A susceptibility thermometer for use at very low temperatures

Betts, David S.; Edmonds, David; Keen, B.E.; Matthews, P. W.

doi:10.1088/0950-7671/41/8/414

“…Paramagnetic materials were previously reported as temperature sensors based on the thermal dependence of the magnetic susceptibility. [59][60][61] Taking into account the Curie law (χ = C/T with χ being the magnetic susceptibility and C the Curie constant), such systems exhibit only a significant sensitivity at very low temperatures. Furthermore, one of the signatures of an SMM is its relaxation dynamics, characterized by the relaxation time, τ, which represents the average time needed for the magnetization to randomly flip due to thermal fluctuations.…”

Section: Introductionmentioning

confidence: 99%

“…More specifically, the temperature dependence of 4 f –4 f electronic transitions in lanthanide‐based materials could be somehow compared to rules governing the magnetic properties. Paramagnetic materials were previously reported as temperature sensors based on the thermal dependence of the magnetic susceptibility [59–61] . Taking into account the Curie law ( χ = C / T with χ being the magnetic susceptibility and C the Curie constant), such systems exhibit only a significant sensitivity at very low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Luminescent Single‐Molecule Magnets as Dual Magneto‐Optical Molecular Thermometers

Zanella,

Aragon‐Alberti,

Brite

et al. 2023

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Luminescent thermometry allows the remote detection of the temperature and holds great potential in future technological applications in which conventional systems could not operate. Complementary approaches to measuring the temperature aiming to enhance the thermal sensitivity would however represent a decisive step forward. For the first time, we demonstrate the proof‐of‐concept that luminescence thermometry could be associated with a complementary temperature readout related to a different property. Namely, we propose to take advantage of the temperature dependence of both magnetic (canonical susceptibility and relaxation time) and luminescence features (emission intensity) found in Single‐Molecule Magnets (SMM) to develop original dual magneto‐optical molecular thermometers to conciliate high‐performance SMM and Boltzmann‐type luminescence thermometry. We highlight this integrative approach to concurrent luminescent and magnetic thermometry using an air‐stable benchmark SMM [Dy(bbpen)Cl] (H2bbpen=N,N′‐bis(2‐hydroxybenzyl)‐N,N′‐bis(2‐methylpyridyl)ethyl‐enediamine)) exhibiting Dy3+ luminescence. The synergy between multiparametric magneto‐optical readouts and multiple linear regression makes possible a 10‐fold improvement in the relative thermal sensitivity of the thermometer over the whole temperature range, compared with the values obtained with the single optical or magnetic devices.

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Luminescent Single‐Molecule Magnets as Dual Magneto‐Optical Molecular Thermometers

Zanella,

Aragon‐Alberti,

Brite

et al. 2023

Angewandte Chemie

1

0

View full text Add to dashboard Cite

Luminescent thermometry allows the remote detection of the temperature and holds great potential in future technological applications in which conventional systems could not operate. Complementary approaches to measuring the temperature aiming to enhance the thermal sensitivity would however represent a decisive step forward. For the first time, we demonstrate the proof‐of‐concept that luminescence thermometry could be associated with a complementary temperature readout related to a different property. Namely, we propose to take advantage of the temperature dependence of both magnetic (canonical susceptibility and relaxation time) and luminescence features (emission intensity) found in Single‐Molecule Magnets (SMM) to develop original dual magneto‐optical molecular thermometers to conciliate high‐performance SMM and Boltzmann‐type luminescence thermometry. We highlight this integrative approach to concurrent luminescent and magnetic thermometry using an air‐stable benchmark SMM [Dy(bbpen)Cl] (H2bbpen=N,N′‐bis(2‐hydroxybenzyl)‐N,N′‐bis(2‐methylpyridyl)ethyl‐enediamine)) exhibiting Dy3+ luminescence. The synergy between multiparametric magneto‐optical readouts and multiple linear regression makes possible a 10‐fold improvement in the relative thermal sensitivity of the thermometer over the whole temperature range, compared with the values obtained with the single optical or magnetic devices.

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