Incorporation into paper of cellulose triacetate films containing semiconductor nanoparticles |
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Authors: | Tiffany Abitbol Derek G Gray |
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Institution: | (1) Department of Chemistry, McGill University, Pulp and Paper Building, 3420 University Street, Montreal, QC, Canada, H3A 2A7 |
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Abstract: | CdSe/ZnS quantum dots (QDs) were embedded in films of cellulose triacetate (CTA) to give clear films with the broad absorbance
and well-defined, size-tunable fluorescence characteristic of QDs. The relative quantum yields of the QDs in polymer were
compared to that of the initial QDs dispersed in toluene. Alkaline hydrolysis of the film surfaces to regenerated cellulose
rendered the previously hydrophobic CTA film surfaces hydrophilic and compatible with aqueous papermaking. Films containing
combinations of different sized QDs gave more complex emission patterns. Small pieces of fluorescent films were added to pulp
slurries and incorporated into laboratory paper sheets through hydrogen bonding between the regenerated cellulose film surfaces
and cellulosic pulp fibers. The film system (cellulose ester bulk/cellulose surface) can be used to incorporate hydrophobic
particles or molecules compatible with solutions of cellulosic polymers into paper products at both high and low loadings.
QDs in paper may prove useful for security applications, such as sheets with unique optical signatures. |
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Keywords: | Cellulose triacetate CdSe/ZnS quantum dots Fluorescence Paper |
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