Two different sizes of nanocrystals of poly(1,6-dicarbazolyl-2,4-hexadiyne) (poly-DCHD), have been assembled into composite films by electrostatic self-assembly (ESA) using poly(dimethyldiallylammonium chloride) (PDAC) as the oppositely charged polyelectrolyte. UV-visible absorption showed that the film deposition process is uniform. The AFM images of these films indicate that the nanocrystals are platelets lying on the substrate plane. The chromophore (polydiacetylene backbone) orientation and third-order optical nonlinearity of poly-DCHD/PDAC multilayers are investigated by electroabsorption spectroscopy. The ratio of χ3333(3) to χ1133(3) is significantly less than 3, indicating that the polymer chains are predominantly parallel to the plane of the substrate. In addition, the films possess third-order nonlinearity in the order of 10-11 esu.
|Number of pages||7|
|Journal||Journal of Physical Chemistry B|
|Publication status||Published - 1999 Dec 16|
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry