title: O(2)-responsive chemical sensors based on hybrid xerogels that contain fluorinated precursors.
abstract: We report the development and analytical figures of merit associated with several new O(2)-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 O(2) 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 O(2) sensitivity of any reported [Ru(dpp)(3)](2+)-based sensor platform.
authors.affiliation: Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, USA.
authors.forename: Rachel M
authors.initials: RM
authors.lastname: Bukowski
authors.forename: Michael D
authors.initials: MD
authors.lastname: Davenport
authors.forename: Albert H
authors.initials: AH
authors.lastname: Titus
authors.forename: Frank V
authors.initials: FV
authors.lastname: Bright
mesh_terms: D015374:Biosensing Techniques; D005782:Gels; D049449:Luminescence; D049408:Luminescent Agents / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D010100:Oxygen / Q000032:analysis*; D044367:Phase Transition; D010618:Phenanthrolines / Q000737:chemistry*; D012680:Sensitivity and Specificity; D012821:Silanes / Q000737:chemistry; D005466:Fluorocarbons
chemical_list: D005782:Gels; D049408:Luminescent Agents; D009942:Organometallic Compounds; D010100:Oxygen; D010618:Phenanthrolines; D012821:Silanes; C514745:3,3,3-trifluoropropyl-trimethoxysilane; C514747:pentafluorophenylpropyl-trimethoxysilane; D005466:Fluorocarbons; C514746:phenethyl-trimethoxysilane; C492568:propyltrimethoxysilane; C061205:tetramethoxysilane; C041132:tris(4,7-diphenyl-1,10-phenanthroline)ruthenium (II); C071717:trimethoxysilane