Electrostatic self-assembly of polydiacetylene nanocrystals: Nonlinear optical properties and chain orientation

Jin An He, Ke Yang, Jayant Kumar, Sukant K. Tripathy, Lynne A. Sanuielson, Toshiyuki Oshikiri, Hideyuki Katagi, Hitoshi Kasai, Shuji Okada, Hidetoshi Oikawa, Hachiro Nakanashi

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)11050-11056
Number of pages7
JournalJournal of Physical Chemistry B
Issue number50
Publication statusPublished - 1999 Dec 16
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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