Visual temperature sensors are of great significance
for environmental
management and industrial process control. Herein, we developed a
visual sensing approach based on fiber fluorescent imaging by configuring
aggregation-induced emission (AIE)-functionalized CO2-based
poly(propylene carbonate) (PPC). A three-in-one strategy incorporating
AIE (tetraphenylethylene), chain transfer (hydroxyl), and co-catalytic
(pyridinium salt) properties into one system is proposed to synthesize
AIEgen end-labeled PPC as a thermometer material. Based on the twisted
intramolecular charge transfer effect of the AIE unit, the fiber thermometer
obtained by melt spinning transforms the invisible temperature gradient
information into different fluorescent colors that are visible to
the naked eye. In the range of −40 to 140 °C, multiscale
temperature visualization applications, such as regional temperature
detection, internal one-dimensional (1D) and two-dimensional (2D)
temperature mapping, etc., could be implemented at a high resolution
(±1 °C, 10 μm).