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Permeation of a Single-Layer SiO2 Membrane and Chemistry in Confined Space

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Emmez,  Emre
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Yang,  Bing
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Shaikhutdinov,  Shamil K.
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Emmez, E., Yang, B., Shaikhutdinov, S. K., & Freund, H.-J. (2014). Permeation of a Single-Layer SiO2 Membrane and Chemistry in Confined Space. The Journal of Physical Chemistry C, 118(50), 29034-29042. doi:10.1021/jp503253a.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-DB16-A
Abstract
Well-ordered, ultrathin silica films grown on metal substrates are composed of layers of corner-sharing [SiO4] tetrahedra (silicatene). Yet unrealized in practice as unsupported material, the double-layer silicatene could constitute the thinnest silica membrane ever fabricated. We addressed here the permeability of such a membrane by using a metal substrate as a gas detector. Permeation of CO and D2 was examined by infrared reflection absorption spectroscopy and temperature-programmed desorption. The results reveal a complex response of such systems upon gas exposures which involves gas transport through amorphous silica pores as well as chemisorption and diffusion across the metal surface underneath the silicatene. Such a hybrid system, which would combine a robust molecular-sieve membrane and a chemically active metal underneath, could become interesting materials for technological applications, in particular, in catalysis and sensors