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Paper
Analyst, 2008, 133, 616 - 620, DOI: 10.1039/b714625f
Uranyl-specific binding at a functionalised interface: a chemophotonic fibre optic sensor platform
Neil W. Hayes, Clare J. Tremlett, Patricia J. Melfi, Jonathon D. Sessler and Andrew M. Shaw
Detection of radiological materials in the solution phase is restricted by conventional radiation-counting techniques owing to extreme attenuation. Chemical sensing of the resultant radiological species such as uranyl UO22+ is possible on the surface of a plastic or glass fibre optic. A dihydroxy isoamethryin complex is tethered to the fibre surface which has a large extinction coefficient (119
000 M-1 cm-1 at 
= 439 nm) and changes colour upon binding UO22+. The spectral changes are greater on the surface than in solution and binding is specific to UO22+ with small interferences from Gd3+. Monitoring the spectral response in three detector bands in the red, green and blue enable the optical power change to be measured with sensitivities of 1 mdB, allowing UO22+ to be detected confidently at 50–100 ppb levels. Real-time kinetic analysis enables discrimination between the target species and possible interferents.
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