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Article Dans Une Revue Journal of Materials Chemistry C Année : 2021

Temperature sensors based on europium polyoxometalate and mesoporous terbium metal–organic framework

Résumé

The first example of ratiometric luminescent thermometers based on lanthanide molecular species encapsulated in a lanthanide metal–organic framework (MOF) is reported. In EuW10@Tb-TATB, the [EuW10O36]9− polyoxometalate (POM) is incorporated into the cavities of the mesoporous terbium MOF Tb-TATB with two different POM loadings (9.1 and 19.5 wt%). Eu3+ and Tb3+ ions of the POM and MOF, respectively, act as dual emitters. Optical measurements evidence efficient Tb3+-to-Eu3+ energy transfer, suggesting that the EuW10 units are close to terbium centers. These observations are supported by computational investigations whereby a favored localisation of the EuW10 POM in the MOF's pores is found close to Tb-centers evidencing hydrogen bond type interactions between terminal oxygen atoms of the POM and Tb-coordinated water molecules. The reported materials act as temperature sensors in the physiological domain, exhibiting high relative thermal sensitivities of 2.68% K−1 and 2.37% K−1 at 300 K for the 9.1 wt% and 19.5 wt% composites, respectively, with a thermal uncertainty of 0.09 K.
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Dates et versions

hal-03277059 , version 1 (05-07-2021)

Identifiants

Citer

Cédric Viravaux, Olivier Oms, Anne Dolbecq, Emma Nassar, Lucas Busson, et al.. Temperature sensors based on europium polyoxometalate and mesoporous terbium metal–organic framework. Journal of Materials Chemistry C, 2021, ⟨10.1039/d1tc01532j⟩. ⟨hal-03277059⟩
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