Sensors (Apr 2018)

Micro-Capillary Coatings Based on Spiropyran Polymeric Brushes for Metal Ion Binding, Detection, and Release in Continuous Flow

  • Aishling Dunne,
  • Colm Delaney,
  • Aoife McKeon,
  • Pavel Nesterenko,
  • Brett Paull,
  • Fernando Benito-Lopez,
  • Dermot Diamond,
  • Larisa Florea

DOI
https://doi.org/10.3390/s18041083
Journal volume & issue
Vol. 18, no. 4
p. 1083

Abstract

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Micro-capillaries, capable of light-regulated binding and qualitative detection of divalent metal ions in continuous flow, have been realised through functionalisation with spiropyran photochromic brush-type coatings. Upon irradiation with UV light, the coating switches from the passive non-binding spiropyran form to the active merocyanine form, which binds different divalent metal ions (Zn2+, Co2+, Cu2+, Ni2+, Cd2+), as they pass through the micro-capillary. Furthermore, the merocyanine visible absorbance spectrum changes upon metal ion binding, enabling the ion uptake to be detected optically. Irradiation with white light causes reversion of the merocyanine to the passive spiropyran form, with simultaneous release of the bound metal ion from the micro-capillary coating.

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