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Steady-state fluorescence measurements over time (excitation 380 nm and emission 500 nm) of the dry optical fiber with six layers, followed by three cycles of Hg(II) aqueous solutions with in the following concentrations: 0, 0.01, 0.05, 0.1, 0.799, 1.99 and 2.69 μM. (1) The fiber was immersed in water, (2) removed from water, and (3) immersed in Hg(II) 0.01 μM. Reprinted with permission from Ref. [36].
