ACS Appl Mater Interfaces. 2016 Jan 13;8(1):37-41. doi: 10.1021/acsami.5b11597. Epub 2015 Dec 29.

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

ACS applied materials & interfaces

Gunnar Olsen, Jens Ulstrup, Qijin Chi

PMID: 26703780 DOI: 10.1021/acsami.5b11597

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 Ca(2+), 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.

Keywords: chemical sensor; crown ether; disposable electrode; hybrid material; potassium ions; reduced graphene oxide

Publication Types

• Journal Article
• Research Support, Non-U.S. Gov't