Abstract
In this study, polyacrilonitrile (PAN) nanoflowers were doped with one of five temperature-sensitive fluorescent materials (rhodamine B, sulforhodamine B, tris(4,7-diphenyl-1,10-phenanthroline) ruthenium (II) dichloride, tris(2,2′-bipyridyl)dichloro-ruthenium (II) hexahydrate (RuB) or 5 (6)-carboxyfluorescein). The fluorescent material-doped PAN nanoflowers were then incorporated into a supporting polymer matrix of polyurethane-based hydrogel D4 or ethyl cellulose to fabricate fluorescence-based temperature-sensing membranes. Among the five membranes, the one prepared with RuB-doped PAN nanoflowers (RuB@PAN) was highly sensitive and stable with good reversibility in both aqueous and gaseous environments in the temperature range of 5–60 °C. PAN nanoflowers doped with a temperature-insensitive dye, coumarin 545 T (CM5T) (CM5T@PAN) was used as the reference in a ratiometric fluorescence-based temperature-sensing membrane constructed with it and RuB@PAN. It showed a short response time and high sensitivity, and its suitability for the noninvasive temperature monitoring of a biological process was also confirmed.
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