Fig. 13　a) Schematic illustration of the chemosencer redistribution upon the binding to a hydrophobic or hydrophilic phosphate derivative between the hydrophobic hydrogel nanofiber and the hydrophilic cavity. b) Fluorescence spectral change of 6 embedded in hydrogel 3 upon addition of ATP (left) or PhP (right) (λex = 322nm). c) Illustration of the guest-dependent FRET system using 7 and 8 by the addition of ATP or PhP in the hydrogel 3. d) Fluorescence spectral change of 3 including 7 and 8 in the titration of ATP (left) or PhP (right) (λex = 393 nm).