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Cu(II)‐Based MOF Immobilized on Multiwalled Carbon Nanotubes: Synthesis and Application for Nonenzymatic Detection of Hydrogen Peroxide with High Sensitivity
Author(s) -
Zhou Echeng,
Zhang Yanwu,
Li Yijun,
He Xiwen
Publication year - 2014
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.201400341
Subject(s) - hydrogen peroxide , redox , x ray photoelectron spectroscopy , electrochemistry , carbon nanotube , detection limit , scanning electron microscope , materials science , biosensor , glassy carbon , electrocatalyst , electrode , electrochemical gas sensor , inorganic chemistry , nuclear chemistry , chemistry , chemical engineering , cyclic voltammetry , nanotechnology , organic chemistry , chromatography , engineering , composite material
Abstract Cu(II)‐based MOF (Cu‐bipy‐BTC, bipy=2,2′‐bipyridine, BTC=1,3,5‐tricarboxylate) was synthesized and immobilized on multiwalled carbon nanotubes. The prepared composite was characterized by scanning electron microscopy (SEM), X‐ray diffraction (XRD), X‐ray photoelectron spectra (XPS) and IR spectra. Then the material was modified onto the surface of a glassy carbon electrode, and showed a couple of well‐defined redox peaks in a phosphate buffer solution (pH 6.0), ascribed to the redox process of Cu II/I in the Cu‐bipy‐BTC. The modified electrode was then applied to fabricate a non‐enzymatic hydrogen peroxide biosensor. The sensor showed good electrocatalytic activity toward the reduction of hydrogen peroxide with a wide linear range (3–70 µmol L −1 and 70–30000 µmol L −1 ) and a detection limit of 0.46 µmol L −1 , as well as good stability and repeatability. In addition, the sensor has been successfully applied to determine hydrogen peroxide in water samples with good accuracy. Thus, the Cu‐bipy‐BTC/MWCNTs composite has great potential for applications in electrochemical sensors.