Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 373, Issue -, Pages 94-101Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2011.11.074
Keywords
Fluorescent chemosensor; beta-Dicarbonyl aggregation; Supramolecular complex; Polymer thin film; Ammonia sensing
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Funding
- ITF Hong Kong [ITS/186/09]
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Novel fluorescent poly(2-(acetoacetoxy)ethyl methacrylate)(PAAEMA) latexes have been synthesized by miniemulsion polymerization employing a polymeric costabilizer. Nanoscale aggregates of macromolecules bearing beta-dicarbonyl are formed in the prepared latex particles. Ammonia and the beta-dicarbonyl aggregates assemble a supramolecular complex, which exhibits strong visible fluorescence under UV light. The formation of the complex is confirmed by the characteristic absorption peak located at about 275 nm in UV-Vis spectra. The absorption spectrum has been found to be applicable for ammonia detection. Atomic Force Microscopy (AFM) studies of surface morphology reveal that gas-sensing properties of the PAAEMA thin films involve the reversible absorption and desorption of ammonia. PAAEMA thin films are sensitive to ammonia gas and have a short response time of 80 s when exposed to 54 ppm of ammonia gas concentration. (C) 2011 Elsevier Inc. All rights reserved.
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