4 years ago

Luminescent carrageenan hydrogels containing lanthanopolyoxometalates

Tito Trindade, Helena Seguro Nogueira, Rui Silva Carvalho, Sara Fateixa, Ana Luísa Daniel-da-Silva
In this research we have investigated the use of lanthanopolyoxometalates (LnPOM, K9[Ln(W5O18)2], Ln= Eu, Tb) as luminophores in thermosensitive polysacharides such as carrageenan hydrogels. We demonstrate that the LnPOM species retain the characteristic photoluminescence of the Ln(III) when incorporated in the gel matrix. Moreover, the strength of the carrageenan hydrogels increases by increasing the amount of LnPOM added, due to the effect of K+ as cross-linker, but without compromising the photoluminescent behaviour. The nanoscale homogeneity is crucial regarding applications of hydrogels responsive to external stimuli. This research shows that the final LnPOM loaded hydrogels are homogeneous as consequence of the diffusional behaviour of the luminophore species within the gel network. Therefore, we anticipate that the association of carrageenan hydrogels to luminescent lanthanopolyoxometalates might be of great relevance for optical devices and in particular for bioimaging techniques.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201700888

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