Tang Ying, Tehan Elizabeth C, Tao Zunyu, Bright Frank V
Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, USA.
Anal Chem. 2003 May 15;75(10):2407-13. doi: 10.1021/ac030087h.
Novel O2-sensing materials based on spin-coated n-octyltriethoxysilane (Octyl-triEOS)/tetraethylorthosilane (TEOS) composite xerogel films have been synthesized and investigated. These sensors are based on the O2 quenching of tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) ([Ru(dpp)3]2+) sequestered within the xerogels. Scanning electron microscopy and luminescence measurements (steady state and time resolved) have been used to investigate the structure of these films and their analytical figures of merit and determine the underlying reasons for their observed performance. The results show that certain [Ru(dpp)3]2+-doped Octyl-triEOS/TEOS composites form uniform, crack-free xerogel films that can be used to construct high-sensitivity O2 sensors that have linear calibration curves and excellent long-term stability. For example, an 11-month-old sensor based on 50 mol % Octyl-triEOS exhibits more than 4-fold greater sensitivity in comparison to an equivalent sensor based on pure TEOS. Over an 11-month time period, the sensitivity of a pure TEOS-based sensor drops by more than 400% whereas a sensor based on 50 mol % Octyl-triEOS remains stable (RSD = 4%).
基于旋涂正辛基三乙氧基硅烷（Octyl-triEOS）/正硅酸乙酯（TEOS）复合干凝胶薄膜的新型氧传感材料已被合成并研究。这些传感器基于干凝胶中螯合的三（4,7-二苯基-1,10-菲咯啉）钌（II）（[Ru(dpp)3]2+）的氧猝灭。扫描电子显微镜和发光测量（稳态和时间分辨）已被用于研究这些薄膜的结构及其分析品质因数，并确定其观察到的性能的潜在原因。结果表明，某些[Ru(dpp)3]2+掺杂的Octyl-triEOS/TEOS复合材料形成均匀、无裂纹的干凝胶薄膜，可用于构建具有线性校准曲线和优异长期稳定性的高灵敏度氧传感器。例如，一个基于50 mol% Octyl-triEOS的11个月大的传感器与一个基于纯TEOS的等效传感器相比，灵敏度高出4倍以上。在11个月的时间段内，基于纯TEOS的传感器的灵敏度下降超过400%，而基于50 mol% Octyl-triEOS的传感器保持稳定（相对标准偏差 = 4%）。
