| Summary: | In this study, an optical thermometer based on regenerated cellulose fibers modified with YF<sub>3</sub>: 20% Yb<sup>3+</sup>, 2% Er<sup>3+</sup> nanoparticles was developed. The presented sensor was fabricated by introducing YF<sub>3</sub> nanoparticles into cellulose fibers during their formation by the so-called Lyocell process using N-methylmorpholine N-oxide as a direct solvent of cellulose. Under near-infrared excitation, the applied nanoparticles exhibited thermosensitive upconversion emission, which originated from the thermally coupled levels of Er<sup>3+</sup> ions. The combination of cellulose fibers with upconversion nanoparticles resulted in a flexible thermometer that is resistant to environmental and electromagnetic interferences and allows precise and repeatable temperature measurements in the range of 298–362 K. The obtained fibers were used to produce a fabric that was successfully applied to determine human skin temperature, demonstrating its application potential in the field of wearable health monitoring devices and providing a promising alternative to thermometers based on conductive materials that are sensitive to electromagnetic fields.
|
|---|