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Detection of trinitrophenol (TNP) based on optical response of a PDA-microtube waveguide sensor. (a) Schematic diagram. (b) Changes of the outcoupled tip emission intensity (at 640 nm) of the PDA microtube waveguide sensor upon repeated TNP sensing and regeneration cycles (FL in the figure is shorted for the fluorescence, the whole Figure 16 was reprinted with permission from Yang et al. [67]).
