Efficient, thermally stable, second order nonlinear optical response in organic hybrid covalent/ionic self-assembled films

James R. Heflin, Matthew T. Guzy, Patrick J. Neyman, Kylie J. Gaskins, Charles Brands, Zhiyong Wang, Harry W. Gibson, Richey M. Davis, Kevin Van Cott

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

A covalent/electrostatic layer-by-layer self-assembly method was used to achieve polar ordering of a water soluble, reactive dye in the fabrication of nonlinear optical (NLO) films. We observed a quadratic relationship between the second harmonic intensity I and bilayer number for all films made with Procion Brown MX-GRN, demonstrating that the polar ordering of the chromophores is consistent in each successive bilayer. As the ionic strength of the dye deposition solution was increased to 0.5 M NaCl, the x zzz (2) of the films increased by approximately 250% to 50 × 10 -9 esu, with a corresponding average chromophore tilt angle of 38°. This was attributed to increased shielding of the dye charges which led to higher chromophore density in the bilayers. The electrooptic coefficient for films of 50 bilayers fabricated at 0.5 M NaCl was 14 ±2 pm/V. Importantly, these films exhibited excellent thermal stability, with only a 10% decrease in (I ) 1/2 after 36 h at 85 °C and then 24 h at 150 °C. Furthermore, the (I ) 1/2recovered completely upon cooling to room temperature. These results with a commodity textile dye point to the potential value of this class of reactive chromophores and this self-assembly method for fabrication of electrooptic materials at ambient conditions from aqueous solutions.

Original languageEnglish (US)
Pages (from-to)5723-5727
Number of pages5
JournalLangmuir
Volume22
Issue number13
DOIs
StatePublished - Jun 20 2006

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Chromophores
Coloring Agents
Dyes
chromophores
dyes
Electrooptical effects
Self assembly
electro-optics
self assembly
Optical films
Fabrication
commodities
Ionic strength
fabrication
Shielding
textiles
Electrostatics
Textiles
Thermodynamic stability
shielding

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Efficient, thermally stable, second order nonlinear optical response in organic hybrid covalent/ionic self-assembled films. / Heflin, James R.; Guzy, Matthew T.; Neyman, Patrick J.; Gaskins, Kylie J.; Brands, Charles; Wang, Zhiyong; Gibson, Harry W.; Davis, Richey M.; Van Cott, Kevin.

In: Langmuir, Vol. 22, No. 13, 20.06.2006, p. 5723-5727.

Research output: Contribution to journalArticle

Heflin, JR, Guzy, MT, Neyman, PJ, Gaskins, KJ, Brands, C, Wang, Z, Gibson, HW, Davis, RM & Van Cott, K 2006, 'Efficient, thermally stable, second order nonlinear optical response in organic hybrid covalent/ionic self-assembled films', Langmuir, vol. 22, no. 13, pp. 5723-5727. https://doi.org/10.1021/la0602970
Heflin, James R. ; Guzy, Matthew T. ; Neyman, Patrick J. ; Gaskins, Kylie J. ; Brands, Charles ; Wang, Zhiyong ; Gibson, Harry W. ; Davis, Richey M. ; Van Cott, Kevin. / Efficient, thermally stable, second order nonlinear optical response in organic hybrid covalent/ionic self-assembled films. In: Langmuir. 2006 ; Vol. 22, No. 13. pp. 5723-5727.
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