Abstract
Incorporation of iron nanoparticles (FeNP) induced changes in the textural and electrical properties of SBA-15-like silica. Electron microscopy showed that FeNP dispersion occurs mainly inside the channels. Diffuse UV–Vis reflectance spectroscopy revealed a band gap decrease from 2.68eV to 2.59eV. Nyquist plots (Z″ versus Z′) were found to fit with an equivalent circuit model consisting of a resistance Rs, a double layer capacitance Q, an electron-transfer resistance Ret and a Warburg impedance Zw. FeNPs and silica deprotonation seem to be responsible of conductance change. SBA-15-Fe appears to be a promising material for electrodes and semi-conductors.
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