Pulsed laser reshaping and fragmentation of upconversion nanoparticles - from hexagonal prisms to 1D nanorods through "Medusa" -like structures
upconversion nanoparticles, fluoride crystals, upconversion nanorods, one-dimensional (1D) structures, laser-induced reshaping
One dimensional (1D) nanostructures attract considerable attention, enabling a broad application owing to their unique properties. However, the precise mechanism of 1D morphology attainment remains a matter of debate. In this study, ultrafast picosecond (ps) laser-induced treatment on upconversion nanoparticles (UCNPs) is offered as a tool for 1D-nanostructures formation. Fragmentation, reshaping through recrystallization process and bioadaptation of initially hydrophobic (β-Na1.5Y1.5F6: Yb3+, Tm3+/β-Na1.5Y1.5F6) core/shell nanoparticles by means of one-step laser treatment in water are demonstrated. "True" 1D nanostructures through "Medusa" -like structures can be obtained, maintaining anti-Stokes luminescence functionalities. A matter of the one-dimensional UCNPs based on direction of energy migration processes is debated. The proposed laser treatment approach is suitable for fast UCNP surface modification and nano-to-nano transformation, that open unique opportunities to expand UCNP applications in industry and biomedicine.
Tsinghua University Press
Laszlo Sajti, Denis N. Karimov, Vasilina V. Rocheva, Nataliya A. Arkharova, Kirill V. Khaydukov, Oleg I. Lebedev, Alexey E. Voloshin, Alla N. Generalova, Boris N. Chichkov, Evgeny V. Khaydukov. Pulsed laser reshaping and fragmentation of upconversion nanoparticles - from hexagonal prisms to 1D nanorods through "Medusa" -like structures. Nano Research 2021, 14(4): 1141-1148.