Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Journal of materials chemistry. C, Materials for optical and electronic devices, 2023-04, Vol.11 (15), p.5199-527

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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, 1 H-NMR and UV-Vis), scanning electronic microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) were conducted to elucidate confinement mechanism and irradiation effects. This research work presents a photochromic flexible film, for fast and real-time detection and differentiation of UVA and/or UVB radiation. The host-guest system was produced by confining 7% (w/w) of a highly fluorinated ionic liquid in polysulfone.