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Issue 38, 2010
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Synthesis of mesoporous Si1−xGexO2 (0.10 ≤ x ≤ 0.31) using a nonionic block copolymer template

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Abstract

We have successfully synthesized mesoporous silica-germania mixed oxide (Si1−xGexO2) with x up to 0.31 by controlling the reaction to delay hydrolysis and condensation until the precursors have sufficiently ordered around the nonionic templating agent. Small-angle X-ray diffraction (SAXS) and transmission electron microscopy (TEM) reveal disordered worm-like mesopores for all germanium concentrations investigated, with pore periodicities of 9.8 and 10.5 nm for x ≈ 0.10 and 0.20 respectively. We confirm that the germanium and silicon are homogenous on the nanoscale using scanning transmission electron microscopy (STEM) with energy dispersive X-ray (EDX) mapping. Attempts to convert the mixed mesoporous oxides to mesoporous Si1−xGex alloys via magnesiothermic reduction resulted in phase segregation.

Graphical abstract: Synthesis of mesoporous Si1−xGexO2 (0.10 ≤ x ≤ 0.31) using a nonionic block copolymer template

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Publication details

The article was received on 29 Jun 2010, accepted on 29 Jul 2010 and first published on 27 Aug 2010


Article type: Paper
DOI: 10.1039/C0JM02057E
Citation: J. Mater. Chem., 2010,20, 8389-8393
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    Synthesis of mesoporous Si1−xGexO2 (0.10 ≤ x ≤ 0.31) using a nonionic block copolymer template

    J. R. Szczech, M. A. Lukowski and S. Jin, J. Mater. Chem., 2010, 20, 8389
    DOI: 10.1039/C0JM02057E

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