Enhanced Photorefractivity in a Polymeric Composite Photosensitized with Carbon Nanotubes Grafted to a Photoconductive Polymer
We report on the photosensitization of photorefractive (PR) polymeric composites through the inclusion of multiwalled and singlewalled carbon nanotubes (CNTs), respectively, having poly(N -vinyl carbazole) (PVK) grafted to their surfaces. The PR nature of the holographic gratings was confirmed via the asymmetric exchange of energy in a two-beam-coupling (TBC) geometry, yielding TBC gain coefficients approaching 80 cm-1. In addition, in degenerate-four-wave- mixing experiments the prepared composites exhibited diffraction efficiencies as high as 60% and overmodulation voltages as low as ∼40 V/μm. These notable figures of merit indicate that the grafting of the PVK polymer to the various CNTs results in enhanced PR performance. The mechanism responsible for this enhancement in PR performance is investigated using a variety of experimental techniques. © 2011 American Institute of Physics.
N. K. Lingam et al., "Enhanced Photorefractivity in a Polymeric Composite Photosensitized with Carbon Nanotubes Grafted to a Photoconductive Polymer," Journal of Applied Physics, American Institute of Physics (AIP), Jan 2011.
The definitive version is available at http://dx.doi.org/10.1063/1.3530583
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© 2011 American Institute of Physics (AIP), All rights reserved.