Structure and Adsorption Properties of Nanocrystalline Silicon |
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| Authors: | I A Tutorskii A I Belogorokhov A A Ishchenko P A Storozhenko |
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| Institution: | (1) Moscow State Academy of Fine Chemical Technology, pr. Vernadskogo 86, Moscow, 119571, Russia;(2) TNTs RF Giredmet, Bol’shoi Tolmachevskii per. 5, Moscow, 119017, Russia;(3) GNTs RF FGUP State Research Institute of Chemistry and Technology of Organoelement Compounds, sh. Entuziastov 20, Moscow, 111123, Russia |
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| Abstract: | The structure of the particles of nanocrystalline silicon synthesized in argon plasma with added oxygen is studied. An amorphous shell composed of silicon oxide is formed on the surface of silicon nanoparticles. The particles form clusters with a fractal structure. The adsorption of nitrogen on a powder of nanocrystalline silicon at 77 K is studied, and adsorption isotherms obtained for nanocrystalline silicon and nonporous silica adsorbents with identical specific surface areas are compared. The values of surface fractal dimension of powdered nanocrystalline silicon are calculated using the Frenkel-Halsey-Hill equation for multilayer adsorption under the dominant contribution of van der Waals or capillary forces. It is shown that surface fractal dimension is a structure-sensitive parameter characterizing both the morphology of clusters and the structure (roughness) of the surface of particles and their aggregates.__________Translated from Kolloidnyi Zhurnal, Vol. 67, No. 4, 2005, pp. 541–547.Original Russian Text Copyright © 2005 by Tutorskii, Belogorokhov, Ishchenko, Storozhenko. |
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