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Abrupt Interfacial Transitions of Hydrophobic Polysilanes As Probed via Liquid Crystal-Assisted Stepwise Deposition

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journal contribution
posted on 16.02.2002, 00:00 by Shusaku Nagano, Takahiro Seki
The Langmuir−Blodgett deposition was applied for the first time for fully hydrophobic polysilanes, poly(di-n-hexylsilane) (PDHS) and poly(methyl-n-octylsilane) (PMOS). The monolayer formation of such hydrophobic polysilanes was achieved by cospreading with a liquid crystal molecule, 4‘-pentyl-4-cyanobiphenyl (5CB). The UV−visible absorption spectra showed that the backbone conformations of the polysilanes are completely different from that in the bulk. The layer-by-layer deposition allowed for the nanometer level evaluation of the thickness profile on the conformational changes. It is found that the conformational change of these hydrophobic polysilanes abruptly occurs at a monolayer level thickness boundary.