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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 68,
  • Issue 11,
  • pp. 1302-1305
  • (2014)

Enhanced Performance from a Hybrid Quenchometric Deoxyribonucleic Acid (DNA) Silica Xerogel Gaseous Oxygen Sensing Platform

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Abstract

A complex of salmon milt deoxyribonucleic acid (DNA) and the cationic surfactant cetyltrimethylammonium (CTMA) forms an organic-soluble biomaterial that can be readily incorporated within an organically modified silane-based xerogel. The photoluminescence (PL) intensity and excited-state luminescence lifetime of tris(4,7′-diphenyl-1,10′-phenanathroline) ruthenium(II) [(Ru(dpp)3]2+, a common O2 responsive luminophore, increases in the presence of DNA-CTMA within the xerogel. The increase in the [Ru(dpp)3]2+excited-state lifetime in the presence of DNA-CTMA arises from DNA intercalation that attenuates one or more non-radiative processes, leading to an increase in the [Ru(dpp)3]2+ excited-state lifetime. Prospects for the use of these materials in an oxygen sensor are demonstrated.

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