Page 335 - 00. Complete Version - Progress Report IPEN 2014-2016

Materials and Nanotechnology | Progress Report 335

down) and structures of SnO2 (right -upper) cent species. The present research synthesize
X-ray powder diffraction (right -middle) chro- rare earth molybdates by the co-precipitation
maticity diagram (right -down ). method as well as characterize these materi-
als by X-ray diffraction, near infrared spectros-
copy, thermogravimetric analysis, scanning
electronic microscopy, transmission electron-
ic microscopy and luminescent studies. This
research focuses three different studies as fol-
lowed :the influence of the vortex speed vari-
ation during co-precipitation in the structure
of the final product, morphology and lumines-
cence properties; the influence of the anneal-
ing temperature also in the structure, mor-
phology and luminescence properties; and
the influence of concentration of the doping
in the luminescence properties. Another im-
portant step of this research is the functional-
ization of nanoparticles using an organosilane
(APTES) to coat and establish points for bind-
ing the particles to biological species. It was
proved that this process was very efficient by
Figure 60. Excitation and Emission spectra of SnO2/
TiO2:Eu3+ nanoparticles (left up and down) and struc- the characterization results and the silica in-
tures of SnO2 (right -upper) X-ray powder diffraction corporation was well succeeded. Specific pros-
(right -middle) chromaticity diagram (right -down ).
tatic cancer (PSA) was then linked to the func-
tionalized nanoparticles to diagnostic prostatic
Synthesis and characterization of cancer by fluoroimmunoassay and levels for
TR2(MoO4)3@SiO2 nanoparticles detection were established. Figure 61.
doped with Eu3+, Tb3+and
Nd3+ for biological labeling

The interest in using rare earths to investigate
the properties and functions of biochemical
systems as well as to determinate biological
substances has increased in several fields, in-
cluding biomarkers as a tool for immunology
(fluoroimmunoassays). Nowadays, the use of
lanthanides in the diagnosis of various diseas- Figure 61. Ilustration of Eu:Y2(MoO4)3 under excitation of UV lamp,
SEM of the Eu:Y2(MoO4)3 and Eu:Y2(MoO4)3@Si Microwave and Eu-
es has become more important through the :Y2(MoO4)3@Si Stöber and emission spectra of the Y2(MoO4)3.
development of commercial diagnostic kits.
As main feature, these rare earths can show
a long lifetime, photostability and emission Europium γetha- diketonate complexes
bands of atomic like behavior and well defined, with tetracycline (TC), fluoxetine (FL)
in the visible region, demonstrating unique and piroxican (PX) as ancillary ligands.
advantages when compared to other lumines- bIoloGIC and solar convention application