Photorefractivity in a polymeric composite photosensitized with NiS nanocrystals

Journal Article · Tue Oct 21 00:00:00 EDT 2008 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.2993253· OSTI ID:21254776

Fears, Tyler M; Anderson, Charles; Winiarz, Jeffrey G ^[1]

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1. Nanophotonic Materials Research Group, Missouri University of Science and Technology, Rolla, Missouri 65409 (United States)

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 {approx}70 to {approx}50 V/{mu}m without affecting the maximum diffraction efficiency of {approx}40%. An increase in the two-beam-coupling gain coefficient was similarly observed, increasing from 38 to 79 cm{sup -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.

• OSTI ID: 21254776
• Journal Information: Journal of Chemical Physics, Vol. 129, Issue 15; Other Information: DOI: 10.1063/1.2993253; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
CHEMICAL ANALYSIS
DIFFRACTION
ION EXCHANGE
NANOSTRUCTURES
NICKEL SULFIDES
PERFORMANCE
PHOTOCONDUCTIVITY
POLYMERS
QUANTUM EFFICIENCY
TRANSMISSION ELECTRON MICROSCOPY
VISIBLE SPECTRA
X RADIATION
X-RAY SPECTROSCOPY