O2-Responsive Chemical Sensors Based on Hybrid Xerogels that Contain Fluorinated Precursors

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Abstract:

We report the development and analytical figures of merit associated with several new O2-responsive sensor materials. These new sensing materials are formed by sequestering the luminophore tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) ([Ru(dpp)3]2+) within hybrid xerogels that are composed of two of the following methoxysilanes: tetramethoxysilane, n-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)3]2+-doped composites form visually uniform, crack-free xerogel films that can be used to construct O2 sensors that have linear calibration curves and excellent long-term stability. To the best of our knowledge, the [Ru(dpp)3]2+-doped fluorinated hybrid xerogels also exhibit the highest O2 sensitivity of any reported [Ru(dpp)3]2+-based sensor platform.

Keywords: FLUORINATED PRECURSORS; LUMINESCENCE; O2 DETECTION; SENSORS; XEROGELS

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370206778397489

Affiliations: 1: Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000 2: Department of Electrical Engineering, Bonner Hall, University at Buffalo, The State University of New York, Buffalo, New York 14260

Publication date: September 1, 2006

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