Title page for ETD etd-05112006-154831
|Type of Document
||Characterization and patterned polymer films from a novel self-assembly process
|Schick, G. Alan
|Anderson, Mark R.
|Desu, Seshu B.
|Schug, John C.
|Wightman, James P.
- Organic Thin Films
|Date of Defense
The layer-by-layer molecular-level manipulation of ionic polymer have been
utilized to fabricate ultrathin multilayer films (SAMp). In this process, monolayers of
polycations and polyanions are sequentially adsorbed onto a substrate surface by
alternately dipping the substrate into aqueous solutions of poly(vinylamine) backbone azo
(PDYE), poly(sodium 4-styrenesulfonate) (PSS), and poly(al1ylamine hydrochloride)
(PAH). The ionic attractions developed between the oppositely charged polymers promote
strong interlayer adhesion and a uniform and linear multilayer deposition process. UV Vis
absorbance, contact angle, and ellipsometry measurements revealed that in all cases the
bilayer deposition process was linear and highly producible from layer to layer and film
thickness of up to 1 µm can be easily obtained by repeating the deposition process. The
typical thickness of bilayer film depend on the solution concentration. Contact angle and
UV Vis spectroscopy measurements demonstrated that the deposition time for a full
monolayer coverage of azo dye and PAH was about 20 seconds. Our results showed that
the mechanical stability of these SAMp films was remarkable, and SAMp films can only be
removed from the substrate by scraping. SAMp films are stable in the common organic
solvents and even in the high acidic media (6M Hel aqueous solution). The conformation
of these films are thermlly stable at high temperature.
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