Fig. 12. Photographs of an uncoated PE substrate (a and c) and a PVA/DBA-coated PE substrate (b and d) after immersion in ethanol in the presence of a boronic acid-appended rhodamine dye (1) as a chemical modifier. The photographs were taken under ambient light (a and b) and UV light at 365 nm (c and d), respectively. (e) Fluorescence spectra of the uncoated PE substrate (open circle) and the PVA/DBA-coated PE substrate (solid circle) after the treatments.
