fumed silica, precipitated silica and MQ resin were adopted as phosphor carriers to adsorb Ru(dpp)₃Cl₂ from solution, then added to polydimethylsiloxane and cast into fluorescent membranes. The adsorbing ability of the carrier to Ru(dpp)₃Cl₂ was evaluated with spectrophotometer and the effect of the carrier on the fluorescent characteristics of Ru(dpp)₃Cl₂ was analyzed with spectroscope. The effect of the carrier on the performance of the oxygen-sensitive fluorescent membranes was studied. Compared to the fluorescent spectrum of Ru(dpp)₃Cl₂ in ethanol solution, the fluorescent emission spectra of Ru(dpp)₃Cl₂ red shifted 20 nm after adsorbed on silica. Methyl group onto silica depressed the interaction of silica with Ru(dpp)₃Cl₂ and the amount of adsorbed Ru(dpp)₃Cl₂. MQ resin could reduce the red-shift of fluorescent emission spectrum more than 10 nm and increase the fluorescence intensity by 10 times. In oxygen-sensitive fluorescent membranes, MQ resin could increase the dispersion of Ru(dpp)₃Cl₂ in PDMS and improve the fluorescent output of the membranes.