New Synthetic Method of MgF₂ Hollow Nanoparticles by Fluorination of Raw Material Particle Surfaces　—Toward Low-temperature Mass Synthesis—

Abstract

We conducted research aimed at developing a novel method for synthesis of MgF₂ hollow nanoparticles that is simpler than the conventional synthetic method. First, Mg(OH)₂ raw material nanoparticles were contact with hydrofluoric acid vapor in a gas-solid reactor at 473 K. As a result, the surfaces of the Mg(OH)₂ nanoparticles were fluorinated to obtain Mg(OH)₂-MgF₂ core-shell particles. Next, the MgF₂ hollow nanoparticles were synthesized by soaking the core-shell particles in 1.0 mol/L hydrochloric acid to dissolve only the Mg(OH)₂ core portion. We have succeeded in developing a method for synthesizing MgF₂ hollow nanoparticles with different MgF₂ shell thicknesses by controlling the surface fluorination reaction period of Mg(OH)₂ raw material nanoparticles.