X-ray scattering study of thermal nanopore templating in hybrid films of organosilicate precursor and reactive four-armed porogen.
Nanotechnology
; 17(14): 3490-8, 2006 Jul 28.
Article
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| MEDLINE
| ID: mdl-19661594
ABSTRACT
The miscibility and the mechanism for thermal nanopore templating in films prepared from spin-coating and subsequent drying of homogenous solutions of curable polymethylsilsesquioxane dielectric precursor and thermally labile, reactive triethoxysilyl-terminated four-armed poly(epsilon-caprolactone) porogen were investigated in detail by in situ two-dimensional grazing incidence small-angle x-ray scattering analysis. The dielectric precursor and porogen components in the film were fully miscible. On heating, limited aggregations of the porogen, however, took place in only a small temperature range of 100-140 degrees C as a result of phase separation induced by the competition of the curing and hybridization reactions of the dielectric precursor and porogen; higher porogen loading resulted in relatively large porogen aggregates and a greater size distribution. The developed porogen aggregates underwent thermal firing above 300 degrees C without further growth and movement, and ultimately left their individual footprints in the film as spherical nanopores.
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MEDLINE
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Nanotechnology
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2006
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Article