Nano metal fluorides: small particles with great properties

Abstract

The recently developed fluorolytic sol–gel route to metal fluorides opens a very broad range of both scientific and technical applications of the accessible high surface area metal fluorides, many of which have already been applied or tested. Specific chemical properties such as high Lewis acidity and physical properties such as high surface area, mesoporosity and nanosize as well as the possibility to apply metal fluorides on surfaces via a non-aqueous sol make the fluorolytic synthesis route a very versatile one. The scope of its scientific and technical use and the state of the art are presented.

Cation-Ligand Complexation Mediates the Temporal Evolution of Colloidal Fluoride Nanocrystals through Transient Aggregation

“…Because of their unique physical, chemical, and electronic properties, colloidal inorganic fluoride nanocrystals (NCs), namely, nanofluorides, have found applications over the last two decades as functional materials in a variety of fields, including photonics, bioimaging, biomedicine, sensing, catalysis, and more. A case in point are colloidal CaF 2 , which were developed for upconversion fluorescence, time-resolved luminescent, antifungal coating, in vivo magnetic resonance imaging (MRI), − prodrug activation, photodynamic therapy, remineralization of dental caries, and in situ NMR studies .…”

The Correlation Between Crystal Phase and Acidity in Nickel Doped Zinc Fluoride Solid

“…Solid metal fluoride as a material that can play a role in various fields, one of which is catalyst [1]. When compared with metal oxides, metal fluorides have a more dominant level of surface acidity [2]. Several methods have been used in the synthesis of solid metal fluorides.…”

“…Several methods have been used in the synthesis of solid metal fluorides. Fluorolytic sol gel is a method that is in great demand because it produces products with high homogeneity at low temperature and requires low cost [3] [4]. An example of a solid metal fluoride synthesized by the sol-gel method is ZnF2 [5].…”

Manganese Fluoride Nanoparticles Synthesized by Microwave Irradiation Using Ionic Liquid–Ethylene Glycol Mixtures: Room-Temperature Photoluminescence, Crystalline Phase, and Morphology

“…Metal fluorides are suitable materials for storage, transmission, and transferring of optical energy due to their strong ionic bonding, large band gap, and lower phonon energy. , Among them, MnF 2 has attracted the attention in the fields of photonics and spintronics due to its magnetic properties and optical properties of Mn 2+ such as photoluminescence (PL), electroluminescence, and magneto-optic effects. − The pressure-induced structural behavior of MnF 2 has been extensively studied both theoretically and experimentally. − As the cation–anion radius ratio MnF 2 (0.63) is close to the upper limit (0.732) for a stable rutile structure, phase transition of MnF 2 can occur at lower pressures than other transition metal fluorides. , It has been reported that these structural changes in MnF 2 induced by pressure can efficiently enhance the PL efficiency reducing exciton migration among Mn 2+ . In addition, an increase of the PL-quenching temperature was reported in nanosized milled MnF 2 …”

“…14,18,21 Metal fluorides are suitable materials for storage, transmission, and transferring of optical energy due to their strong ionic bonding, large band gap, and lower phonon energy. 22,23 Among them, MnF 2 has attracted the attention in the fields of photonics and spintronics due to its magnetic properties and optical properties of Mn 2+ such as photoluminescence (PL), electroluminescence, and magneto-optic effects. 24−26 The pressure-induced structural behavior of MnF 2 has been extensively studied both theoretically and experimentally.…”