A highly flexible polymerization technique to prepare fluorescent nanospheres for trace ammonia detection |
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| Authors: | K Waich M Sandholzer T Mayr C Slugovc and I Klimant |
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| Institution: | (1) Institute of Analytical Chemistry and Radiochemistry, Graz University of Technology, Technikerstr. 4, 8010 Graz, Austria;(2) Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrg. 16, 8010 Graz, Austria; |
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| Abstract: | The preparation of pH-sensitive nanospheres by emulsion polymerization for the detection of trace levels of ammonia is described.
A fluorescent, polymerizable xanthene dye was copolymerized with styrene, crosslinkers and further copolymers aimed at enhancing
the sensitivity to obtain materials for sensing of ammonia. A half-seeded technique was used to obtain stable emulsions of
the monomers which were cured to obtain nanospheres with covalently attached active components. The nanospheres were embedded
in a silicon matrix and the sensor films obtained were investigated regarding their response to ammonia at concentrations
between 25 and 1,000 ppb. Sensors containing polystyrene nanospheres crosslinked with divinylbenzene showed the best performance
in ammonia measurements exhibiting detection limits (LODs) of less than 25 ppb ammonia. |
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