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Effects of poly-N-isopropylacrylamide on fluorescence properties of CdS/Cd(OH)2 nanoparticles in water

Paper ID Volume ID Publish Year Pages File Format Full-Text
28213 44065 2009 6 PDF Available
Title
Effects of poly-N-isopropylacrylamide on fluorescence properties of CdS/Cd(OH)2 nanoparticles in water
Abstract

Effects of poly-N-isopropylacrylamide (polyNIPAM) on the fluorescence properties of core/shell type CdS/Cd(OH)2 nanoparticles (NPs) have been studied in water. The NPs show strong fluorescence at low temperature, but the intensity decreases at >32 °C, allowing an on–off fluorescence switching by temperature. The heat-induced fluorescence quenching is due to the phase transition of polyNIPAM from coil to globule state. The NPs in solution associate with polyNIPAM via a hydrogen bonding interaction. Upon heating the solution, the NPs are confined within the polymer matrices during polymer aggregation. The aggregated polymer suppresses the incident absorption of inner NPs, resulting in fluorescence quenching. A notable feature obtained by the polyNIPAM addition is the enhanced thermal stability of NPs. The NPs confined within the polymer matrices are separated from each other. This therefore suppresses the coalescence of NPs, resulting in high stability even at high temperature.

Keywords
Semiconductor nanoparticles; Poly-N-isopropylacrylamide; Temperature; Fluorescence; Phase transition
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Effects of poly-N-isopropylacrylamide on fluorescence properties of CdS/Cd(OH)2 nanoparticles in water
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 205, Issue 1, 10 June 2009, Pages 51–56
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us