Preparation of new sensors and filters of aldehydes and / or ketones

摘要

The invention relates to a process for the preparation of a nanoporous silicate sol-gel matrix containing at least one amine reactant chosen from hydroxylamine, methylhydroxylamine, tert-butylhydroxylamine, methoxyamine and dihydrazides of dicarboxylic acids, especially dihydrazide. adipic acid, and salts thereof, said process comprising the following steps: a) synthesizing a gel from tetramethoxysilane or a mixture of tetramethoxysilane and another organosilicon precursor selected from phenyltrimethoxysilane, phenyltriethoxysilane, fluoroalkyltrimethoxysilane, a fluoroalkyltriethoxysilane, a chloroalkylmethoxysilane, a chloroalkylethoxysilane, an aminopropyltriethoxysilane and mixtures thereof, the synthesis being carried out in an aqueous medium at a temperature ranging from 10 to 70 ° C. in the presence of at least one amine reactant chosen from hydroxylamine and methylhydroxylamine, tertbutylhydroxylamine, methoxyamine, dihydrazides of dicarboxylic acids, especially adipic acid dihydrazide, and their salts; b) drying the gel obtained in step a) so as to obtain a sol-gel matrix containing at least one amino reactant.