[Ru(0)]@SiO2 and [RuO2]@SiO2 hybrid nanomaterials are produced following a facile method consisting of the synthesis of size-controlled ruthenium nanoparticles as elemental bricks. This route takes advantage of the organometallic approach and the use of a bifunctional ligand for the synthesis of ruthenium nanoparticles from [Ru(COD)(CC (COD = 1,3-cyclooctadiene, COT = 1,3,5-cyclooctatriene) as metal precursor and (PhCH2)(2)N(CH2)(11)O(CH2)(3)Si(OEt)(3) (benzenemethanamin) as stabilizer. Hydrolysis and polycondensation steps via a sol-gel approach lead to the formation of the silica materials containing the metal nanoparticles. A final calcination step in air at 400 degrees C yields the [RuO2]@SiO2, nanoparticles. Such hybrid nanomaterials display a good dispersion of the inside the silica matrix and interesting porosity properties m attractive materials for catalytic applications. This is shown [RuO2]@SiO2 hybrid nanomaterials as catalytic filters for gas sensors.