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Ion irradiation induced reduction of Fe$^{3+}$ to Fe$^{2+}$ and Fe$^0$ in triethoxysilane films

Abstract : Silica gel films prepared from mixtures of triethoxysilane (TH) and Fe nitrate Fe(NO)3·9H2O were irradiated with various fluences of 3 MeV Au ions. Silicon 2p x-ray absorption (XAS) and L2,3 x-ray emission spectra of irradiated TH:Fe films are found to be very similar to those of SiO2, providing direct evidence of the formation of a glassy matrix. Fe L2,3 XAS shows the reduction of Fe3+ ions at low fluence, initially attributed to the formation of Fe metallic nanoparticles. Mössbauer spectra of films irradiated with higher ion fluences are well fitted by a singlet associated with superparamagnetic Fe particles and a doublet associated with Fe2+ ions in Fe–Si–O complexes.
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Submitted on : Friday, January 6, 2006 - 11:42:14 AM
Last modification on : Wednesday, September 16, 2020 - 4:17:35 PM

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R.G. Wilks, E.Z. Kurmaev, J.C. Pivin, A. Hunt, M.V. Yablonskikh, et al.. Ion irradiation induced reduction of Fe$^{3+}$ to Fe$^{2+}$ and Fe$^0$ in triethoxysilane films. Journal of Physics: Condensed Matter, IOP Publishing, 2005, 17, pp.7023-7028. ⟨10.1088/0953-8984/17/43/019⟩. ⟨in2p3-00025314⟩

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