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Fig. 4. Normalized fluorescence spectra of ZnTPP in ethanol and ZnTPP in ethanol mixed with water, D-g-PAAan water-based solution, and D-g-PAAan/AuNPs water-based solution; excitation: 421 nm; concentrations: ZnTPP, 0.001 g L−1; D-g-PAAan, 0.080 g L−1; Au, 0.079 g L−1.