Abstract
Temperature-responsive fluorescence sensors have attracted great attention in recent years. Herein, we designed a series of AIE-based polymer sensors for monitoring the temperature in the physiological environment. In these polymers, a triphenylamine-naphthalimide chromophore (TPANIP) was used as the signal unit which can output the red emission in aggregated state. Different ratios of the temperature-responsive unit (NIPMAM) and the water-soluble unit (N-(2-(2-hydroxyethoxy)ethyl)methacrylamide, HEOEMA) were introduced to adjust the responsibility of the polymers in suitable temperature region and sensitivity. The structural and optical properties of all polymers were investigated by GPC, 1H NMR, FTIR, fluorescence spectroscopy and SEM. Among them, the polymer P1 (TPANIP/NIPMAM = 1/10) without the water-soluble unit shows the best sensing property. It performs a linear response to the temperature at the region of 15–50 °C in its aqueous solution with low concentration (0.5 mg/mL). By optimizing the work medium, polymer P1 can outputs the turn on signals with the increase of temperature. The enhanced emission mode is more suitable for the fluorescent detection that the turn off one.
Published Version
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