酸催化剂浓度对钌络合物/溶胶-凝胶薄膜的发光氧气传感性能的影响  

Effects of Acid Catalyzer Concentration on the Performance of Luminescent Oxygen Sensing of Ruthenium Complex Doped Sol-gel Film Systems

作　　者：朱辉[1] 马於光[1] 刘宇[1] 樊玉国[1] 沈家骢[1] 

机构地区：[1]吉林大学超分子结构与材料教育部重点实验室,吉林长春130023

出　　处：《发光学报》2002年第1期57-61,共5页Chinese Journal of Luminescence

基　　金：国家自然科学基金资助项目 ( 5 980 30 0 5 )

摘　　要：以正硅酸乙酯 (TEOS)为原料在乙醇共溶剂和不同盐酸催化剂浓度条件下 ,采用溶胶 凝胶法制得含钌络合物发光分子Ru(dpp) 2 + 3 的硅氧烷预聚液 ,通过旋转涂敷以及凝胶陈化干燥处理制备了一系列氧气敏感的发光薄膜。通过凝胶载体中发光分子在不同氧浓度下的发光猝灭行为 ,探讨了盐酸催化剂浓度对载体微结构和发光分子微环境的影响。结果表明 :随着盐酸催化剂浓度减小 ,薄膜的猝灭响应 (Q)、Stern Volmer系数 (KSV)以及响应时间 (猝灭时间tQ 和恢复时间tR)均得到极明显的改善。传感器性能的改善主要归因于随着盐酸催化剂浓度减小 。In this paper, the tetraethoxysilane (TEOS) precursor is hydrolyzed with ethanol as co-solvent under various concentrations of hydrochloric acid catalyzer to prepare the alkoxysilane pre-polymer solutions containing the luminescent Ru(dpp) 2+ 3 complex through sol-gel process. A series of oxygen-sensing films were fabricated by spin coating of such pre-polymer solutions onto glass slides followed by aging and drying of resultant gels. The effects of acid catalyzer concentration on the micro-structures of sol-gel matrices and the micro-environments of luminescent molecules are revealed by the luminescent quenching behaviors of Ru(dpp) 2+ 3 complex within such sol-gel matrices under various oxygen concentrations.It is shown that the maximum emission peak of Ru(dpp) 2+ 3 in sol-gel matrices is almost independent on the acid catalyzer concentration, suggesting that very dinky change of chemical micro-circumstance around Ru(dpp) 2+ 3 complex can induced. Compared in ethanol solution, the emission peak of Ru(dpp) 2+ 3 in solid state exhibits a red shift for about 14nm, and the red shift for Ru(dpp) 2+ 3 in sol-gel matrix is only 4nm, suggesting that such matrices are excellent dispersoid for Ru(dpp) 2+ 3 complex. The quenching responses of all prepared oxygen sensors generally exhibit excellent stability, reproducibility and high signal-to-noise ratio. The sensor performances such as quenching response Q, Stern-Volmer coefficient K SV and response times (both quenching time t Q and resuming time t R) are improved with decreasing acid catalyzer concentrations. Since the acid catalyzer concentration has almost no effect on the chemical micro-circumstance around Ru(dpp) 2+ 3 complex, it seems that these improvements of sensor performance are mainly due to faster diffusion rate of oxygen in sol-gel matrices and higher collisional probability of oxygen with Ru(dpp) 2+ 3. Two facts may contribute to such improvements: firstly, the sol-gel matrices with more open

关 键 词：溶胶-凝胶 光致发光 氧气传感器 盐酸 催化剂 浓度 薄膜发光 钌铬合物 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置] O648.22[自动化与计算机技术—控制科学与工程]