Abstract
Organically modified silicate (ORMOSIL) sol-gel matrices doped with oxygen-sensitive fluorescence indicators have shown great potential for optical sensing applications. In this work, the luminescence decay behavior of ruthenium(II)-tris-4,7-diphenyl-1,10-phenanthroline perchlorate dissolved in different ORMOSIL matrices was studied. This was done in order to investigate the effect of organic modification on the oxygen sensing properties of the doped sol-gel materials. Bulk xerogels were synthesized from an organically modified precursor, methyltrimethoxysilane (MTMS), tetraethyl orthosilicate (TEOS), and an equimolar mixture of the two. Systematic changes in composition were conducted to examine the structural properties of sol-gel silicates for possible oxygen supports. Luminescence quenching behavior was analyzed as a function of varying sol-gel composition and oxygen partial pressure. The Stern-Volmer quenching ratio was found to increase with increasing MTMS content. In addition, phase fluorimetric analysis was conducted on all doped sol-gel samples to examine the accuracy of the luminescence decay times.
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Acknowledgments
The authors would like to acknowledge the generous support for this research granted by the National Science Foundation (NSF), the New Jersey Commission on Science and Technology (NJCST), and the Fiber Optic Materials Research Program (FOMRP) at Rutgers University.
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Murtagh, M.T., Kwon, H.C., Shahriari, M.R. et al. Luminescence probing of various sol-gel hosts with a Ru(II) complex and the practical ramifications for oxygen-sensing applications. Journal of Materials Research 13, 3326–3331 (1998). https://doi.org/10.1557/JMR.1998.0452
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DOI: https://doi.org/10.1557/JMR.1998.0452