Figure 3

(a) The comparison of the fluorescence quenching intensity of the IUST-3 (1 mg) in water (2 ml) among the aromatic compounds (1 mM, 100 µl), (b) Photoluminescence spectra of the IUST-3 with gradual addition of 4-NA (1 mM, 10 µL addition each time), (c) Stern–Volmer plot of I0/I versus 4-NA concentration in the IUST-3 aqueous suspension (insert: enlarged view of a selected area), (d) Selective detection of 4-NA on the IUST-3 in the presence of different aromatic compounds in water.