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Multilayered Structures and Low Temperature Conversion Process of Poly(P-Phenylene Vinylene) Thin Films

Published online by Cambridge University Press:  21 March 2011

A. Marletta,
F. A. Castro,
O. N. Oliveira Jr.,
R. M. Faria and
F. E. G. Guimarães
A. Marletta
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo, C.P. 369, 13560-970, São Carlos- SP, Brazil
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Abstract

We have used a long chain dodecylbenzenesulfonate ion (DBS) to produce self-assembled multilayer structures of poly(p-phenylene vinylene) (PPV) with special features. Rather than alternating layers provided of a PPV-precursor (the poly(xylylidene tetrahydrothiophenium chloride or PTHT) and a polyanion, the alternated adsorption process was carried out with the PPV-precursor and the DBS ions in aqueous solution. The internal layer structure of these PTHT- DBS films is therefore different from conventional layer-by-layer films, since DBS is expected to be incorporated into the PTHT chain via counterion exchange. As a consequence, the conjugation length could also be controlled by controlling the DBS content in the film. Further advantage of introducing DBS lies in the possibility of converting films with a high conjugation length at 115 oC within only 3 min. The luminescence and absorption spectra at low temperatures show a very intense well-resolved vibronic structure. We also demonstrated the band-gap control of PPV films with a possible heterostructure formation.

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References

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