Abstract
We report the development and analytical figures of merit associated with several new O<sub>2</sub>-responsive sensor materials. These new sensing materials are formed by sequestering the luminophore tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) ([Ru(dpp)<sub>3</sub>]<sup>2+</sup>) within hybrid xerogels that are composed of two of the following methoxysilanes: tetramethoxysilane, <i>n</i>-propyl-trimethoxysilane, 3,3,3-trifluoropropyl-trimethoxysilane, phenethyl-trimethoxysilane, and pentafluorophenylpropyl-trimethoxysilane. Steady-state and time-resolved luminescence measurements are used to investigate these hybrid xerogel-based sensor materials and elucidate the underlying reasons for the observed performance. The results show that many of the [Ru(dpp)<sub>3</sub>]<sup>2+</sup>-doped composites form visually uniform, crack-free xerogel films that can be used to construct O<sub>2</sub> sensors that have linear calibration curves and excellent long-term stability. To the best of our knowledge, the [Ru(dpp)<sub>3</sub>]<sup>2+</sup>-doped fluorinated hybrid xerogels also exhibit the highest O<sub>2</sub> sensitivity of any reported [Ru(dpp)<sub>3</sub>]<sup>2+</sup>-based sensor platform.
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