Development of Metal−SiO₂ Nanocomposites in a Single-Step Process by the Polymerizable Complex Method

Abstract

This work presents the synthesis and characterization of SiO 2 :metal (Ni, Co, Ag, and Fe) nanocomposites processed by the polymerizable complex method. The polymeric precursor solutions obtained were characterized by means of FT-Raman and 13 C NMR spectroscopy. The results show the formation of a hybrid polymer with carbon and silicon in the macromolecule chain and the transition metal cation arrested within this polymeric chain. The nanocomposites are formed during the controlled polymeric precursor pyrolysis. The reduction of the metal cation is promoted by the CO/CO 2 atmosphere resulting from the pyrolysis of the organic material. Microstructural characterization, performed by TEM and X-ray diffraction (XRD), showed that the nanocomposites are formed by metal nanoparticles embedded in a amorphous matrix formed by SiO 2 and carbon. In the SiO 2 :Fe system, Fe 3 C was also detected by XRD.

Synthesis and Characterization of Cyclotriphosphazenes Containing Silicon as Single Solid-State Precursors for the Formation of Silicon/Phosphorus Nanostructured Materials

“…In fact, the exothermal peaks at 250°C and 300°C can be assigned to the carbonization of the organic matter. Similar exothermic peaks have been observed during the oxidation of organometallic complexes [36][37][38] .…”

Layered Graphitic Carbon Host Formation during Liquid-free Solid State Growth of Metal Pyrophosphates

“…There are many known methods for preparing metallic nanostructures, and solution-based methods have been the most prevalent, owing to the relatively simple chemistries involved in reducing metallic salts in appropriate solvents [15][16][17] . By comparison, relatively few solid-state strategies for pure metallic nanostructured materials have been reported [18][19][20][21][22] . In recent work [23][24][25][26][27][28][29] , we reported a new solid-state method allowing the formation of metallic (M), oxidic (M x O y ) and (pyro)phosphate-based (M x P y O z ) nanostructured materials without necessitating liquids or solutions.…”

Organometallic Derivatives of Cyclotriphosphazene as Precursors of Nanostructured Metallic Materials: A New Solid State Method

“…Steric stabilization can be achieved by ligands, polymers, oligomers or solvents. However, few solid state methods for preparing metallic nanoparticles have been reported [7][8][9][10][11] and almost all of them involve gold nanoparticles [8,9].…”