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

Xianfeng Zhou, Fengyu Su, Yanqing Tian, Roger H. Johnson, Deirdre Meldrum

Research output: Contribution to journalArticle

25 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)135-141
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume159
Issue number1
DOIs
StatePublished - Nov 28 2011

Keywords

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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