Er3+ doped nanoparticles as upconversion thermometer probes in confined fluids

• Published in: Physical chemistry chemical physics : PCCP Vol. 25; no. 28; pp. 19254 - 19265
• Main Authors: Zhou, Yujiao, Ledoux, Gilles, Bois, Laurence, Descartes, Sylvie, Bouscharain, Nathalie, Chassagneux, Fernand, Martini, Matteo, Bakary, Yamaldi Midiladji, Journet, Catherine, Philippon, David
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 19.07.2023
• Subjects: Dispersion; Erbium; Gadolinium; Nanoparticles; Nanosensors; Photoluminescence; Rheological properties; Shear rate; Temperature measurement; Thermometers; Thermometry; Tribology; Upconversion; Ytterbium
• ISSN: 1463-9076; 1463-9084
• DOI: 10.1039/d3cp02218h

Non-contact temperature measurement at the nanoscale by photoluminescence using a nano-sensor in a confined fluid has been performed in the present work. Upconversion lanthanide-doped nanoparticles applied to ratiometric thermometry could be considered as a self-referenced nanosensor. Gadolinium orthovanadate (GdVO4) nanoparticles doped with Yb3+ and Er3+ were synthesized and then dispersed in an ester-based fluid. Rheological measurements show that the viscosity of the dispersed NP suspension remains unchanged up to a shear rate of 10−4 s−1 at 393 K. The NP suspension allows luminescence intensity ratio (LIR) thermometry up to 473 K with a relative sensitivity of 1.17% K−1 with a NIR laser. Then, the temperature calibration by coupling the high pressure (1.08 GPa max) confirmed the applicability of NPs as a thermosensor in a variable pressure environment. According to these results, the fluid containing GdVO4:Yb3+/Er3+ nanoparticles can be used for temperature sensing in a pressurized environment for further application in tribology.