Irradiation-responsive polysulfone film as a colorimetric UVA/UVB differentiator

Bernardo Monteiro, João Paulo Leal, Mani Outis, Maria Helena Casimiro, Cláudia C. L. Pereira

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
14 Downloads (Pure)


A wearable, small size, flexible and energy consumable free colorimetric detector of UVA radiation and UVB/UVA differentiation was created based on the peculiar stimuli-responsive behaviour of an imidazolium based ionic liquid. Semi-transparent polysulfone films are transformed into opaque and homogenous red films under UVA radiation (315-360 nm), while lower wavelength exposure (280-315 nm) induces increased emission detectable under dark light, with no colour modification of the film under visible light. Thermal analysis (TGA and DSC), spectroscopic analysis (FT-IR, 1H-NMR and UV-Vis), scanning electronic microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) were conducted to elucidate confinement mechanism and irradiation effects.

Original languageEnglish
Pages (from-to)5199-5207
Number of pages9
JournalJournal of Materials Chemistry C
Issue number15
Publication statusPublished - 31 Mar 2023


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