Abstract
In this work, we report on the synthesis and investigation of new hybrid multifunctional iron oxide nanoparticles (IONPs) coated by coumarin-bound copolymer, which combine magneto- or photothermal heating with luminescent thermometry. A series of amphiphilic block copolymers, including Coum-C(11)-PPhOx(27)-PMOx(59) and Coum-C(11)-PButOx(8)-PMOx(42) bearing luminescent and photodimerizable coumarin moiety, as well as coumarin-free PPhOx(27)-PMOx(57), were evaluated for their utility as luminescent thermometers and for encapsulating spherical 26 nm IONPs. The obtained IONP@Coum-C(11)-PPhOx(27)-PMOx(59) nano-objects are perfectly dispersible in water and able to provide macroscopic heating remotely triggered by an alternating current magnetic field (AMF) with a specific absorption rate (SAR) value of 240 W.g(-1) or laser irradiation with a photothermal conversion efficiency of η = 68%. On the other hand, they exhibit temperature-dependent emission of coumarin offering the function of luminescent thermometer, which operates in the visible region between 20 °C and 60 °C in water displaying a maximal relative thermal sensitivity (S(r)) of 1.53%·°C(-1) at 60 °C.