Glucose sensitive poly (<Emphasis Type="Italic">N</Emphasis>-isopropylacrylamide) microgel based etalons |
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Authors: | Courtney?D?Sorrell Email author" target="_blank">Michael?J?SerpeEmail author |
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Institution: | (1) Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta, Canada, T6G 2G2; |
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Abstract: | Thermoresponsive microgels have been shown to be an excellent platform for designing sensor materials. Recently, poly (N-isopropylacrylamide)-co-acrylic acid (pNIPAm-co-AAc) microgel based etalon materials have been described as direct sensing materials that can be designed to have a single,
unique color. These color tunable materials show immense promise for sensing due to their spectral sensitivity and bright
visual color. Here, we describe a proof-of-concept for etalon sensing of glucose. We found that aminophenylboronic acid (APBA)-functionalized pNIPAm-co-AAc microgels in an etalon respond to 3 mg/mL glucose concentrations by red shifting their reflectance peaks by 110 nm up
to 150 nm. Additionally, APBA-functionalized pNIPAm-co-AAc microgels have a depressed volume phase transition temperature at 18–20 °C, which shifts to 24–26 °C after glucose binding.
We also demonstrate that these materials show a marked visual color change, which is a first step towards developing direct
read-out sensor devices. |
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