Ratiometric highly sensitive luminescent nanothermometers working in the room temperature range. Applications to heat propagation in nanofluids

• DOI: 10.1039/c3nr02335d
• Publication Date: 2013-06-18T09:04:32Z
• Authors: Carlos D. S. Brites; Patrícia P. Lima; Nuno J. O. Silva; Angel Millán; Vitor S. Amaral; Fernando Palacio; Luís D. Carlos
• Keywords: Atmospheric temperature range; Nanofluidics

There is an increasing demand for accurate, non-invasive and self-reference temperature measurements as technology progresses into the nanoscale. This particularly so in micro- nanofluidics where comprehension of heat transfer thermal conductivity mechanisms can play a crucial role areas diverse energy cell physiology. Here we present two luminescent ratiometric nanothermometers based on magnetic core coated with organosilica shell co-doped Eu3+ Tb3+ chelates. The design hybrid host chelate ligands permits working nanofluid at 293–320 K emission quantum yield 0.38 ± 0.04, maximum relative sensitivity 1.5% K−1 293 spatio-temporal resolution (constrained by experimental setup) 64 × 10−6 m/150 10−3 s (to move out 0.4 – uncertainty). propagation velocity nanofluid, (2.2 0.1) m s−1, was determined 294 using nanothermometers' Eu3+/Tb3+ steady-state spectra. no precedent such measurement thermographic measured from same nanoparticles used to measure temperature.