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Authors
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Hien, O. ; Komber, H. ; Voit, B. ; Krasteva, N. ; Yasuda, A. ; Vossmeyer, T.
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Title
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Hyperbranched polythioethers: preparation and use in gold nanoparticle composite sensor films
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Date
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08.06.2007
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Number
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14658
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Abstract
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Hyperbranched polythioethers were synthesized via radical mediated polyaddition reaction starting from 1,2-ethanedithiol or 1,3-propanedithiol (A) and 1-vinyloxy-2,2-bis(vinyloxymethyl)butane (B) via an A2 + B3 approach. Three types of terminal groups unreacted thiols, unreacted double bonds and cyclic structures, were identified in the final products by NMR. The presence of the cyclic structures shifted the gel point in the A2 + B3 system to higher conversions and therefore, reduced the danger of crosslinking. The nature of the end groups was controlled by the feed ratio of the A and B monomers. The formation of free thiol groups was favoured when an excess of A functionality was employed. Thiol-terminated polymers were used as organic linker molecules for preparing Au-nanoparticle/hyperbranched polythioether (AuHP) composite chemiresistor sensors via layer-by-layer self-assembly. The UV/Vis spectra of the AuHP films showed a well-resolved plasmon absorbance band at about 550 nm, which evidences the presence of isolated Au-nanoclusters in the layer. The vapour sensing properties of the AuHP chemiresistors were characterized by measuring the change in their resistance when exposed to vapours of toluene, tetrachloroethylene (TCE), 1-propanol and water. All AuHP sensors responded with fast and reversible increase in resistance upon dosing with solvent vapours. The sensitivity to analytes decreased in the order toluene > TCE > 1-propanol > water. The chemical selectivity of the sensors reflects the expected hydrophobic nature of the hyperbranched polythioether linkers.
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Publisher
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Journal of Nanostructured Polymers and Nanocomposites
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Wikidata
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Citation
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Journal of Nanostructured Polymers and Nanocomposites 2 (2007) 109-120
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DOI
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http://www.jnpn.org/03,02,03.html
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