Influence of HSiO sol-gel polymer structure and composition on the size and luminescent properties of silicon nanocrystals
Chemistry of Materials, ISSN: 0897-4756, Vol: 21, Issue: 22, Page: 5426-5434
2009
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Article Description
We report the preparation of Si02-embedded silicon nanocrystals (Si-NCs) from the thermal processing of sol-gel polymers derived from trichlorosilane (HSiCl). Straightforward addition of water to HSiCl generates a cross-linked (HSiO) sol-gel polymer suitable for the generation of bulk quantities of SiO-embedded Si-NCs. It is shown that structural differences between the present (HSiO ) polymer and hydrogen silsesquioxane (HSQ) result in controllable differences in the resulting oxide-embedded Si-NCs produced from these precursors. A polymer structure/NC size relationship is further delineated through the preparation and evaluation of methyl-modified (HSiO )(CHSiO) (m ≪ n, m + n = 1) sol-gel copolymers, in which a low concentration of methyl groups acts as a polymer network modifier and influences the formation of Si-NCs during thermal processing. Si-NC size is readily tailored by controlled variations to peak processing temperature for (HSiOi) and composition (n and m) for (HSiO)(CH SiO)̇. Furthermore, the present Si-NCs exhibit size-dependent photoluminescence (PL) in accordance with the principles of quantum confinement. Freestanding Si-NCs are obtained through chemical etching of the oxide matrix and exhibit tunable PL throughout the visible spectrum. © 2009 American Chemical Society.
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