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An All‐solid‐state Polymeric Membrane Ca 2+ ‐selective Electrode Based on Hydrophobic Alkyl‐chain‐functionalized Graphene Oxide
Author(s) -
Yin Tanji,
Li Jinghui,
Qin Wei
Publication year - 2017
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201600383
Subject(s) - graphene , membrane , ionophore , electrode , materials science , oxide , chemical engineering , inorganic chemistry , chemistry , nanotechnology , biochemistry , engineering , metallurgy
An all‐solid‐state polymeric membrane Ca 2+ ‐selective electrode based on hydrophobic octadecylamine‐functionalized graphene oxide has been developed. The hydrophobic composite in the ion‐selective membrane not only acts as a transduction element to improve the potential stability for the all‐solid‐state Ca 2+ ‐selective electrode, but also is used to immobilize Ca 2+ ionophore with lipophilic side chains through hydrophobic interactions. The developed all‐solid‐state Ca 2+ ‐selective electrode shows a stable potential response in the linear range of 3.0×10 −7 –1.0×10 −3 M with a slope of 24.7±0.3 mV/dec, and the detection limit is (1.6±0.2 )×10 −7 M ( n =3). Additionally, due to the hydrophobicity and electrical conductivity of the composite, the proposed all‐solid‐state ion‐selective electrode exhibits an improved stability with the absence of water layer between the ion‐selective membrane and the underlying glassy carbon electrode. This work provides a simple, efficient and low‐cost methodology for developing stable and robust all‐solid‐state ion‐selective electrode with ionophore immobilization.