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MgTiO3:Mn4+ a multi-reading temperature nanoprobe.

Estelle Glais1,2, Vesna Đorđević3, Jelena Papan3

  • 1Sorbonne Université, CNRS UMR7574, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris 4 Place Jussieu 75005 Paris France.

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Magnesium titanate (MgTiO3) nanoparticles doped with manganese (Mn4+) show promise as optical thermal sensors. These nanomaterials exhibit excellent temperature sensitivity and resolution for luminescence thermometry applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Spectroscopy

Background:

  • Optical thermometry relies on temperature-dependent luminescence properties of materials.
  • Developing sensitive and accurate nanoscale temperature probes is crucial for various scientific and technological applications.
  • Manganese-doped magnesium titanate (MgTiO3:Mn4+) exhibits unique luminescence characteristics influenced by temperature.

Purpose of the Study:

  • To synthesize and characterize MgTiO3:Mn4+ nanoparticles for optical thermometry.
  • To investigate the temperature-dependent luminescence of Mn4+ in the MgTiO3 host.
  • To develop and evaluate multiple thermometry approaches based on luminescence intensity ratios and lifetime variations.

Main Methods:

  • Molten salt assisted sol-gel synthesis of MgTiO3:Mn4+ nanoparticles (size ~63.1 ± 9.8 nm).
  • Spectroscopic analysis of luminescence properties at varying temperatures (-250 °C to 50 °C).
  • Characterization of thermometric performance using luminescence intensity ratios and fluorescence lifetime measurements.

Main Results:

  • Two luminescence intensity ratio methods were explored, yielding maximal sensitivity of 0.9% °C−1 at low temperatures and 0.6–1.2% °C−1 over a broader range.
  • Fluorescence lifetime measurements demonstrated a drastic decrease with increasing temperature.
  • An impressive high sensitivity of 4.1% °C−1 at 4 °C and a temperature resolution of 0.025 °C were achieved using lifetime variations.

Conclusions:

  • MgTiO3:Mn4+ nanoparticles are highly suitable for nanoscale luminescence thermometry.
  • The developed thermometry methods offer accurate temperature sensing across different ranges.
  • These nanoparticles present a promising platform for advanced optical temperature probes.