Novel Highly Charged Silica-Coated Tb(III) Nanoparticles with Fluorescent Properties Sensitive to Ion Exchange and Energy Transfer Processes in Aqueous Dispersions

Abstract

Novel silica-coated Tb(III) nanoparticles with high luminecsence were synthesized using the reverse microemulsion procedure. The quenching of luminescent properties of these nanoparticles can be achieved by ion exchange and energy transfer mechanisms. The quenching through the ion exchange of Tb(III) by H+ or La(III) is time dependent, indicating that the ion exchange is probably diffusion controlled. The quenching by Co(III) complex cations is achieved by the energy transfer mechanism and thus is not time dependent. The analysis of quenching data in Stern-Volmer cooordinates reveal the negative charge of the silica-coated Tb(III)-TCAS nanoparticles and several types of luminophoric species, located within the core and close to the surface of silica nanoparticles.

Temperature induced phase separation of luminescent silica nanoparticles in Triton X-100 solutions

“…Synthesis of silica and silica coated Tb-TCAS nanoparticles has been performed according to reverse microemulsion procedure presented in the work [29].…”

Silica nanoparticles with a substrate switchable luminescence

“…Synthesis of such silica nanoparticles has been performed according to reverse microemulsion procedure presented in the work [10]. Synthesis of silica coated Yb(III) and Yb(III)-Ru(II) nanoparticles at various Yb:Ru molar ratio has been performed with the addition to the reaction mixture of 7.…”

“…The nanoparticles were prepaired according to the known procedure by hydrolysis of TEOS with ammonium hydroxide in a W/O microemulsion [10], containing terbium(III) and ytterbium(III) complexes with p-sulphonatotiacalix [4]arene (Tb(III)-TCAS, Yb(III)-TCAS). The lanthanides complexes doped silica nanoparticles were characterized by transmission electron microscopy (TEM).…”

“…Indeed the terbium luminescence of Tb(III)-TCAS doped silica nanoparticles is switched off when cobalt(III) complexes are adsorbed by their surface. More detailed description of these quenching measurements is presented in our previous work [10]. Herein we represent our efforts to develop the luminescent nanoparticles with sensor function using [Co(dipy) 3 …”

The effect of the core morphology of Eu(III)-doped nanoparticles on the ion exchange versus energy transfer between Eu(III) in the core and Cu(II) ions at the interface

“…The coating of lanthanide complexes by silica or polymeric shell is the common way to prevent their degradation in solutions and bioenvironment (Enrichi et al 2010;Gao et al 2009;Jiang et al 2010;Binnemans et al 2004;Wu et al 2008;Härmä et al 2008;Yin et al 2011;Mustafina et al 2009Mustafina et al , 2011. The insertion of various f or both d and f ions into silica nanoparticles should be mentioned as fine examples of gaining to NPs dual luminescence or luminescent and magnetic properties (Fedorenko et al 2010;Shi et al 2010).…”