Page 339 - 00. Complete Version - Progress Report IPEN 2014-2016

Materials and Nanotechnology | Progress Report 339

nescent magnetic nanomaterials (MFe2O4 @QD,Ln) complexes/compound present very inter-
esting superparamagnetic and photonic properties. The magnetic properties were explored at
5 and 300K temperature and showed that extent of coating and crystallinity affect the satura-
tion magnetization values of nanoparticles. Although ferrite is a strong luminescence quencher,
the coating of the MFe2O4 nanoparticles has overcome this difficulty. The intramolecular en-
ergy transfer in the nanomaterials from the T1 excited triplet states of TTA and ACAC ligands
to the 5D0(Eu3+) and 5D4(Tb3+) emitting levels has been determined. In addition to the super-
paramagnetic behavior, these nanophosphors may act as emitting layer of red and green light
converting molecular devices (LCMDs) and are responsible for new ways in the diagnostic and
teranostic field. This research has been developed in collaboration with the LNLS, Chemistry
institute of University of São Paulo and Campinas University (Figure. 65).

Figure 65. Synthesis protocol of MnFe2O4@CH-Eu(TTA)3(TPPO)2(left); MnFe2O4@CH-Eu(TTA)3(TPPO)2 compos-
ite, and the composite under effect of magnetic field(upper -right); Magnetization curve of MnFe2O4@CH-Eu-
(TTA)3(TPPO)2 inserted fig solution of chitosan and complex under 366nm excitation (down-right).

Luminescent material associated to a
metal nanoparticles and Plasmon effect

The use of these metallic nanostructures to fa-
vorably modify the optical properties of fluo-
rophores in order to increase the intensity of
fluorescence emission. The project aims to
synthesize metallic nanoparticles using green
chemistry and use these nanoparticles in pho- Figure 66. Plasmonic effect in some materials produced in IPEN.
tonic materials. Particles of Ag0, Au0 and Cu0
are produced using green chemistry protocols and then are associated to luminescent mate-
rials based on lanthanides to improve the efficiency of the materials luminescence. They are
now being targeted for biological applications of nanoplasmonic as flow cytometry, immuno-
assays, cell imaging and bioassays where it can improve fluorescence signatures (Figure. 66).