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The luminescent rare earth (RE) complex based multifunctional nanocomposites offer new potential applications of multimodal imaging (magnetic resonance imaging (MRI), fluorescent bioimaging, etc.) that can be associated with therapeutic activities. In this study, we report some results obtained with novel multifunctional Fe3O4/Si-amine/Eu(NTA)3nanocomposites that are composed of europium(III) complex with 1-(2-naphthoyl)-3,3,3-trifluoroacetone ligands (NTA) (Eu(NTA)3) and superparamagnetic Fe3O4nanoparticles. These nanocomposites were functionalized with an amine group for biomedicine application. The multifunctional Fe3O4/Si-amine/Eu(NTA)3nanocomposites exhibit both good magnetic behavior of Fe3O4nanoparticles as a core and strong fluorescent property of europium(III) complex. Their characterizations were analyzed by XRD, SEM, EDX and FTIR spectra. The optical properties were studied in detail by UV-VIS spectra and luminescent emission spectra. The magnetic property was estimated by VMS. The effect of concentrations of luminescent Eu(NTA)3complex on luminescent and magnetic properties is discussed.

In this paper, research on a CO catalytic gas sensor based on nano-crystalline perovskite oxide NdFeO3designed for exhaust gas measurement is presented. Nano-crystalline oxide NdFeO3was synthesized by a sol-gel citrate technique. The gas sensing characteristics of this sensor were investigated in the concentration range of CO between 0 and 5?vol.% in air. The influences of C3H8, C4H16gases, relative humidity and air-flow rate on the cross-sensitivity of the CO sensor were also studied.