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Spectra of WPNFs combined with Congo red and 8-anilino-1-naphthalenesulfonic acid (ANS). (a) Absorbance spectra of Congo red combined with WPNFs; (b) absorbance intensity of Congo red combined with WPNFs at 540 nm; (c) ANS intrinsic fluorescence spectra of WPNFs; and (d) ANS fluorescence peak and intensity at the maximum of the emission curve.
