PROCESS FOR THE PREPARATION OF A COLLOIDAL SOLUTION OF NANOPARTICLES OF A VANADIUM AND EUROPIUM MIXED OXIDE OR A MIXED OXIDE OF VANADIUM, EUROPIUM AND YTTRIUM, AND USES THEREOF

摘要

The invention relates to a process for preparing a colloidal solution S2 of nanoparticles of a mixed oxide of formula YxEu1-xVO4 in which x is such that 0 ≤ x 1, which comprises: a) the formation of a S1 colloidal solution by reaction, in an aqueous or aqueous-alcoholic medium, of a precursor P1 of vanadium oxide with a precursor P2 of europium oxide if x = 0, or with a precursor P2 of oxide of europium and a precursor P3 of yttrium oxide if x ≠ 0, the reaction being obtained by fractional addition of P2 or P2 and P3 to a solution comprising P1, or by fractional addition of P1 to a solution comprising P2 or P2 and P3; and b) curing the colloidal solution S1 formed in step a); and which is characterized in that: 1 °) step a) comprises a regulation of the pH of the medium in which the precursors of metal oxides react with each other; and in that 2 °) step b) comprises heating the colloidal solution S1 in a microwave oven. The invention also relates to the uses of the colloidal solution thus obtained. Applications: detection by a fluorescence optical sensor of target molecules present in a gaseous or liquid medium, in particular peroxides such as hydrogen peroxide.