Photothermal Heating and Real-Time In Situ Luminescent Thermometry with Iron Oxide Core-Silica Shell Nano-Objects

abstract

In a world increasingly focused on precision and efficiency, achieving reliable nanoscale thermal feedback in nanoparticle-assisted heating presents significant challenges. It requires meticulous control over the morphology of nano-objects and the precise spatial arrangement of the heater and the local temperature probe, both of which are critical for accurate surface temperature readouts. In this work, real-time nanoscale temperature measurements are presented during the nanoparticle-assisted photothermal heating by using new nano-objects consisting of single iron oxide nanoparticles encased in stellate-like silica shells, loaded with a luminescent coordination compound, namely [(Tb/Eu)9(acac)16(mu 3-OH)8(mu 4-O)(mu 4-OH)]. These multifunctional nano-objects act as efficient light-triggered nano-heaters and as ratiometric luminescent thermometers operating between 20-65 degrees C in water with excellent cyclability and good maximum relative thermal sensitivity of 0.75 +/- 0.02% degrees C-1 at 65 degrees C and thermal uncertainty of 1 degrees C. Real-time in situ temperature monitoring via the Tb3+/Eu3+ luminescence intensity ratio during photothermal heating under 808 nm irradiation demonstrates reproducibility and reliable thermal feedback, highlighting its potential for advanced temperature-responsive applications.

keywords

ASSISTED ENERGY-TRANSFER; MAGNETIC HYPERTHERMIA; MOLECULAR THERMOMETER; HIGH VALUES; NANOPARTICLES; TEMPERATURE; THERAPY; NANOCRYSTALS; NANOSPHERES; PARTICLES

subject category

Chemistry; Science & Technology - Other Topics; Materials Science; Physics

authors

Sater, FA; Félix, G; Sene, S; Gunatilake, UB; Bouvet, B; Pelluau, T; Oliviero, E; Neto, ANC; Carlos, LD; Albela, B; Bonneviot, L; Guari, Y; Larionova, J

Groups

G2 - Photonic, Electronic and Magnetic Materials

Projects

CICECO - Aveiro Institute of Materials (UIDB/50011/2020)

CICECO - Aveiro Institute of Materials (UIDP/50011/2020)

Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)

acknowledgements

The authors thank the University of Montpellier, CNRS for financial support. L.C. thanks the projects CICECO-Aveiro Institute of Materials, UIDB/50011/2020 (DOI 10.54499/UIDB/50011/2020),UIDP/50011/2020 (DOI 10.54499 /UIDP/50011/2020), and LA/P/0006/2020 (DOI 10.54499/LA/P/0006/2020) financed by Por-tuguese funds through the FCT/MCTES (PIDDAC). A.C.N. and J.L. acknowledge support from the Portugal-France 2024 PESSOA program.J.L. and U.B.G. thank the programm "tremplin ERC" of the University of Montpellier for financial support. The work was developed within the scope of the ANR project Killer (ANR-22-CE09-0026), and the authors are grateful for the funding. B.A. and L.B. thank the French "Ministerede l' Enseignement Superieur et de la Recherche (MESR)" as well as the ENS de Lyon for the PhD funding (CDSN). The authors are grateful toUAR2041 PAC Chimie Balard for measurements.