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• W2158664588 abstract "The encapsulation of molecular probes in a suitable nanostructured matrix can be exploited to alter their optical properties and robustness for fabricating efficient chemical sensors. Despite high sensitivity, simplicity, selectivity and cost effectiveness, the photo-destruction and photo-bleaching are the serious concerns while utilizing molecular probes. Herein we demonstrate that hydroxy pyrene trisulfonate (HPTS), a pH sensitive molecular probe, when encapsulated in a microcapsule structure prepared via the assembly of silica nanoparticles mediated by poly-L-lysine and trisodium citrate, provides a robust sensing material for pH sensing under the physiological conditions. The temporal evolution under continuous irradiation indicates that the fluorophore inside the silica microcapsule is extraordinarily photostable. The fluorescence intensity alternation at dual excitation facilitates for a ratiometic sensing of the pH, however, the fluorescence lifetime is insensitive to hydrogen ion concentration. The sensing scheme is found to be robust, fast and simple for the measurement of pH in the range 5.8-8.0, and can be successfully applied for the determination of ammonia in the concentration range 0-1.2 mM, which is important for aquatic life and the environment." @default.
• W2158664588 created "2016-06-24" @default.
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• W2158664588 date "2011-12-01" @default.
• W2158664588 modified "2023-10-01" @default.
• W2158664588 title "Nanoparticle assembled microcapsules for application as pH and ammonia sensor" @default.
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• W2158664588 doi "https://doi.org/10.1016/j.aca.2011.10.001" @default.
• W2158664588 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22093347" @default.
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