Resumo

DIAZ, CARLOS; VALENZUELA, MARÍA LUISA; CARRIEDO, GABINO  e  YUTRONIC, NICOLAS. SOLID STATE SYNTHESIS OF MICRO AND NANOSTRUCTURED METAL OXIDES USING ORGANOMETALLIC-POLYMERS PRECURSORS. J. Chil. Chem. Soc. [online]. 2014, vol.59, n.2, pp.2437-2441. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072014000200008.

The organometallic derivatives of poly(styrene-co-4vinylpyridine), PS-co-4-PVP, of the general formula: {[CH₂CH(C₆H_J)]_0.1[CH₂CH(C₅H₄N•ML_n)]_0.9}_n; ML_n = W(CO)₅ , (1), CpRu(PPh₃)₂ (2), CpFe(dppe) (3), Cp₂TiCl (4) and CH₃-C₅H₄-Mn(CO)₂ (5) were prepared from the respective organometallic and the ' co-polymer {[CH₂CH(C₆H₅)]_0.1[CH₂CH(C₅H₄N]_0.9}_n. The solid state pyrolysis of these derivatives under air and at 800 °C give rise to micro and nanostructured powder metal oxides WO₃, RuO₂, TiO₂ Mn₂O₃ and the iron (III) phosphate (FePO₄) in the case of the iron precursor. The pyrolytic products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive X-ray scattering (EDX) and infrared spectroscopy (IR). From the TG (thermal gravimetric) and DSC (differential scanning calorimetry) data a possible mechanism for the formation of the solid nanostructured materials is discussed. The method appears to be a reliable and general way to obtain nanostructured metal oxide in solid-state which could be potentially and easily incorporated in solid-state electronics, catalysts and sensor devices.

Palavras-chave : Micro and nanostructured materials; metal oxide; solid-state; nanoparticles.

        · texto em Inglês     · Inglês ( pdf )