The effect of cyanine dyes on photorefractive properties of composites based on carbon nanotubes
| Autor: | V. V. Savel’ev, T. V. Krivenko, A. D. Grishina, Rodney Rychwalski, Anatoly V. Vannikov, A. S. Laryushkin |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Carbazole Organic Chemistry Metals and Alloys Photorefractive effect Carbon nanotube Dielectric Photoelectric effect Photochemistry Laser Surfaces Coatings and Films law.invention chemistry.chemical_compound chemistry law Materials Chemistry Quantum efficiency Cyanine Composite material |
| Zdroj: | Protection of Metals and Physical Chemistry of Surfaces. 48:191-198 |
| ISSN: | 2070-206X 2070-2051 |
| DOI: | 10.1134/s2070205112020104 |
| Popis: | Photorefractive, nonlinear optical, and photoelectric characteristics at 1064 nm are discussed in the case of composites of polyvinyl carbazole (PVC) and closed single-walled carbon nanotubes with an additive of a visible-range cyanine dye with high electron affinity. Photorefractive properties are due to carbon nanotubes that are simultaneously spectral sensitizers toward laser irradiation at 1064 nm and responsible for the third-order dielectric susceptibility. Introduction of the dye leads to an increase in the photorefractive two-beam amplification factor of the laser bean and a significant increase in the quantum efficiency of free hole formation in PVC, but also a decrease in the third-order susceptibility. The dye plays the role of a super-sensitizer. It probably limits charge recombination in geminal pairs photogenerated in the range of bright interference fringes. |
| Databáze: | OpenAIRE |
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