Crown-Ether Derived Graphene Hybrid Composite for Membrane-Free Potentiometric Sensing of Alkali Metal Ions

Gunnar Olsen, Jens Ulstrup, Qijin Chi

Research output: Contribution to journalLetterResearchpeer-review

Abstract

We report the design and synthesis of newly functionalized graphene hybrid material that can be used for selective membrane-free potentiometric detection of alkali metal ions, represented by potassium ions. Reduced graphene oxide (RGO) functionalized covalently by 18-crown[6] ether with a dense surface coverage is achieved by the introduction of a flexible linking molecule. The resulting hybrid composite is highly stable and is capable of detecting potassium ions down to micromolar ranges with a selectivity over other cations (including Ca2+, Li+, Na+, NH4+) at concentrations up to 25 mM. This material can be combined further with disposable chips, demonstrating its promise as an effective ion-selective sensing component for practical applications.
Original languageEnglish
JournalA C S Applied Materials and Interfaces
Volume8
Issue number1
Pages (from-to)37-41
Number of pages5
ISSN1944-8244
DOIs
Publication statusPublished - 2016

Keywords

  • Chemical sensor
  • Crown ether
  • Disposable electrode
  • Hybrid material
  • Potassium ions
  • Reduced graphene oxide

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