Platinum (II) porphyrin-containing thermoresponsive poly(N- isopropylacrylamide) copolymer as fluorescence dual oxygen and temperature sensor

  • Zhou X
  • Su F
  • Tian Y
 et al. 
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Abstract

A random copolymer, poly(NIPAAm-co-PtPorphyrin), consisting of N-isopropylacrylamide (NIPAAm) and platinum (II) porphyrin units, behaves as an optical dual sensor for oxygen and temperature. The dual sensor is designed by incorporating an oxygen-sensitive platinum (II) porphyrin (M1) into a temperature-sensitive polymer (PNIPAAm). The polymer exhibited low critical solution temperature (LCST) property at 31.5 °C. This LCST affected the polymer's aggregation status, which in turn affected the nanostructures, fluorescence intensities, and responses to dissolved oxygen. This enables the polymer to functionalize as a dual temperature and dissolved oxygen sensor. Oxygen response of the platinum (II) porphyrin probes in the polymer followed a two-site Stern-Volmer model, indicating the nonuniform distribution of the probes. The copolymer was used to preliminarily monitor the oxygen consumption of Escherichia coli (E. coli) bacteria. The results indicate a potential application of the polymer in biological fields. © 2011 Elsevier B.V.

Author-supplied keywords

  • Dual optical sensor
  • Oxygen sensor
  • Platinum porphyrin
  • Poly(N-isopropylacrylamide)
  • Temperature sensor

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