Abstract

The photorefractive performance of a polymeric composite photosensitized through the inclusion of NiS nanocrystals is described. The nanocrystals were characterized using visible-absorption spectroscopy, energy-dispersive x-ray spectroscopy, and transmission electron microscopy. We further demonstrate the ability to enhance various aspects of the composite's photorefractive performance by performing ligand exchange on the nanocrystals prior to their incorporation into the polymer composite. This procedure resulted in a lowering of the overmodulation voltage from ~70 to ~50 V/µm without affecting the maximum diffraction efficiency of ~40%. An increase in the two-beam-coupling gain coefficient was similarly observed, increasing from 38 to 79 cm−1. The photoconductivities were used in determining the overall quantum efficiencies associated with the photorefractive devices. All experiments were conducted at 633 nm and the data represent a significant improvement in the photorefractive performance of inorganic-organic hybrid photorefractive materials.

Department(s)

Chemistry

Sponsor(s)

University of Missouri Research Board

Keywords and Phrases

Organic-Inorganic Hybrid Materials; Photorefractive Effect; Visible Spectra; X-Ray Chemical Analysis

Library of Congress Subject Headings

Nanostructured materials
Nickel compounds
Photoconductivity
Photorefractive materials
Polymers
Transmission electron microscopy

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2008 American Institute of Physics (AIP), All rights reserved.

Full Text Link

Included in

Chemistry Commons

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