title: Highly CO2 sensitive extruded fluorescent plastic indicator film based on HPTS.
abstract: Highly-sensitive optical fluorescent extruded plastic films are reported for the detection of gaseous and dissolved CO2. The pH-sensitive fluorescent dye used is 8-hydroxypyrene-1,3,6-trisulfonic acid trisodium salt (HPTS, PTS(-)) coated on the surface of hydrophilic fumed silica and the base is tetrabutylammonium hydroxide (TBAH). The above components are used to create an HPTS pigment (i.e. HPTS/SiO2/TBAH) with a high CO2 sensitivity (%CO2 (S = 1/2) = 0.16%) and fast 50% response (t50↓) = 2 s and recovery (t50↑) = 5 s times. Highly CO2-sensitive plastic films are then fabricated, via the extrusion of the HPTS pigment powder in low-density polyethylene (LDPE). As with the HPTS-pigment, the luminescence intensity (at 515 nm) and absorbance (at 475 nm) of the HPTS plastic film decreases as the %CO2 in the ambient gas phase increases. The HPTS plastic film exhibits a high CO2 sensitivity, %CO2 (S = 1/2), of 0.29%, but a response time <2 min and recovery time <40 min, which is slower than that of the HPTS pigment. The HPTS plastic film is very stable under ambient conditions, (with a shelf life >six month when stored in the dark but under otherwise ambient conditions). Moreover, the HPTS-LDPE film is stable in water, salt solution and even in acid (pH = 2), and in each of these media it can be used to detect dissolved CO2.
authors.affiliation: Queens University Belfast, David Keir Building, Stranmillis Road, Belfast, BT9 5AG, UK. andrew.mills@qub.ac.uk.
authors.forename: Andrew
authors.initials: A
authors.lastname: Mills
authors.forename: Dilidaer
authors.initials: D
authors.lastname: Yusufu
mesh_terms: D002245:Carbon Dioxide / Q000032:analysis* / Q000737:chemistry; D004355:Drug Stability; D005456:Fluorescent Dyes / Q000737:chemistry*; D006813:Humidity; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D055096:Optical Devices; D020959:Polyethylene / Q000737:chemistry; D011721:Pyrenes / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013451:Sulfonic Acids / Q000737:chemistry*; D013696:Temperature; D014466:Ultraviolet Rays
chemical_list: C538892:8-hydroxy-1,3,6-pyrenetrisulfonic acid; D005456:Fluorescent Dyes; D011721:Pyrenes; D013451:Sulfonic Acids; D002245:Carbon Dioxide; D020959:Polyethylene