1 research outputs found
Benefits of Silica CoreāShell Structures on the Temperature Sensing Properties of Er,Yb:GdVO<sub>4</sub> Up-Conversion Nanoparticles
We studied the temperature-dependent
luminescence of GdVO<sub>4</sub> nanoparticles co-doped with Er<sup>3+</sup> (1 mol %) and Yb<sup>3+</sup> (20 mol %) and determined
their thermal sensing properties through the fluorescence intensity
ratio (FIR) technique. We also analyzed how a silica coating, in a
coreāshell structure, affects the temperature sensing properties
of this material. Spectra were recorded in the range of biological
temperatures (298ā343 K). The absolute sensitivity for temperature
determination calculated for the coreāshell nanoparticles is
double the one calculated for bare nanoparticles, achieving a thermal
resolution of 0.4 K. Moreover, silica-coated nanoparticles show good
dispersibility in different solvents, such as water, DMSO, and methanol.
Also, they show good luminescence stability without interactions with
solvent molecules. Furthermore, we also observed that the silica coating
shell prevents progressive heating of the nanoparticles during prolonged
excitation periods with the 980 nm laser, preventing effects on their
thermometric applications