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(a) Schematic showing luminescence sensing of dipicolinic acid using core-shell nanostructures. (b) Ratiomeric curves obtained by plotting the Tb to Eu luminescence signal intensities exhibited by Tb-EDTA functionalized Gd1.96:Eu0.04(BDC)3(H2O)4 against DPA concentration (red = 544 nm/592 nm, black = 544 nm/615 nm). The inset shows the linear relationship at low DPA concentrations.[22]
