Abstract
Excitation energy transfer, between a dye pair (acriflavine and rhodamine 6G) doped in an ion exchange polymer matrix (Nafion ®), has been investigated from the viewpoint of fabrication of an optical pH sensor. The study is done by steady state as well as time domain fluorescence measurements. Using fixed donor–acceptor concentration, excitation energy transfer in the pH range 2–12 has been found to follow Förster function for dipole–dipole interaction. Further, pH has been calibrated by the energy transfer parameters, e.g. overlap integral Ω DA, energy transfer efficiency η T, rate of energy transfer K R, critical transfer distance R 0A and reduced concentration γ 0A in the range 2–12 and is found to show an approximately linear dependence. These results in Nafion ® matrix are similar to those found by us in solution [Sens. Actuators: B Chem. 63 (2000) 18]. The system appears to be attractive for optical pH sensor with reversibility and sensitivity of 0.01 pH units.
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