Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 119, Issue 1-2, Pages 237-242Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2009.08.054
Keywords
Composite materials; Optical materials; Optical properties; Quantum dots
Categories
Funding
- Northrop Grumman Corporation
- Lamar University
- Dan F. Smith Department of Chemical Engineering at Lamar University
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A transparent poly (vinyl alcohol) (PVA) nanocomposite thin film (30-50 nm) reinforced with core/shell cadmium selenide (CdSe)/zinc sulfide (ZnS) quantum dots (QDs)was fabricated by a drop-casting method. A narrow peak at similar to 556 nm observed in the UV-vis spectrum indicates the uniformly dispersed QDs in the PVA matrix. Fr-IR analysis indicates the interaction between the QDs and the polymer matrix. Both PVA and PVA-QDs nanocomposite thin films show polarized light dependent absorption properties with several different absorption peaks. As compared to the only fluorescent emission peak at 574 nm of QDs, the pure PVA and PVA-DDs nanocomposites show an excitation wavelength dependent fluorescent emission property. (C) 2009 Elsevier B.V. All rights reserved.
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