International Summer School PROGRAM - Laboratoire d'Infochimie ...

Photophysical properties of surfactant modified luminescent Tb-doped
silica nanoparticles in presence of dyes as quenchers of Tb luminescence.
O.D. Bochkova,
A.R. Mustafina, V.V. Skripacheva, Yu.G. Elistratova, A.R.
Mukhametshina, S.E. Solovieva, A.I. Konovalov.
A.E. Arbuzov Institute of Organic and Physical Chemistry of Kazan Scientific Center
of RAS, Kazan, Russia.
Lanthanide-doped silica nanoparticles have gained a great deal of attention owing to
lanthanides unique spectroscopic characteristics, including long fluorescence lifetime,
large Stokes shift, and sharp line-like emission bands. The metal complex-doped
nanoparticles have an advantage over a single complex, since the silica shell protects the
metal complex from photodegradation, while the surface of the nanoparticle can be
functionalized by various anchoring groups. The silica surface decoration is aimed to
increase the colloidal stability of nanoparticles, as well as to develop their receptor
properties towards biotargets. The decoration of the silica surface through the noncovalent
interactions represents more convenient alternative to covalent anchoring due
to the lack of multistep purification procedures.
The approach to sense the adsorption of various surfactants onto silica surface of Tbdoped
nanoparticles will be discussed. It is based on quenching of Tb luminescence by
dyes. A universality of this approach will be shown. Regularities of change of surfactant
modified Tb-doped silica nanoparticles luminescence and quenching mechanisms of
Tb-luminescence by dye molecules will be reported. The methods of dynamic light
scattering and luminescent spectroscopy were used.
We thank RFBR
(projects N 09-03-12260
Ofi_M and 10-03-
00352-а) for financial
supporting.