Pulsed laser reshaping and fragmentation of upconversion nanoparticles – from hexagonal prisms to 1D nanorods through “Medusa”-like structures
Researchers from the Federal Research Center "Crystallography and Photonics" and the Institute of Bioorganic Chemistry RAS, together with colleagues from Austria, Germany and France, have developed a technology for 1D-nanostructure fabrication. One-dimensional upconversion nanocrystals (UCNPs) with unique optical properties and morphology have been prepared by the laser-induced recrystallization of nanostate. Exposure to picosecond laser irradiation of UCNPs with a core/shell structure (β-Na1.5Y1.5F6:Yb3+, Tm3+/β-Na1.5Y1.5F6) led to a controlled dynamic nanotransformation of luminescent 3D-structure into 1D with inherent optical properties through the formation of particles with unusual “medusa”-like architecture. The proposed technology based on picosecond laser treatment enables UCNP surface hydrophilization and performs the transformation from "nano" to "nano", which ensures the preparation of nanoagents for biovisualization and therapy. The research was published in the journal Nano Research.
december 30, 2020