Luminescent lanthanide-ion doped nanoparticles as singlebiomolecule labels and oxidant sensors

Didier Casanova (1) , Domitile Giaume (2) , M. Moreau (2) , Thierry Gacoin (2) , Jean-Pierre Boilot (2) , Antigoni Alexandrou (1)

1 LOB - Laboratoire d'optique et biosciences
2 LPMC - Laboratoire de physique de la matière condensée

We report on the single-particle properties of lanthanide-ion doped oxide nanoparticles. We have demonstrated that their size can be accurately determined from their luminosity. The optically determined size distribution is in very good agreement with the distribution obtained from transmission electron microscopy (TEM). We also showed that the photobleaching of these nanoparticles is related to a reduction process and that we can use it to sense in a concentration-dependent manner the presence of an oxidant like H 2O2. Finally, we propose a way to perform nanoparticle-protein coupling and to determine the protein-nanoparticle ratio at the single-particle level. © (2007) COPYRIGHT SPIE--The International Society for Optical Engineering.

Didier Casanova, Domitile Giaume, M. Moreau, Thierry Gacoin, Jean-Pierre Boilot, et al.. Luminescent lanthanide-ion doped nanoparticles as singlebiomolecule labels and oxidant sensors. Colloidal Quantum Dots for Biomedical Applications II, Jan 2007, San Jose, CA, United States. ⟨10.1117/12.705067⟩. ⟨hal-00841057⟩